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gcc/libstdc++-v3/include/bits/basic_string.h
Paolo Carlini cc6e67d442 basic_string.tcc (_M_mutate): Do not reallocate unnecessarily when _M_rep() == &_S_empty_rep() and __new_size... 
2004-10-18  Paolo Carlini  <pcarlini@suse.de>

	* include/bits/basic_string.tcc (_M_mutate): Do not reallocate
	unnecessarily when _M_rep() == &_S_empty_rep() and __new_size
	== capacity() (== 0): is ok to just leave everything unchanged.

	* include/bits/basic_string.h: Minor formatting fixes.
	* include/bits/basic_string.tcc: Likewise.

From-SVN: r89199
2004-10-18 08:43:17 +00:00

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// Components for manipulating sequences of characters -*- C++ -*-
// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004
// Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 2, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING. If not, write to the Free
// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// USA.
// As a special exception, you may use this file as part of a free software
// library without restriction. Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License. This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.
//
// ISO C++ 14882: 21 Strings library
//
/** @file basic_string.h
* This is an internal header file, included by other library headers.
* You should not attempt to use it directly.
*/
#ifndef _BASIC_STRING_H
#define _BASIC_STRING_H 1
#pragma GCC system_header
#include <bits/atomicity.h>
#include <debug/debug.h>
namespace std
{
/**
* @class basic_string basic_string.h <string>
* @brief Managing sequences of characters and character-like objects.
*
* @ingroup Containers
* @ingroup Sequences
*
* Meets the requirements of a <a href="tables.html#65">container</a>, a
* <a href="tables.html#66">reversible container</a>, and a
* <a href="tables.html#67">sequence</a>. Of the
* <a href="tables.html#68">optional sequence requirements</a>, only
* @c push_back, @c at, and array access are supported.
*
* @doctodo
*
*
* @if maint
* Documentation? What's that?
* Nathan Myers <ncm@cantrip.org>.
*
* A string looks like this:
*
* @code
* [_Rep]
* _M_length
* [basic_string<char_type>] _M_capacity
* _M_dataplus _M_refcount
* _M_p ----------------> unnamed array of char_type
* @endcode
*
* Where the _M_p points to the first character in the string, and
* you cast it to a pointer-to-_Rep and subtract 1 to get a
* pointer to the header.
*
* This approach has the enormous advantage that a string object
* requires only one allocation. All the ugliness is confined
* within a single pair of inline functions, which each compile to
* a single "add" instruction: _Rep::_M_data(), and
* string::_M_rep(); and the allocation function which gets a
* block of raw bytes and with room enough and constructs a _Rep
* object at the front.
*
* The reason you want _M_data pointing to the character array and
* not the _Rep is so that the debugger can see the string
* contents. (Probably we should add a non-inline member to get
* the _Rep for the debugger to use, so users can check the actual
* string length.)
*
* Note that the _Rep object is a POD so that you can have a
* static "empty string" _Rep object already "constructed" before
* static constructors have run. The reference-count encoding is
* chosen so that a 0 indicates one reference, so you never try to
* destroy the empty-string _Rep object.
*
* All but the last paragraph is considered pretty conventional
* for a C++ string implementation.
* @endif
*/
// 21.3 Template class basic_string
template<typename _CharT, typename _Traits, typename _Alloc>
class basic_string
{
// Types:
public:
typedef _Traits traits_type;
typedef typename _Traits::char_type value_type;
typedef _Alloc allocator_type;
typedef typename _Alloc::size_type size_type;
typedef typename _Alloc::difference_type difference_type;
typedef typename _Alloc::reference reference;
typedef typename _Alloc::const_reference const_reference;
typedef typename _Alloc::pointer pointer;
typedef typename _Alloc::const_pointer const_pointer;
typedef __gnu_cxx::__normal_iterator<pointer, basic_string> iterator;
typedef __gnu_cxx::__normal_iterator<const_pointer, basic_string>
const_iterator;
typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
typedef std::reverse_iterator<iterator> reverse_iterator;
private:
// _Rep: string representation
// Invariants:
// 1. String really contains _M_length + 1 characters: due to 21.3.4
// must be kept null-terminated.
// 2. _M_capacity >= _M_length
// Allocated memory is always (_M_capacity + 1) * sizeof(_CharT).
// 3. _M_refcount has three states:
// -1: leaked, one reference, no ref-copies allowed, non-const.
// 0: one reference, non-const.
// n>0: n + 1 references, operations require a lock, const.
// 4. All fields==0 is an empty string, given the extra storage
// beyond-the-end for a null terminator; thus, the shared
// empty string representation needs no constructor.
struct _Rep_base
{
size_type _M_length;
size_type _M_capacity;
_Atomic_word _M_refcount;
};
struct _Rep : _Rep_base
{
// Types:
typedef typename _Alloc::template rebind<char>::other _Raw_bytes_alloc;
// (Public) Data members:
// The maximum number of individual char_type elements of an
// individual string is determined by _S_max_size. This is the
// value that will be returned by max_size(). (Whereas npos
// is the maximum number of bytes the allocator can allocate.)
// If one was to divvy up the theoretical largest size string,
// with a terminating character and m _CharT elements, it'd
// look like this:
// npos = sizeof(_Rep) + (m * sizeof(_CharT)) + sizeof(_CharT)
// Solving for m:
// m = ((npos - sizeof(_Rep))/sizeof(CharT)) - 1
// In addition, this implementation quarters this amount.
static const size_type _S_max_size;
static const _CharT _S_terminal;
// The following storage is init'd to 0 by the linker, resulting
// (carefully) in an empty string with one reference.
static size_type _S_empty_rep_storage[];
static _Rep&
_S_empty_rep()
{ return *reinterpret_cast<_Rep*>(&_S_empty_rep_storage); }
bool
_M_is_leaked() const
{ return this->_M_refcount < 0; }
bool
_M_is_shared() const
{ return this->_M_refcount > 0; }
void
_M_set_leaked()
{ this->_M_refcount = -1; }
void
_M_set_sharable()
{ this->_M_refcount = 0; }
_CharT*
_M_refdata() throw()
{ return reinterpret_cast<_CharT*>(this + 1); }
_CharT*
_M_grab(const _Alloc& __alloc1, const _Alloc& __alloc2)
{
return (!_M_is_leaked() && __alloc1 == __alloc2)
? _M_refcopy() : _M_clone(__alloc1);
}
// Create & Destroy
static _Rep*
_S_create(size_type, size_type, const _Alloc&);
void
_M_dispose(const _Alloc& __a)
{
#ifndef _GLIBCXX_FULLY_DYNAMIC_STRING
if (__builtin_expect(this != &_S_empty_rep(), false))
#endif
if (__gnu_cxx::__exchange_and_add(&this->_M_refcount, -1) <= 0)
_M_destroy(__a);
} // XXX MT
void
_M_destroy(const _Alloc&) throw();
_CharT*
_M_refcopy() throw()
{
#ifndef _GLIBCXX_FULLY_DYNAMIC_STRING
if (__builtin_expect(this != &_S_empty_rep(), false))
#endif
__gnu_cxx::__atomic_add(&this->_M_refcount, 1);
return _M_refdata();
} // XXX MT
_CharT*
_M_clone(const _Alloc&, size_type __res = 0);
};
// Use empty-base optimization: http://www.cantrip.org/emptyopt.html
struct _Alloc_hider : _Alloc
{
_Alloc_hider(_CharT* __dat, const _Alloc& __a)
: _Alloc(__a), _M_p(__dat) { }
_CharT* _M_p; // The actual data.
};
public:
// Data Members (public):
// NB: This is an unsigned type, and thus represents the maximum
// size that the allocator can hold.
/// @var
/// Value returned by various member functions when they fail.
static const size_type npos = static_cast<size_type>(-1);
private:
// Data Members (private):
mutable _Alloc_hider _M_dataplus;
_CharT*
_M_data() const
{ return _M_dataplus._M_p; }
_CharT*
_M_data(_CharT* __p)
{ return (_M_dataplus._M_p = __p); }
_Rep*
_M_rep() const
{ return &((reinterpret_cast<_Rep*> (_M_data()))[-1]); }
// For the internal use we have functions similar to `begin'/`end'
// but they do not call _M_leak.
iterator
_M_ibegin() const
{ return iterator(_M_data()); }
iterator
_M_iend() const
{ return iterator(_M_data() + this->size()); }
void
_M_leak() // for use in begin() & non-const op[]
{
if (!_M_rep()->_M_is_leaked())
_M_leak_hard();
}
size_type
_M_check(size_type __pos, const char* __s) const
{
if (__pos > this->size())
__throw_out_of_range(__N(__s));
return __pos;
}
// NB: _M_limit doesn't check for a bad __pos value.
size_type
_M_limit(size_type __pos, size_type __off) const
{
const bool __testoff = __off < this->size() - __pos;
return __testoff ? __off : this->size() - __pos;
}
// _S_copy_chars is a separate template to permit specialization
// to optimize for the common case of pointers as iterators.
template<class _Iterator>
static void
_S_copy_chars(_CharT* __p, _Iterator __k1, _Iterator __k2)
{
for (; __k1 != __k2; ++__k1, ++__p)
traits_type::assign(*__p, *__k1); // These types are off.
