c6888c6257
PR libstdc++/79433 * doc/xml/manual/status_cxx2017.xml: Update feature-test macros. * doc/html/*: Regenerate. * include/Makefile.am: Remove <bits/c++17_warning.h>. * include/Makefile.in: Regenerate. * include/bits/c++17_warning.h: Remove. * include/bits/string_view.tcc: Do not include <bits/c++17_warning.h> for pre-C++17 modes. * include/std/any: Likewise. (__cpp_lib_any): Define. * include/std/mutex (__cpp_lib_scoped_lock): Adjust value as per new SD-6 draft. * include/std/numeric (__cpp_lib_gcd_lcm): Define as per new SD-6 draft. * include/std/optional: Do not include <bits/c++17_warning.h>. (__cpp_lib_optional): Define. * include/std/shared_mutex: Do not include <bits/c++14_warning.h>. * include/std/string_view: Do not include <bits/c++17_warning.h>. (__cpp_lib_string_view): Define. * include/std/variant: Do not include <bits/c++17_warning.h>. (__cpp_lib_variant): Define. * testsuite/20_util/optional/cons/value_neg.cc: Adjust dg-error line numbers. * testsuite/26_numerics/gcd/1.cc: Test for __cpp_lib_gcd_lcm. * testsuite/26_numerics/gcd/gcd_neg.cc: Adjust dg-error line numbers. * testsuite/26_numerics/lcm/1.cc: Test for __cpp_lib_gcd_lcm. * testsuite/26_numerics/lcm/lcm_neg.cc: Adjust dg-error line numbers. * testsuite/30_threads/scoped_lock/requirements/typedefs.cc: Adjust expected value of __cpp_lib_scoped_lock. From-SVN: r252018
668 lines
21 KiB
C++
668 lines
21 KiB
C++
// Components for manipulating non-owning sequences of characters -*- C++ -*-
|
|
|
|
// Copyright (C) 2013-2017 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 3, 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.
|
|
|
|
// Under Section 7 of GPL version 3, you are granted additional
|
|
// permissions described in the GCC Runtime Library Exception, version
|
|
// 3.1, as published by the Free Software Foundation.
|
|
|
|
// You should have received a copy of the GNU General Public License and
|
|
// a copy of the GCC Runtime Library Exception along with this program;
|
|
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
|
|
// <http://www.gnu.org/licenses/>.
|
|
|
|
/** @file string_view
|
|
* This is a Standard C++ Library header.
|
|
*/
|
|
|
|
//
|
|
// N3762 basic_string_view library
|
|
//
|
|
|
|
#ifndef _GLIBCXX_STRING_VIEW
|
|
#define _GLIBCXX_STRING_VIEW 1
|
|
|
|
#pragma GCC system_header
|
|
|
|
#if __cplusplus >= 201703L
|
|
|
|
#include <limits>
|
|
#include <iosfwd>
|
|
#include <bits/char_traits.h>
|
|
#include <bits/functional_hash.h>
|
|
#include <bits/range_access.h>
|
|
|
|
namespace std _GLIBCXX_VISIBILITY(default)
|
|
{
|
|
_GLIBCXX_BEGIN_NAMESPACE_VERSION
|
|
|
|
#define __cpp_lib_string_view 201603
|
|
|
|
/**
|
|
* @class basic_string_view <string_view>
|
|
* @brief A non-owning reference to a string.
|
|
*
|
|
* @ingroup strings
|
|
* @ingroup sequences
|
|
*
|
|
* @tparam _CharT Type of character
|
|
* @tparam _Traits Traits for character type, defaults to
|
|
* char_traits<_CharT>.