}
static void
_S_copy_chars(_CharT* __p, iterator __k1, iterator __k2)
{ _S_copy_chars(__p, __k1.base(), __k2.base()); }
static void
_S_copy_chars(_CharT* __p, const_iterator __k1, const_iterator __k2)
{ _S_copy_chars(__p, __k1.base(), __k2.base()); }
static void
_S_copy_chars(_CharT* __p, _CharT* __k1, _CharT* __k2)
{ traits_type::copy(__p, __k1, __k2 - __k1); }
static void
_S_copy_chars(_CharT* __p, const _CharT* __k1, const _CharT* __k2)
{ traits_type::copy(__p, __k1, __k2 - __k1); }
void
_M_mutate(size_type __pos, size_type __len1, size_type __len2);
void
_M_leak_hard();
static _Rep&
_S_empty_rep()
{ return _Rep::_S_empty_rep(); }
public:
// Construct/copy/destroy:
// NB: We overload ctors in some cases instead of using default
// arguments, per 17.4.4.4 para. 2 item 2.
/**
* @brief Default constructor creates an empty string.
*/
inline
basic_string();
/**
* @brief Construct an empty string using allocator a.
*/
explicit
basic_string(const _Alloc& __a);
// NB: per LWG issue 42, semantics different from IS:
/**
* @brief Construct string with copy of value of @a str.
* @param str Source string.
*/
basic_string(const basic_string& __str);
/**
* @brief Construct string as copy of a substring.
* @param str Source string.
* @param pos Index of first character to copy from.
* @param n Number of characters to copy (default remainder).
*/
basic_string(const basic_string& __str, size_type __pos,
size_type __n = npos);
/**
* @brief Construct string as copy of a substring.
* @param str Source string.
* @param pos Index of first character to copy from.
* @param n Number of characters to copy.
* @param a Allocator to use.
*/
basic_string(const basic_string& __str, size_type __pos,
size_type __n, const _Alloc& __a);
/**
* @brief Construct string initialized by a character array.
* @param s Source character array.
* @param n Number of characters to copy.
* @param a Allocator to use (default is default allocator).
*
* NB: s must have at least n characters, '\0' has no special
* meaning.
*/
basic_string(const _CharT* __s, size_type __n,
const _Alloc& __a = _Alloc());
/**
* @brief Construct string as copy of a C string.
* @param s Source C string.
* @param a Allocator to use (default is default allocator).
*/
basic_string(const _CharT* __s, const _Alloc& __a = _Alloc());
/**
* @brief Construct string as multiple characters.
* @param n Number of characters.
* @param c Character to use.
* @param a Allocator to use (default is default allocator).
*/
basic_string(size_type __n, _CharT __c, const _Alloc& __a = _Alloc());
/**
* @brief Construct string as copy of a range.
* @param beg Start of range.
* @param end End of range.
* @param a Allocator to use (default is default allocator).
*/
template<class _InputIterator>
basic_string(_InputIterator __beg, _InputIterator __end,
const _Alloc& __a = _Alloc());
/**
* @brief Destroy the string instance.
*/
~basic_string()
{ _M_rep()->_M_dispose(this->get_allocator()); }
/**
* @brief Assign the value of @a str to this string.
* @param str Source string.
*/
basic_string&
operator=(const basic_string& __str)
{ return this->assign(__str); }
/**
* @brief Copy contents of @a s into this string.
* @param s Source null-terminated string.
*/
basic_string&
operator=(const _CharT* __s)
{ return this->assign(__s); }
/**
* @brief Set value to string of length 1.
* @param c Source character.
*
* Assigning to a character makes this string length 1 and
* (*this)[0] == @a c.
*/
basic_string&
operator=(_CharT __c)
{
this->assign(1, __c);
return *this;
}
// Iterators:
/**
* Returns a read/write iterator that points to the first character in
* the %string. Unshares the string.
*/
iterator
begin()
{
_M_leak();
return iterator(_M_data());
}
/**
* Returns a read-only (constant) iterator that points to the first
* character in the %string.
*/
const_iterator
begin() const
{ return const_iterator(_M_data()); }
/**
* Returns a read/write iterator that points one past the last
* character in the %string. Unshares the string.
*/
iterator
end()
{
_M_leak();
return iterator(_M_data() + this->size());
}
/**
* Returns a read-only (constant) iterator that points one past the
* last character in the %string.
*/
const_iterator
end() const
{ return const_iterator(_M_data() + this->size()); }
/**
* Returns a read/write reverse iterator that points to the last
* character in the %string. Iteration is done in reverse element
* order. Unshares the string.
*/
reverse_iterator
rbegin()
{ return reverse_iterator(this->end()); }
/**
* Returns a read-only (constant) reverse iterator that points
* to the last character in the %string. Iteration is done in
* reverse element order.
*/
const_reverse_iterator
rbegin() const
{ return const_reverse_iterator(this->end()); }
/**
* Returns a read/write reverse iterator that points to one before the
* first character in the %string. Iteration is done in reverse
* element order. Unshares the string.
*/
reverse_iterator
rend()
{ return reverse_iterator(this->begin()); }
/**
* Returns a read-only (constant) reverse iterator that points
* to one before the first character in the %string. Iteration
* is done in reverse element order.
*/
const_reverse_iterator
rend() const
{ return const_reverse_iterator(this->begin()); }
public:
// Capacity:
/// Returns the number of characters in the string, not including any
/// null-termination.
size_type
size() const
{ return _M_rep()->_M_length; }
/// Returns the number of characters in the string, not including any
/// null-termination.
size_type
length() const
{ return _M_rep()->_M_length; }
/// Returns the size() of the largest possible %string.
size_type
max_size() const
{ return _Rep::_S_max_size; }
/**
* @brief Resizes the %string to the specified number of characters.
* @param n Number of characters the %string should contain.
* @param c Character to fill any new elements.
*
* This function will %resize the %string to the specified
* number of characters. If the number is smaller than the
* %string's current size the %string is truncated, otherwise
* the %string is extended and new elements are set to @a c.
*/
void
resize(size_type __n, _CharT __c);
/**
* @brief Resizes the %string to the specified number of characters.
* @param n Number of characters the %string should contain.
*
* This function will resize the %string to the specified length. If
* the new size is smaller than the %string's current size the %string
* is truncated, otherwise the %string is extended and new characters
* are default-constructed. For basic types such as char, this means
* setting them to 0.
*/
void
resize(size_type __n)
{ this->resize(__n, _CharT()); }
/**
* Returns the total number of characters that the %string can hold
* before needing to allocate more memory.
*/
size_type
capacity() const
{ return _M_rep()->_M_capacity; }
/**
* @brief Attempt to preallocate enough memory for specified number of
* characters.
* @param n Number of characters required.
* @throw std::length_error If @a n exceeds @c max_size().
*
* This function attempts to reserve enough memory for the
* %string to hold the specified number of characters. If the
* number requested is more than max_size(), length_error is
* thrown.
*
* The advantage of this function is that if optimal code is a
* necessity and the user can determine the string length that will be
* required, the user can reserve the memory in %advance, and thus
* prevent a possible reallocation of memory and copying of %string
* data.
*/
void
reserve(size_type __res_arg = 0);
/**
* Erases the string, making it empty.
*/
void
clear()
{ _M_mutate(0, this->size(), 0); }
/**
* Returns true if the %string is empty. Equivalent to *this == "".
*/
bool
empty() const
{ return this->size() == 0; }
// Element access:
/**
* @brief Subscript access to the data contained in the %string.
* @param n The index of the character to access.
* @return Read-only (constant) reference to the character.
*
* This operator allows for easy, array-style, data access.
* Note that data access with this operator is unchecked and
* out_of_range lookups are not defined. (For checked lookups
* see at().)
*/
const_reference
operator[] (size_type __pos) const
{
_GLIBCXX_DEBUG_ASSERT(__pos <= size());
return _M_data()[__pos];
}
/**
* @brief Subscript access to the data contained in the %string.
* @param n The index of the character to access.
* @return Read/write reference to the character.
*
* This operator allows for easy, array-style, data access.
* Note that data access with this operator is unchecked and
* out_of_range lookups are not defined. (For checked lookups
* see at().) Unshares the string.
*/
reference
operator[](size_type __pos)
{
_GLIBCXX_DEBUG_ASSERT(__pos < size());
_M_leak();
return _M_data()[__pos];
}
/**
* @brief Provides access to the data contained in the %string.
* @param n The index of the character to access.
* @return Read-only (const) reference to the character.
* @throw std::out_of_range If @a n is an invalid index.
*
* This function provides for safer data access. The parameter is
* first checked that it is in the range of the string. The function
* throws out_of_range if the check fails.
*/
const_reference
at(size_type __n) const
{
if (__n >= this->size())
__throw_out_of_range(__N("basic_string::at"));
return _M_data()[__n];
}
/**
* @brief Provides access to the data contained in the %string.
* @param n The index of the character to access.
* @return Read/write reference to the character.
* @throw std::out_of_range If @a n is an invalid index.
*
* This function provides for safer data access. The parameter is
* first checked that it is in the range of the string. The function
* throws out_of_range if the check fails. Success results in
* unsharing the string.
*/
reference
at(size_type __n)
{
if (__n >= size())
__throw_out_of_range(__N("basic_string::at"));
_M_leak();
return _M_data()[__n];
}
// Modifiers:
/**
* @brief Append a string to this string.
* @param str The string to append.
* @return Reference to this string.
*/
basic_string&
operator+=(const basic_string& __str)
{ return this->append(__str); }
/**
* @brief Append a C string.
* @param s The C string to append.
* @return Reference to this string.
*/
basic_string&
operator+=(const _CharT* __s)
{ return this->append(__s); }
/**
* @brief Append a character.
* @param s The character to append.
* @return Reference to this string.
*/
basic_string&
operator+=(_CharT __c)
{ return this->append(size_type(1), __c); }
/**
* @brief Append a string to this string.
* @param str The string to append.
* @return Reference to this string.
*/
basic_string&
append(const basic_string& __str);
/**
* @brief Append a substring.
* @param str The string to append.
* @param pos Index of the first character of str to append.
* @param n The number of characters to append.
* @return Reference to this string.
* @throw std::out_of_range if @a pos is not a valid index.
*
* This function appends @a n characters from @a str starting at @a pos
* to this string. If @a n is is larger than the number of available
* characters in @a str, the remainder of @a str is appended.
*/
basic_string&
append(const basic_string& __str, size_type __pos, size_type __n);
/**
* @brief Append a C substring.
* @param s The C string to append.
* @param n The number of characters to append.
* @return Reference to this string.
*/
basic_string&
append(const _CharT* __s, size_type __n);
/**
* @brief Append a C string.
* @param s The C string to append.
* @return Reference to this string.
*/
basic_string&
append(const _CharT* __s)
{
__glibcxx_requires_string(__s);
return this->append(__s, traits_type::length(__s));
}
/**
* @brief Append multiple characters.
* @param n The number of characters to append.
* @param c The character to use.
* @return Reference to this string.
*
* Appends n copies of c to this string.
*/
basic_string&
append(size_type __n, _CharT __c)
{ return _M_replace_aux(this->size(), size_type(0), __n, __c); }
/**
* @brief Append a range of characters.
* @param first Iterator referencing the first character to append.
* @param last Iterator marking the end of the range.
* @return Reference to this string.
*
* Appends characters in the range [first,last) to this string.
*/
template<class _InputIterator>
basic_string&
append(_InputIterator __first, _InputIterator __last)
{ return this->replace(_M_iend(), _M_iend(), __first, __last); }
/**
* @brief Append a single character.
* @param c Character to append.
*/
void
push_back(_CharT __c)
{ _M_replace_aux(this->size(), size_type(0), size_type(1), __c); }
/**
* @brief Set value to contents of another string.
* @param str Source string to use.
* @return Reference to this string.
*/
basic_string&
assign(const basic_string& __str);
/**
* @brief Set value to a substring of a string.
* @param str The string to use.
* @param pos Index of the first character of str.
* @param n Number of characters to use.
* @return Reference to this string.
* @throw std::out_of_range if @a pos is not a valid index.
*
* This function sets this string to the substring of @a str consisting
* of @a n characters at @a pos. If @a n is is larger than the number
* of available characters in @a str, the remainder of @a str is used.
*/
basic_string&
assign(const basic_string& __str, size_type __pos, size_type __n)
{ return this->assign(__str._M_data()
+ __str._M_check(__pos, "basic_string::assign"),
__str._M_limit(__pos, __n)); }
/**
* @brief Set value to a C substring.
* @param s The C string to use.
* @param n Number of characters to use.
* @return Reference to this string.
*
* This function sets the value of this string to the first @a n
* characters of @a s. If @a n is is larger than the number of
* available characters in @a s, the remainder of @a s is used.
*/
basic_string&
assign(const _CharT* __s, size_type __n);
/**
* @brief Set value to contents of a C string.
* @param s The C string to use.
* @return Reference to this string.
*
* This function sets the value of this string to the value of @a s.
* The data is copied, so there is no dependence on @a s once the
* function returns.
*/
basic_string&
assign(const _CharT* __s)
{
__glibcxx_requires_string(__s);
return this->assign(__s, traits_type::length(__s));
}
/**
* @brief Set value to multiple characters.
* @param n Length of the resulting string.
* @param c The character to use.
* @return Reference to this string.
*
* This function sets the value of this string to @a n copies of
* character @a c.
*/
basic_string&
assign(size_type __n, _CharT __c)
{ return _M_replace_aux(size_type(0), this->size(), __n, __c); }
/**
* @brief Set value to a range of characters.
* @param first Iterator referencing the first character to append.
* @param last Iterator marking the end of the range.
* @return Reference to this string.
*
* Sets value of string to characters in the range [first,last).
*/
template<class _InputIterator>
basic_string&
assign(_InputIterator __first, _InputIterator __last)
{ return this->replace(_M_ibegin(), _M_iend(), __first, __last); }
/**
* @brief Insert multiple characters.
* @param p Iterator referencing location in string to insert at.
* @param n Number of characters to insert
* @param c The character to insert.
* @throw std::length_error If new length exceeds @c max_size().
*
* Inserts @a n copies of character @a c starting at the position
* referenced by iterator @a p. If adding characters causes the length
* to exceed max_size(), length_error is thrown. The value of the
* string doesn't change if an error is thrown.
*/
void
insert(iterator __p, size_type __n, _CharT __c)
{ this->replace(__p, __p, __n, __c); }
/**
* @brief Insert a range of characters.
* @param p Iterator referencing location in string to insert at.
* @param beg Start of range.
* @param end End of range.
* @throw std::length_error If new length exceeds @c max_size().
*
* Inserts characters in range [beg,end). If adding characters causes
* the length to exceed max_size(), length_error is thrown. The value
* of the string doesn't change if an error is thrown.
*/
template<class _InputIterator>
void insert(iterator __p, _InputIterator __beg, _InputIterator __end)
{ this->replace(__p, __p, __beg, __end); }
/**
* @brief Insert value of a string.
* @param pos1 Iterator referencing location in string to insert at.
* @param str The string to insert.
* @return Reference to this string.
* @throw std::length_error If new length exceeds @c max_size().
*
* Inserts value of @a str starting at @a pos1. If adding characters
* causes the length to exceed max_size(), length_error is thrown. The
* value of the string doesn't change if an error is thrown.
*/
basic_string&
insert(size_type __pos1, const basic_string& __str)
{ return this->insert(__pos1, __str, size_type(0), __str.size()); }
/**
* @brief Insert a substring.
* @param pos1 Iterator referencing location in string to insert at.
* @param str The string to insert.
* @param pos2 Start of characters in str to insert.
* @param n Number of characters to insert.
* @return Reference to this string.
* @throw std::length_error If new length exceeds @c max_size().
* @throw std::out_of_range If @a pos1 > size() or
* @a pos2 > @a str.size().
*
* Starting at @a pos1, insert @a n character of @a str beginning with
* @a pos2. If adding characters causes the length to exceed
* max_size(), length_error is thrown. If @a pos1 is beyond the end of
* this string or @a pos2 is beyond the end of @a str, out_of_range is
* thrown. The value of the string doesn't change if an error is
* thrown.
*/
basic_string&
insert(size_type __pos1, const basic_string& __str,
size_type __pos2, size_type __n)
{ return this->insert(__pos1, __str._M_data()
+ __str._M_check(__pos2, "basic_string::insert"),
__str._M_limit(__pos2, __n)); }
/**
* @brief Insert a C substring.
* @param pos Iterator referencing location in string to insert at.
* @param s The C string to insert.
* @param n The number of characters to insert.
* @return Reference to this string.
* @throw std::length_error If new length exceeds @c max_size().
* @throw std::out_of_range If @a pos is beyond the end of this
* string.
*
* Inserts the first @a n characters of @a s starting at @a pos. If
* adding characters causes the length to exceed max_size(),
* length_error is thrown. If @a pos is beyond end(), out_of_range is
* thrown. The value of the string doesn't change if an error is
* thrown.
*/
basic_string&
insert(size_type __pos, const _CharT* __s, size_type __n);
/**
* @brief Insert a C string.
* @param pos Iterator referencing location in string to insert at.
* @param s The C string to insert.
* @return Reference to this string.
* @throw std::length_error If new length exceeds @c max_size().
* @throw std::out_of_range If @a pos is beyond the end of this
* string.
*
* Inserts the first @a n characters of @a s starting at @a pos. If
* adding characters causes the length to exceed max_size(),
* length_error is thrown. If @a pos is beyond end(), out_of_range is
* thrown. The value of the string doesn't change if an error is
* thrown.
*/
basic_string&
insert(size_type __pos, const _CharT* __s)
{
__glibcxx_requires_string(__s);
return this->insert(__pos, __s, traits_type::length(__s));
}
/**
* @brief Insert multiple characters.
* @param pos Index in string to insert at.
* @param n Number of characters to insert
* @param c The character to insert.
* @return Reference to this string.
* @throw std::length_error If new length exceeds @c max_size().
* @throw std::out_of_range If @a pos is beyond the end of this
* string.
*
* Inserts @a n copies of character @a c starting at index @a pos. If
* adding characters causes the length to exceed max_size(),
* length_error is thrown. If @a pos > length(), out_of_range is
* thrown. The value of the string doesn't change if an error is
* thrown.
*/
basic_string&
insert(size_type __pos, size_type __n, _CharT __c)
{ return _M_replace_aux(_M_check(__pos, "basic_string::insert"),
size_type(0), __n, __c); }
/**
* @brief Insert one character.
* @param p Iterator referencing position in string to insert at.
* @param c The character to insert.
* @return Iterator referencing newly inserted char.
* @throw std::length_error If new length exceeds @c max_size().
*
* Inserts character @a c at position referenced by @a p. If adding
* character causes the length to exceed max_size(), length_error is
* thrown. If @a p is beyond end of string, out_of_range is thrown.
* The value of the string doesn't change if an error is thrown.
*/
iterator
insert(iterator __p, _CharT __c)
{
_GLIBCXX_DEBUG_PEDASSERT(__p >= _M_ibegin() && __p <= _M_iend());
const size_type __pos = __p - _M_ibegin();
_M_replace_aux(__pos, size_type(0), size_type(1), __c);
_M_rep()->_M_set_leaked();
return this->_M_ibegin() + __pos;
}
/**
* @brief Remove characters.
* @param pos Index of first character to remove (default 0).
* @param n Number of characters to remove (default remainder).
* @return Reference to this string.
* @throw std::out_of_range If @a pos is beyond the end of this
* string.
*
* Removes @a n characters from this string starting at @a pos. The
* length of the string is reduced by @a n. If there are < @a n
* characters to remove, the remainder of the string is truncated. If
* @a p is beyond end of string, out_of_range is thrown. The value of
* the string doesn't change if an error is thrown.
*/
basic_string&
erase(size_type __pos = 0, size_type __n = npos)
{ return _M_replace_safe(_M_check(__pos, "basic_string::erase"),
_M_limit(__pos, __n), NULL, size_type(0)); }
/**
* @brief Remove one character.
* @param position Iterator referencing the character to remove.
* @return iterator referencing same location after removal.
*
* Removes the character at @a position from this string. The value
* of the string doesn't change if an error is thrown.
*/
iterator
erase(iterator __position)
{
_GLIBCXX_DEBUG_PEDASSERT(__position >= _M_ibegin()
&& __position < _M_iend());
const size_type __pos = __position - _M_ibegin();
_M_replace_safe(__pos, size_type(1), NULL, size_type(0));
_M_rep()->_M_set_leaked();
return _M_ibegin() + __pos;
}
/**
* @brief Remove a range of characters.
* @param first Iterator referencing the first character to remove.
* @param last Iterator referencing the end of the range.
* @return Iterator referencing location of first after removal.
*
* Removes the characters in the range [first,last) from this string.
* The value of the string doesn't change if an error is thrown.
*/
iterator
erase(iterator __first, iterator __last)
{
_GLIBCXX_DEBUG_PEDASSERT(__first >= _M_ibegin() && __first <= __last
&& __last <= _M_iend());
const size_type __pos = __first - _M_ibegin();
_M_replace_safe(__pos, __last - __first, NULL, size_type(0));
_M_rep()->_M_set_leaked();
return _M_ibegin() + __pos;
}
/**
* @brief Replace characters with value from another string.
* @param pos Index of first character to replace.
* @param n Number of characters to be replaced.
* @param str String to insert.
* @return Reference to this string.
* @throw std::out_of_range If @a pos is beyond the end of this
* string.
* @throw std::length_error If new length exceeds @c max_size().
*
* Removes the characters in the range [pos,pos+n) from this string.
* In place, the value of @a str is inserted. If @a pos is beyond end
* of string, out_of_range is thrown. If the length of the result
* exceeds max_size(), length_error is thrown. The value of the string
* doesn't change if an error is thrown.
*/
basic_string&
replace(size_type __pos, size_type __n, const basic_string& __str)
{ return this->replace(__pos, __n, __str._M_data(), __str.size()); }
/**
* @brief Replace characters with value from another string.
* @param pos1 Index of first character to replace.
* @param n1 Number of characters to be replaced.
* @param str String to insert.
* @param pos2 Index of first character of str to use.
* @param n2 Number of characters from str to use.
* @return Reference to this string.
* @throw std::out_of_range If @a pos1 > size() or @a pos2 >
* str.size().
* @throw std::length_error If new length exceeds @c max_size().
*
* Removes the characters in the range [pos1,pos1 + n) from this
* string. In place, the value of @a str is inserted. If @a pos is
* beyond end of string, out_of_range is thrown. If the length of the
* result exceeds max_size(), length_error is thrown. The value of the
* string doesn't change if an error is thrown.
*/
basic_string&
replace(size_type __pos1, size_type __n1, const basic_string& __str,
size_type __pos2, size_type __n2)
{ return this->replace(__pos1, __n1, __str._M_data()
+ __str._M_check(__pos2, "basic_string::replace"),
__str._M_limit(__pos2, __n2)); }
/**
* @brief Replace characters with value of a C substring.
* @param pos Index of first character to replace.
* @param n1 Number of characters to be replaced.
* @param str C string to insert.
* @param n2 Number of characters from str to use.
* @return Reference to this string.
* @throw std::out_of_range If @a pos1 > size().
* @throw std::length_error If new length exceeds @c max_size().
*
* Removes the characters in the range [pos,pos + n1) from this string.
* In place, the first @a n2 characters of @a str are inserted, or all
* of @a str if @a n2 is too large. If @a pos is beyond end of string,
* out_of_range is thrown. If the length of result exceeds max_size(),
* length_error is thrown. The value of the string doesn't change if
* an error is thrown.
*/
basic_string&
replace(size_type __pos, size_type __n1, const _CharT* __s,
size_type __n2);
/**
* @brief Replace characters with value of a C string.
* @param pos Index of first character to replace.
* @param n1 Number of characters to be replaced.
* @param str C string to insert.
* @return Reference to this string.
* @throw std::out_of_range If @a pos > size().
* @throw std::length_error If new length exceeds @c max_size().
*
* Removes the characters in the range [pos,pos + n1) from this string.
* In place, the first @a n characters of @a str are inserted. If @a
* pos is beyond end of string, out_of_range is thrown. If the length
* of result exceeds max_size(), length_error is thrown. The value of
* the string doesn't change if an error is thrown.
*/
basic_string&
replace(size_type __pos, size_type __n1, const _CharT* __s)
{
__glibcxx_requires_string(__s);
return this->replace(__pos, __n1, __s, traits_type::length(__s));
}
/**
* @brief Replace characters with multiple characters.
* @param pos Index of first character to replace.
* @param n1 Number of characters to be replaced.
* @param n2 Number of characters to insert.
* @param c Character to insert.
* @return Reference to this string.
* @throw std::out_of_range If @a pos > size().
* @throw std::length_error If new length exceeds @c max_size().
*
* Removes the characters in the range [pos,pos + n1) from this string.
* In place, @a n2 copies of @a c are inserted. If @a pos is beyond
* end of string, out_of_range is thrown. If the length of result
* exceeds max_size(), length_error is thrown. The value of the string
* doesn't change if an error is thrown.
*/
basic_string&
replace(size_type __pos, size_type __n1, size_type __n2, _CharT __c)
{ return _M_replace_aux(_M_check(__pos, "basic_string::replace"),
_M_limit(__pos, __n1), __n2, __c); }
/**
* @brief Replace range of characters with string.
* @param i1 Iterator referencing start of range to replace.
* @param i2 Iterator referencing end of range to replace.
* @param str String value to insert.
* @return Reference to this string.
* @throw std::length_error If new length exceeds @c max_size().
*
* Removes the characters in the range [i1,i2). In place, the value of
* @a str is inserted. If the length of result exceeds max_size(),
* length_error is thrown. The value of the string doesn't change if
* an error is thrown.
*/
basic_string&
replace(iterator __i1, iterator __i2, const basic_string& __str)
{ return this->replace(__i1, __i2, __str._M_data(), __str.size()); }
/**
* @brief Replace range of characters with C substring.
* @param i1 Iterator referencing start of range to replace.
* @param i2 Iterator referencing end of range to replace.
* @param s C string value to insert.
* @param n Number of characters from s to insert.
* @return Reference to this string.
* @throw std::length_error If new length exceeds @c max_size().
*
* Removes the characters in the range [i1,i2). In place, the first @a
* n characters of @a s are inserted. If the length of result exceeds
* max_size(), length_error is thrown. The value of the string doesn't
* change if an error is thrown.
*/
basic_string&
replace(iterator __i1, iterator __i2, const _CharT* __s, size_type __n)
{
_GLIBCXX_DEBUG_PEDASSERT(_M_ibegin() <= __i1 && __i1 <= __i2
&& __i2 <= _M_iend());
return this->replace(__i1 - _M_ibegin(), __i2 - __i1, __s, __n);
}
/**
* @brief Replace range of characters with C string.
* @param i1 Iterator referencing start of range to replace.
* @param i2 Iterator referencing end of range to replace.
* @param s C string value to insert.
* @return Reference to this string.
* @throw std::length_error If new length exceeds @c max_size().
*
* Removes the characters in the range [i1,i2). In place, the
* characters of @a s are inserted. If the length of result exceeds
* max_size(), length_error is thrown. The value of the string doesn't
* change if an error is thrown.
*/
basic_string&
replace(iterator __i1, iterator __i2, const _CharT* __s)
{
__glibcxx_requires_string(__s);
return this->replace(__i1, __i2, __s, traits_type::length(__s));
}
/**
* @brief Replace range of characters with multiple characters
* @param i1 Iterator referencing start of range to replace.
* @param i2 Iterator referencing end of range to replace.
* @param n Number of characters to insert.
* @param c Character to insert.
* @return Reference to this string.
* @throw std::length_error If new length exceeds @c max_size().
*
* Removes the characters in the range [i1,i2). In place, @a n copies
* of @a c are inserted. If the length of result exceeds max_size(),
* length_error is thrown. The value of the string doesn't change if
* an error is thrown.
*/
basic_string&
replace(iterator __i1, iterator __i2, size_type __n, _CharT __c)
{
_GLIBCXX_DEBUG_PEDASSERT(_M_ibegin() <= __i1 && __i1 <= __i2
&& __i2 <= _M_iend());
return _M_replace_aux(__i1 - _M_ibegin(), __i2 - __i1, __n, __c);
}
/**
* @brief Replace range of characters with range.
* @param i1 Iterator referencing start of range to replace.
* @param i2 Iterator referencing end of range to replace.
* @param k1 Iterator referencing start of range to insert.
* @param k2 Iterator referencing end of range to insert.
* @return Reference to this string.
* @throw std::length_error If new length exceeds @c max_size().
*
* Removes the characters in the range [i1,i2). In place, characters
* in the range [k1,k2) are inserted. If the length of result exceeds
* max_size(), length_error is thrown. The value of the string doesn't
* change if an error is thrown.
*/
template<class _InputIterator>
basic_string&
replace(iterator __i1, iterator __i2,
_InputIterator __k1, _InputIterator __k2)
{
_GLIBCXX_DEBUG_PEDASSERT(_M_ibegin() <= __i1 && __i1 <= __i2
&& __i2 <= _M_iend());
__glibcxx_requires_valid_range(__k1, __k2);
typedef typename _Is_integer<_InputIterator>::_Integral _Integral;
return _M_replace_dispatch(__i1, __i2, __k1, __k2, _Integral());
}
// Specializations for the common case of pointer and iterator:
// useful to avoid the overhead of temporary buffering in _M_replace.
basic_string&
replace(iterator __i1, iterator __i2, _CharT* __k1, _CharT* __k2)
{
_GLIBCXX_DEBUG_PEDASSERT(_M_ibegin() <= __i1 && __i1 <= __i2
&& __i2 <= _M_iend());
__glibcxx_requires_valid_range(__k1, __k2);
return this->replace(__i1 - _M_ibegin(), __i2 - __i1,
__k1, __k2 - __k1);
}
basic_string&
replace(iterator __i1, iterator __i2,
const _CharT* __k1, const _CharT* __k2)
{
_GLIBCXX_DEBUG_PEDASSERT(_M_ibegin() <= __i1 && __i1 <= __i2
&& __i2 <= _M_iend());
__glibcxx_requires_valid_range(__k1, __k2);
return this->replace(__i1 - _M_ibegin(), __i2 - __i1,
__k1, __k2 - __k1);
}
basic_string&
replace(iterator __i1, iterator __i2, iterator __k1, iterator __k2)
{
_GLIBCXX_DEBUG_PEDASSERT(_M_ibegin() <= __i1 && __i1 <= __i2
&& __i2 <= _M_iend());
__glibcxx_requires_valid_range(__k1, __k2);
return this->replace(__i1 - _M_ibegin(), __i2 - __i1,
__k1.base(), __k2 - __k1);
}
basic_string&
replace(iterator __i1, iterator __i2,
const_iterator __k1, const_iterator __k2)
{
_GLIBCXX_DEBUG_PEDASSERT(_M_ibegin() <= __i1 && __i1 <= __i2
&& __i2 <= _M_iend());
__glibcxx_requires_valid_range(__k1, __k2);
return this->replace(__i1 - _M_ibegin(), __i2 - __i1,
__k1.base(), __k2 - __k1);
}
private:
template<class _Integer>
basic_string&
_M_replace_dispatch(iterator __i1, iterator __i2, _Integer __n,
_Integer __val, __true_type)
{ return _M_replace_aux(__i1 - _M_ibegin(), __i2 - __i1, __n, __val); }
template<class _InputIterator>
basic_string&
_M_replace_dispatch(iterator __i1, iterator __i2, _InputIterator __k1,
_InputIterator __k2, __false_type);
basic_string&
_M_replace_aux(size_type __pos1, size_type __n1, size_type __n2,
_CharT __c)
{
if (this->max_size() - (this->size() - __n1) < __n2)
__throw_length_error(__N("basic_string::_M_replace_aux"));
_M_mutate(__pos1, __n1, __n2);
if (__n2 == 1)
_M_data()[__pos1] = __c;
else if (__n2)
traits_type::assign(_M_data() + __pos1, __n2, __c);
return *this;
}
basic_string&
_M_replace_safe(size_type __pos1, size_type __n1, const _CharT* __s,
size_type __n2)
{
_M_mutate(__pos1, __n1, __n2);
if (__n2 == 1)
_M_data()[__pos1] = *__s;
else if (__n2)
traits_type::copy(_M_data() + __pos1, __s, __n2);
return *this;
}
// _S_construct_aux is used to implement the 21.3.1 para 15 which
// requires special behaviour if _InIter is an integral type
template<class _InIterator>
static _CharT*
_S_construct_aux(_InIterator __beg, _InIterator __end,
const _Alloc& __a, __false_type)
{
typedef typename iterator_traits<_InIterator>::iterator_category _Tag;
return _S_construct(__beg, __end, __a, _Tag());
}
template<class _InIterator>
static _CharT*
_S_construct_aux(_InIterator __beg, _InIterator __end,
const _Alloc& __a, __true_type)
{ return _S_construct(static_cast<size_type>(__beg),
static_cast<value_type>(__end), __a); }
template<class _InIterator>
static _CharT*
_S_construct(_InIterator __beg, _InIterator __end, const _Alloc& __a)
{
typedef typename _Is_integer<_InIterator>::_Integral _Integral;
return _S_construct_aux(__beg, __end, __a, _Integral());
}
// For Input Iterators, used in istreambuf_iterators, etc.
template<class _InIterator>
static _CharT*
_S_construct(_InIterator __beg, _InIterator __end, const _Alloc& __a,
input_iterator_tag);
// For forward_iterators up to random_access_iterators, used for
// string::iterator, _CharT*, etc.
template<class _FwdIterator>
static _CharT*
_S_construct(_FwdIterator __beg, _FwdIterator __end, const _Alloc& __a,
forward_iterator_tag);
static _CharT*
_S_construct(size_type __req, _CharT __c, const _Alloc& __a);
public:
/**
* @brief Copy substring into C string.
* @param s C string to copy value into.
* @param n Number of characters to copy.
* @param pos Index of first character to copy.
* @return Number of characters actually copied
* @throw std::out_of_range If pos > size().
*
* Copies up to @a n characters starting at @a pos into the C string @a
* s. If @a pos is greater than size(), out_of_range is thrown.
*/
size_type
copy(_CharT* __s, size_type __n, size_type __pos = 0) const;
/**
* @brief Swap contents with another string.
* @param s String to swap with.
*
* Exchanges the contents of this string with that of @a s in constant
* time.
*/
void
swap(basic_string& __s);
// String operations:
/**
* @brief Return const pointer to null-terminated contents.
*
* This is a handle to internal data. Do not modify or dire things may
* happen.
*/
const _CharT*
c_str() const
{ return _M_data(); }
/**
* @brief Return const pointer to contents.
*
* This is a handle to internal data. Do not modify or dire things may
* happen.
*/
const _CharT*
data() const
{ return _M_data(); }
/**
* @brief Return copy of allocator used to construct this string.
*/
allocator_type
get_allocator() const
{ return _M_dataplus; }
/**
* @brief Find position of a C substring.
* @param s C string to locate.
* @param pos Index of character to search from.
* @param n Number of characters from @a s to search for.
* @return Index of start of first occurrence.
*
* Starting from @a pos, searches forward for the first @a n characters
* in @a s within this string. If found, returns the index where it
* begins. If not found, returns npos.
*/
size_type
find(const _CharT* __s, size_type __pos, size_type __n) const;
/**
* @brief Find position of a string.
* @param str String to locate.
* @param pos Index of character to search from (default 0).
* @return Index of start of first occurrence.
*
* Starting from @a pos, searches forward for value of @a str within
* this string. If found, returns the index where it begins. If not
* found, returns npos.
*/
size_type
find(const basic_string& __str, size_type __pos = 0) const
{ return this->find(__str.data(), __pos, __str.size()); }
/**
* @brief Find position of a C string.
* @param s C string to locate.
* @param pos Index of character to search from (default 0).
* @return Index of start of first occurrence.
*
* Starting from @a pos, searches forward for the value of @a s within
* this string. If found, returns the index where it begins. If not
* found, returns npos.
*/
size_type
find(const _CharT* __s, size_type __pos = 0) const
{
__glibcxx_requires_string(__s);
return this->find(__s, __pos, traits_type::length(__s));
}
/**
* @brief Find position of a character.
* @param c Character to locate.
* @param pos Index of character to search from (default 0).
* @return Index of first occurrence.
*
* Starting from @a pos, searches forward for @a c within this string.
* If found, returns the index where it was found. If not found,
* returns npos.
*/
size_type
find(_CharT __c, size_type __pos = 0) const;
/**
* @brief Find last position of a string.
* @param str String to locate.
* @param pos Index of character to search back from (default end).
* @return Index of start of last occurrence.
*
* Starting from @a pos, searches backward for value of @a str within
* this string. If found, returns the index where it begins. If not
* found, returns npos.
*/
size_type
rfind(const basic_string& __str, size_type __pos = npos) const
{ return this->rfind(__str.data(), __pos, __str.size()); }
/**
* @brief Find last position of a C substring.
* @param s C string to locate.
* @param pos Index of character to search back from.
* @param n Number of characters from s to search for.
* @return Index of start of last occurrence.
*
* Starting from @a pos, searches backward for the first @a n
* characters in @a s within this string. If found, returns the index
* where it begins. If not found, returns npos.
*/
size_type
rfind(const _CharT* __s, size_type __pos, size_type __n) const;
/**
* @brief Find last position of a C string.
* @param s C string to locate.
* @param pos Index of character to start search at (default 0).
* @return Index of start of last occurrence.
*
* Starting from @a pos, searches backward for the value of @a s within
* this string. If found, returns the index where it begins. If not
* found, returns npos.
*/
size_type
rfind(const _CharT* __s, size_type __pos = npos) const
{
__glibcxx_requires_string(__s);
return this->rfind(__s, __pos, traits_type::length(__s));
}
/**
* @brief Find last position of a character.
* @param c Character to locate.
* @param pos Index of character to search back from (default 0).
* @return Index of last occurrence.
*
* Starting from @a pos, searches backward for @a c within this string.
* If found, returns the index where it was found. If not found,
* returns npos.
*/
size_type
rfind(_CharT __c, size_type __pos = npos) const;
/**
* @brief Find position of a character of string.
* @param str String containing characters to locate.
* @param pos Index of character to search from (default 0).
* @return Index of first occurrence.
*
* Starting from @a pos, searches forward for one of the characters of
* @a str within this string. If found, returns the index where it was
* found. If not found, returns npos.
*/
size_type
find_first_of(const basic_string& __str, size_type __pos = 0) const
{ return this->find_first_of(__str.data(), __pos, __str.size()); }
/**
* @brief Find position of a character of C substring.
* @param s String containing characters to locate.
* @param pos Index of character to search from (default 0).
* @param n Number of characters from s to search for.
* @return Index of first occurrence.
*
* Starting from @a pos, searches forward for one of the first @a n
* characters of @a s within this string. If found, returns the index
* where it was found. If not found, returns npos.
*/
size_type
find_first_of(const _CharT* __s, size_type __pos, size_type __n) const;
/**
* @brief Find position of a character of C string.
* @param s String containing characters to locate.
* @param pos Index of character to search from (default 0).
* @return Index of first occurrence.
*
* Starting from @a pos, searches forward for one of the characters of
* @a s within this string. If found, returns the index where it was
* found. If not found, returns npos.
*/
size_type
find_first_of(const _CharT* __s, size_type __pos = 0) const
{
__glibcxx_requires_string(__s);
return this->find_first_of(__s, __pos, traits_type::length(__s));
}
/**
* @brief Find position of a character.
* @param c Character to locate.
* @param pos Index of character to search from (default 0).
* @return Index of first occurrence.
*
* Starting from @a pos, searches forward for the character @a c within
* this string. If found, returns the index where it was found. If
* not found, returns npos.
*
* Note: equivalent to find(c, pos).
*/
size_type
find_first_of(_CharT __c, size_type __pos = 0) const
{ return this->find(__c, __pos); }
/**
* @brief Find last position of a character of string.
* @param str String containing characters to locate.
* @param pos Index of character to search back from (default end).
* @return Index of last occurrence.
*
* Starting from @a pos, searches backward for one of the characters of
* @a str within this string. If found, returns the index where it was
* found. If not found, returns npos.
*/
size_type
find_last_of(const basic_string& __str, size_type __pos = npos) const
{ return this->find_last_of(__str.data(), __pos, __str.size()); }
/**
* @brief Find last position of a character of C substring.
* @param s C string containing characters to locate.
* @param pos Index of character to search back from (default end).
* @param n Number of characters from s to search for.
* @return Index of last occurrence.
*
* Starting from @a pos, searches backward for one of the first @a n
* characters of @a s within this string. If found, returns the index
* where it was found. If not found, returns npos.
*/
size_type
find_last_of(const _CharT* __s, size_type __pos, size_type __n) const;
/**
* @brief Find last position of a character of C string.
* @param s C string containing characters to locate.
* @param pos Index of character to search back from (default end).
* @return Index of last occurrence.
*
* Starting from @a pos, searches backward for one of the characters of
* @a s within this string. If found, returns the index where it was
* found. If not found, returns npos.
*/
size_type
find_last_of(const _CharT* __s, size_type __pos = npos) const
{
__glibcxx_requires_string(__s);
return this->find_last_of(__s, __pos, traits_type::length(__s));
}
/**
* @brief Find last position of a character.
* @param c Character to locate.
* @param pos Index of character to search back from (default 0).
* @return Index of last occurrence.
*
* Starting from @a pos, searches backward for @a c within this string.
* If found, returns the index where it was found. If not found,
* returns npos.
*
* Note: equivalent to rfind(c, pos).
*/
size_type
find_last_of(_CharT __c, size_type __pos = npos) const
{ return this->rfind(__c, __pos); }
/**
* @brief Find position of a character not in string.
* @param str String containing characters to avoid.
* @param pos Index of character to search from (default 0).
* @return Index of first occurrence.
*
* Starting from @a pos, searches forward for a character not contained
* in @a str within this string. If found, returns the index where it
* was found. If not found, returns npos.
*/
size_type
find_first_not_of(const basic_string& __str, size_type __pos = 0) const
{ return this->find_first_not_of(__str.data(), __pos, __str.size()); }
/**
* @brief Find position of a character not in C substring.
* @param s C string containing characters to avoid.
* @param pos Index of character to search from (default 0).
* @param n Number of characters from s to consider.
* @return Index of first occurrence.
*
* Starting from @a pos, searches forward for a character not contained
* in the first @a n characters of @a s within this string. If found,
* returns the index where it was found. If not found, returns npos.
*/
size_type
find_first_not_of(const _CharT* __s, size_type __pos,
size_type __n) const;
/**
* @brief Find position of a character not in C string.
* @param s C string containing characters to avoid.
* @param pos Index of character to search from (default 0).
* @return Index of first occurrence.
*
* Starting from @a pos, searches forward for a character not contained
* in @a s within this string. If found, returns the index where it
* was found. If not found, returns npos.
*/
size_type
find_first_not_of(const _CharT* __s, size_type __pos = 0) const
{
__glibcxx_requires_string(__s);
return this->find_first_not_of(__s, __pos, traits_type::length(__s));
}
/**
* @brief Find position of a different character.
* @param c Character to avoid.
* @param pos Index of character to search from (default 0).
* @return Index of first occurrence.
*
* Starting from @a pos, searches forward for a character other than @a c
* within this string. If found, returns the index where it was found.
* If not found, returns npos.
*/
size_type
find_first_not_of(_CharT __c, size_type __pos = 0) const;
/**
* @brief Find last position of a character not in string.
* @param str String containing characters to avoid.
* @param pos Index of character to search from (default 0).
* @return Index of first occurrence.
*
* Starting from @a pos, searches backward for a character not
* contained in @a str within this string. If found, returns the index
* where it was found. If not found, returns npos.
*/
size_type
find_last_not_of(const basic_string& __str, size_type __pos = npos) const
{ return this->find_last_not_of(__str.data(), __pos, __str.size()); }
/**
* @brief Find last position of a character not in C substring.
* @param s C string containing characters to avoid.
* @param pos Index of character to search from (default 0).
* @param n Number of characters from s to consider.
* @return Index of first occurrence.
*
* Starting from @a pos, searches backward for a character not
* contained in the first @a n characters of @a s within this string.
* If found, returns the index where it was found. If not found,
* returns npos.
*/
size_type
find_last_not_of(const _CharT* __s, size_type __pos,
size_type __n) const;
/**
* @brief Find position of a character not in C string.
* @param s C string containing characters to avoid.
* @param pos Index of character to search from (default 0).
* @return Index of first occurrence.
*
* Starting from @a pos, searches backward for a character not
* contained in @a s within this string. If found, returns the index
* where it was found. If not found, returns npos.
*/
size_type
find_last_not_of(const _CharT* __s, size_type __pos = npos) const
{
__glibcxx_requires_string(__s);
return this->find_last_not_of(__s, __pos, traits_type::length(__s));
}
/**
* @brief Find last position of a different character.
* @param c Character to avoid.
* @param pos Index of character to search from (default 0).
* @return Index of first occurrence.
*
* Starting from @a pos, searches backward for a character other than
* @a c within this string. If found, returns the index where it was
* found. If not found, returns npos.
*/
size_type
find_last_not_of(_CharT __c, size_type __pos = npos) const;
/**
* @brief Get a substring.
* @param pos Index of first character (default 0).
* @param n Number of characters in substring (default remainder).
* @return The new string.
* @throw std::out_of_range If pos > size().
*
* Construct and return a new string using the @a n characters starting
* at @a pos. If the string is too short, use the remainder of the
* characters. If @a pos is beyond the end of the string, out_of_range
* is thrown.
*/
basic_string
substr(size_type __pos = 0, size_type __n = npos) const
{ return basic_string(*this,
_M_check(__pos, "basic_string::substr"), __n); }
/**
* @brief Compare to a string.
* @param str String to compare against.
* @return Integer < 0, 0, or > 0.
*
* Returns an integer < 0 if this string is ordered before @a str, 0 if
* their values are equivalent, or > 0 if this string is ordered after
* @a str. If the lengths of @a str and this string are different, the
* shorter one is ordered first. If they are the same, returns the
* result of traits::compare(data(),str.data(),size());
*/
int
compare(const basic_string& __str) const
{
const size_type __size = this->size();
const size_type __osize = __str.size();
const size_type __len = std::min(__size, __osize);
int __r = traits_type::compare(_M_data(), __str.data(), __len);
if (!__r)
__r = __size - __osize;
return __r;
}
/**
* @brief Compare substring to a string.
* @param pos Index of first character of substring.
* @param n Number of characters in substring.
* @param str String to compare against.
* @return Integer < 0, 0, or > 0.
*
* Form the substring of this string from the @a n characters starting
* at @a pos. Returns an integer < 0 if the substring is ordered
* before @a str, 0 if their values are equivalent, or > 0 if the
* substring is ordered after @a str. If the lengths @a of str and the
* substring are different, the shorter one is ordered first. If they
* are the same, returns the result of
* traits::compare(substring.data(),str.data(),size());
*/
int
compare(size_type __pos, size_type __n, const basic_string& __str) const;
/**
* @brief Compare substring to a substring.
* @param pos1 Index of first character of substring.
* @param n1 Number of characters in substring.
* @param str String to compare against.
* @param pos2 Index of first character of substring of str.
* @param n2 Number of characters in substring of str.
* @return Integer < 0, 0, or > 0.
*
* Form the substring of this string from the @a n1 characters starting
* at @a pos1. Form the substring of @a str from the @a n2 characters
* starting at @a pos2. Returns an integer < 0 if this substring is
* ordered before the substring of @a str, 0 if their values are
* equivalent, or > 0 if this substring is ordered after the substring
* of @a str. If the lengths of the substring of @a str and this
* substring are different, the shorter one is ordered first. If they
* are the same, returns the result of
* traits::compare(substring.data(),str.substr(pos2,n2).data(),size());
*/
int
compare(size_type __pos1, size_type __n1, const basic_string& __str,
size_type __pos2, size_type __n2) const;
/**
* @brief Compare to a C string.
* @param s C string to compare against.
* @return Integer < 0, 0, or > 0.
*
* Returns an integer < 0 if this string is ordered before @a s, 0 if
* their values are equivalent, or > 0 if this string is ordered after
* @a s. If the lengths of @a s and this string are different, the
* shorter one is ordered first. If they are the same, returns the
* result of traits::compare(data(),s,size());
*/
int
compare(const _CharT* __s) const;
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 5 String::compare specification questionable
/**
* @brief Compare substring to a C string.
* @param pos Index of first character of substring.
* @param n1 Number of characters in substring.
* @param s C string to compare against.
* @return Integer < 0, 0, or > 0.
*
* Form the substring of this string from the @a n1 characters starting
* at @a pos. Returns an integer < 0 if the substring is ordered
* before @a s, 0 if their values are equivalent, or > 0 if the
* substring is ordered after @a s. If the lengths of @a s and the
* substring are different, the shorter one is ordered first. If they
* are the same, returns the result of
* traits::compare(substring.data(),s,size());
*/
int
compare(size_type __pos, size_type __n1, const _CharT* __s) const;
/**
* @brief Compare substring against a character array.
* @param pos1 Index of first character of substring.
* @param n1 Number of characters in substring.
* @param s character array to compare against.
* @param n2 Number of characters of s.
* @return Integer < 0, 0, or > 0.
*
* Form the substring of this string from the @a n1 characters starting
* at @a pos1. Form a string from the first @a n2 characters of @a s.
* Returns an integer < 0 if this substring is ordered before the string
* from @a s, 0 if their values are equivalent, or > 0 if this substring
* is ordered after the string from @a s. If the lengths of this
* substring and @a n2 are different, the shorter one is ordered first.
* If they are the same, returns the result of
* traits::compare(substring.data(),s,size());
*
* NB: s must have at least n2 characters, '\0' has no special
* meaning.
*/
int
compare(size_type __pos, size_type __n1, const _CharT* __s,
size_type __n2) const;
};
template<typename _CharT, typename _Traits, typename _Alloc>
inline basic_string<_CharT, _Traits, _Alloc>::
basic_string()
#ifndef _GLIBCXX_FULLY_DYNAMIC_STRING
: _M_dataplus(_S_empty_rep()._M_refdata(), _Alloc()) { }
#else
: _M_dataplus(_S_construct(size_type(), _CharT(), _Alloc()), _Alloc()) { }
#endif
// operator+
/**
* @brief Concatenate two strings.
* @param lhs First string.
* @param rhs Last string.
* @return New string with value of @a lhs followed by @a rhs.
*/
template<typename _CharT, typename _Traits, typename _Alloc>
basic_string<_CharT, _Traits, _Alloc>
operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
const basic_string<_CharT, _Traits, _Alloc>& __rhs)
{
basic_string<_CharT, _Traits, _Alloc> __str(__lhs);
__str.append(__rhs);
return __str;
}
/**
* @brief Concatenate C string and string.
* @param lhs First string.
* @param rhs Last string.
* @return New string with value of @a lhs followed by @a rhs.
*/
template<typename _CharT, typename _Traits, typename _Alloc>
basic_string<_CharT,_Traits,_Alloc>
operator+(const _CharT* __lhs,
const basic_string<_CharT,_Traits,_Alloc>& __rhs);
/**
* @brief Concatenate character and string.
* @param lhs First string.
* @param rhs Last string.
* @return New string with @a lhs followed by @a rhs.
*/
template<typename _CharT, typename _Traits, typename _Alloc>
basic_string<_CharT,_Traits,_Alloc>
operator+(_CharT __lhs, const basic_string<_CharT,_Traits,_Alloc>& __rhs);
/**
* @brief Concatenate string and C string.
* @param lhs First string.
* @param rhs Last string.
* @return New string with @a lhs followed by @a rhs.
*/
template<typename _CharT, typename _Traits, typename _Alloc>
inline basic_string<_CharT, _Traits, _Alloc>
operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
const _CharT* __rhs)
{
basic_string<_CharT, _Traits, _Alloc> __str(__lhs);
__str.append(__rhs);
return __str;
}
/**
* @brief Concatenate string and character.
* @param lhs First string.
* @param rhs Last string.
* @return New string with @a lhs followed by @a rhs.
*/
template<typename _CharT, typename _Traits, typename _Alloc>
inline basic_string<_CharT, _Traits, _Alloc>
operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs, _CharT __rhs)
{
typedef basic_string<_CharT, _Traits, _Alloc> __string_type;
typedef typename __string_type::size_type __size_type;
__string_type __str(__lhs);
__str.append(__size_type(1), __rhs);
return __str;
}
// operator ==
/**
* @brief Test equivalence of two strings.
* @param lhs First string.
* @param rhs Second string.
* @return True if @a lhs.compare(@a rhs) == 0. False otherwise.
*/
template<typename _CharT, typename _Traits, typename _Alloc>
inline bool
operator==(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
const basic_string<_CharT, _Traits, _Alloc>& __rhs)
{ return __lhs.compare(__rhs) == 0; }
/**
* @brief Test equivalence of C string and string.
* @param lhs C string.
* @param rhs String.
* @return True if @a rhs.compare(@a lhs) == 0. False otherwise.
*/
template<typename _CharT, typename _Traits, typename _Alloc>
inline bool
operator==(const _CharT* __lhs,
const basic_string<_CharT, _Traits, _Alloc>& __rhs)
{ return __rhs.compare(__lhs) == 0; }
/**
* @brief Test equivalence of string and C string.
* @param lhs String.
* @param rhs C string.
* @return True if @a lhs.compare(@a rhs) == 0. False otherwise.
*/
template<typename _CharT, typename _Traits, typename _Alloc>
inline bool
operator==(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
const _CharT* __rhs)
{ return __lhs.compare(__rhs) == 0; }
// operator !=
/**
* @brief Test difference of two strings.
* @param lhs First string.
* @param rhs Second string.
* @return True if @a lhs.compare(@a rhs) != 0. False otherwise.
*/
template<typename _CharT, typename _Traits, typename _Alloc>
inline bool
operator!=(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
const basic_string<_CharT, _Traits, _Alloc>& __rhs)
{ return __rhs.compare(__lhs) != 0; }
/**
* @brief Test difference of C string and string.
* @param lhs C string.
* @param rhs String.
* @return True if @a rhs.compare(@a lhs) != 0. False otherwise.
*/
template<typename _CharT, typename _Traits, typename _Alloc>
inline bool
operator!=(const _CharT* __lhs,
const basic_string<_CharT, _Traits, _Alloc>& __rhs)
{ return __rhs.compare(__lhs) != 0; }
/**
* @brief Test difference of string and C string.
* @param lhs String.
* @param rhs C string.
* @return True if @a lhs.compare(@a rhs) != 0. False otherwise.
*/
template<typename _CharT, typename _Traits, typename _Alloc>
inline bool
operator!=(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
const _CharT* __rhs)
{ return __lhs.compare(__rhs) != 0; }
// operator <
/**
* @brief Test if string precedes string.
* @param lhs First string.
* @param rhs Second string.
* @return True if @a lhs precedes @a rhs. False otherwise.
*/
template<typename _CharT, typename _Traits, typename _Alloc>
inline bool
operator<(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
const basic_string<_CharT, _Traits, _Alloc>& __rhs)
{ return __lhs.compare(__rhs) < 0; }
/**
* @brief Test if string precedes C string.
* @param lhs String.
* @param rhs C string.
* @return True if @a lhs precedes @a rhs. False otherwise.
*/
template<typename _CharT, typename _Traits, typename _Alloc>
inline bool
operator<(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
const _CharT* __rhs)
{ return __lhs.compare(__rhs) < 0; }
/**
* @brief Test if C string precedes string.
* @param lhs C string.
* @param rhs String.
* @return True if @a lhs precedes @a rhs. False otherwise.
*/
template<typename _CharT, typename _Traits, typename _Alloc>
inline bool
operator<(const _CharT* __lhs,
const basic_string<_CharT, _Traits, _Alloc>& __rhs)
{ return __rhs.compare(__lhs) > 0; }
// operator >
/**
* @brief Test if string follows string.
* @param lhs First string.
* @param rhs Second string.
* @return True if @a lhs follows @a rhs. False otherwise.
*/
template<typename _CharT, typename _Traits, typename _Alloc>
inline bool
operator>(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
const basic_string<_CharT, _Traits, _Alloc>& __rhs)
{ return __lhs.compare(__rhs) > 0; }
/**
* @brief Test if string follows C string.
* @param lhs String.
* @param rhs C string.
* @return True if @a lhs follows @a rhs. False otherwise.
*/
template<typename _CharT, typename _Traits, typename _Alloc>
inline bool
operator>(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
const _CharT* __rhs)
{ return __lhs.compare(__rhs) > 0; }
/**
* @brief Test if C string follows string.
* @param lhs C string.
* @param rhs String.
* @return True if @a lhs follows @a rhs. False otherwise.
*/
template<typename _CharT, typename _Traits, typename _Alloc>
inline bool
operator>(const _CharT* __lhs,
const basic_string<_CharT, _Traits, _Alloc>& __rhs)
{ return __rhs.compare(__lhs) < 0; }
// operator <=
/**
* @brief Test if string doesn't follow string.
* @param lhs First string.
* @param rhs Second string.
* @return True if @a lhs doesn't follow @a rhs. False otherwise.
*/
template<typename _CharT, typename _Traits, typename _Alloc>
inline bool
operator<=(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
const basic_string<_CharT, _Traits, _Alloc>& __rhs)
{ return __lhs.compare(__rhs) <= 0; }
/**
* @brief Test if string doesn't follow C string.
* @param lhs String.
* @param rhs C string.
* @return True if @a lhs doesn't follow @a rhs. False otherwise.
*/
template<typename _CharT, typename _Traits, typename _Alloc>
inline bool
operator<=(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
const _CharT* __rhs)
{ return __lhs.compare(__rhs) <= 0; }
/**
* @brief Test if C string doesn't follow string.
* @param lhs C string.
* @param rhs String.
* @return True if @a lhs doesn't follow @a rhs. False otherwise.
*/
template<typename _CharT, typename _Traits, typename _Alloc>
inline bool
operator<=(const _CharT* __lhs,
const basic_string<_CharT, _Traits, _Alloc>& __rhs)
{ return __rhs.compare(__lhs) >= 0; }
// operator >=
/**
* @brief Test if string doesn't precede string.
* @param lhs First string.
* @param rhs Second string.
* @return True if @a lhs doesn't precede @a rhs. False otherwise.
*/
template<typename _CharT, typename _Traits, typename _Alloc>
inline bool
operator>=(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
const basic_string<_CharT, _Traits, _Alloc>& __rhs)
{ return __lhs.compare(__rhs) >= 0; }
/**
* @brief Test if string doesn't precede C string.
* @param lhs String.
* @param rhs C string.
* @return True if @a lhs doesn't precede @a rhs. False otherwise.
*/
template<typename _CharT, typename _Traits, typename _Alloc>
inline bool
operator>=(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
const _CharT* __rhs)
{ return __lhs.compare(__rhs) >= 0; }
/**
* @brief Test if C string doesn't precede string.
* @param lhs C string.
* @param rhs String.
* @return True if @a lhs doesn't precede @a rhs. False otherwise.
*/
template<typename _CharT, typename _Traits, typename _Alloc>
inline bool
operator>=(const _CharT* __lhs,
const basic_string<_CharT, _Traits, _Alloc>& __rhs)
{ return __rhs.compare(__lhs) <= 0; }
/**
* @brief Swap contents of two strings.
* @param lhs First string.
* @param rhs Second string.
*
* Exchanges the contents of @a lhs and @a rhs in constant time.
*/
template<typename _CharT, typename _Traits, typename _Alloc>
inline void
swap(basic_string<_CharT, _Traits, _Alloc>& __lhs,
basic_string<_CharT, _Traits, _Alloc>& __rhs)
{ __lhs.swap(__rhs); }
/**
* @brief Read stream into a string.
* @param is Input stream.
* @param str Buffer to store into.
* @return Reference to the input stream.
*
* Stores characters from @a is into @a str until whitespace is found, the
* end of the stream is encountered, or str.max_size() is reached. If
* is.width() is non-zero, that is the limit on the number of characters
* stored into @a str. Any previous contents of @a str are erased.
*/
template<typename _CharT, typename _Traits, typename _Alloc>
basic_istream<_CharT, _Traits>&
operator>>(basic_istream<_CharT, _Traits>& __is,
basic_string<_CharT, _Traits, _Alloc>& __str);
/**
* @brief Write string to a stream.
* @param os Output stream.
* @param str String to write out.
* @return Reference to the output stream.
*
* Output characters of @a str into os following the same rules as for
* writing a C string.
*/
template<typename _CharT, typename _Traits, typename _Alloc>
basic_ostream<_CharT, _Traits>&
operator<<(basic_ostream<_CharT, _Traits>& __os,
const basic_string<_CharT, _Traits, _Alloc>& __str);
/**
* @brief Read a line from stream into a string.
* @param is Input stream.
* @param str Buffer to store into.
* @param delim Character marking end of line.
* @return Reference to the input stream.
*
* Stores characters from @a is into @a str until @a delim is found, the
* end of the stream is encountered, or str.max_size() is reached. If
* is.width() is non-zero, that is the limit on the number of characters
* stored into @a str. Any previous contents of @a str are erased. If @a
* delim was encountered, it is extracted but not stored into @a str.
*/
template<typename _CharT, typename _Traits, typename _Alloc>
basic_istream<_CharT,_Traits>&
getline(basic_istream<_CharT, _Traits>& __is,
basic_string<_CharT, _Traits, _Alloc>& __str, _CharT __delim);
/**
* @brief Read a line from stream into a string.
* @param is Input stream.
* @param str Buffer to store into.
* @return Reference to the input stream.
*
* Stores characters from is into @a str until '\n' is found, the end of
* the stream is encountered, or str.max_size() is reached. If is.width()
* is non-zero, that is the limit on the number of characters stored into
* @a str. Any previous contents of @a str are erased. If end of line was
* encountered, it is extracted but not stored into @a str.
*/
template<typename _CharT, typename _Traits, typename _Alloc>
inline basic_istream<_CharT,_Traits>&
getline(basic_istream<_CharT, _Traits>& __is,
basic_string<_CharT, _Traits, _Alloc>& __str);
} // namespace std
#endif /* _BASIC_STRING_H */
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