|
|
*
|
|
* A basic_string_view looks like this:
|
|
*
|
|
* @code
|
|
* _CharT* _M_str
|
|
* size_t _M_len
|
|
* @endcode
|
|
*/
|
|
template<typename _CharT, typename _Traits = std::char_traits<_CharT>>
|
|
class basic_string_view
|
|
{
|
|
public:
|
|
|
|
// types
|
|
using traits_type = _Traits;
|
|
using value_type = _CharT;
|
|
using pointer = const _CharT*;
|
|
using const_pointer = const _CharT*;
|
|
using reference = const _CharT&;
|
|
using const_reference = const _CharT&;
|
|
using const_iterator = const _CharT*;
|
|
using iterator = const_iterator;
|
|
using const_reverse_iterator = std::reverse_iterator<const_iterator>;
|
|
using reverse_iterator = const_reverse_iterator;
|
|
using size_type = size_t;
|
|
using difference_type = ptrdiff_t;
|
|
static constexpr size_type npos = size_type(-1);
|
|
|
|
// [string.view.cons], construct/copy
|
|
|
|
constexpr
|
|
basic_string_view() noexcept
|
|
: _M_len{0}, _M_str{nullptr}
|
|
{ }
|
|
|
|
constexpr basic_string_view(const basic_string_view&) noexcept = default;
|
|
|
|
constexpr basic_string_view(const _CharT* __str)
|
|
: _M_len{__str == nullptr ? 0 : traits_type::length(__str)},
|
|
_M_str{__str}
|
|
{ }
|
|
|
|
constexpr basic_string_view(const _CharT* __str, size_type __len)
|
|
: _M_len{__len},
|
|
_M_str{__str}
|
|
{ }
|
|
|
|
constexpr basic_string_view&
|
|
operator=(const basic_string_view&) noexcept = default;
|
|
|
|
// [string.view.iterators], iterators
|
|
|
|
constexpr const_iterator
|
|
begin() const noexcept
|
|
{ return this->_M_str; }
|
|
|
|
constexpr const_iterator
|
|
end() const noexcept
|
|
{ return this->_M_str + this->_M_len; }
|
|
|
|
constexpr const_iterator
|
|
cbegin() const noexcept
|
|
{ return this->_M_str; }
|
|
|
|
constexpr const_iterator
|
|
cend() const noexcept
|
|
{ return this->_M_str + this->_M_len; }
|
|
|
|
constexpr const_reverse_iterator
|
|
rbegin() const noexcept
|
|
{ return const_reverse_iterator(this->end()); }
|
|
|
|
constexpr const_reverse_iterator
|
|
rend() const noexcept
|
|
{ return const_reverse_iterator(this->begin()); }
|
|
|
|
constexpr const_reverse_iterator
|
|
crbegin() const noexcept
|
|
{ return const_reverse_iterator(this->end()); }
|
|
|
|
constexpr const_reverse_iterator
|
|
crend() const noexcept
|
|
{ return const_reverse_iterator(this->begin()); }
|
|
|
|
// [string.view.capacity], capacity
|
|
|
|
constexpr size_type
|
|
size() const noexcept
|
|
{ return this->_M_len; }
|
|
|
|
constexpr size_type
|
|
length() const noexcept
|
|
{ return _M_len; }
|
|
|
|
constexpr size_type
|
|
max_size() const noexcept
|
|
{
|
|
return (npos - sizeof(size_type) - sizeof(void*))
|
|
/ sizeof(value_type) / 4;
|
|
}
|
|
|
|
constexpr bool
|
|
empty() const noexcept
|
|
{ return this->_M_len == 0; }
|
|
|
|
// [string.view.access], element access
|
|
|
|
constexpr const _CharT&
|
|
operator[](size_type __pos) const noexcept
|
|
{
|
|
// TODO: Assert to restore in a way compatible with the constexpr.
|
|
// __glibcxx_assert(__pos < this->_M_len);
|
|
return *(this->_M_str + __pos);
|
|
}
|
|
|
|
constexpr const _CharT&
|
|
at(size_type __pos) const
|
|
{
|
|
return __pos < this->_M_len
|
|
? *(this->_M_str + __pos)
|
|
: (__throw_out_of_range_fmt(__N("basic_string_view::at: __pos "
|
|
"(which is %zu) >= this->size() "
|
|
"(which is %zu)"),
|
|
__pos, this->size()),
|
|
*this->_M_str);
|
|
}
|
|
|
|
constexpr const _CharT&
|
|
front() const
|
|
{
|
|
// TODO: Assert to restore in a way compatible with the constexpr.
|
|
// __glibcxx_assert(this->_M_len > 0);
|
|
return *this->_M_str;
|
|
}
|
|
|
|
constexpr const _CharT&
|
|
back() const
|
|
{
|
|
// TODO: Assert to restore in a way compatible with the constexpr.
|
|
// __glibcxx_assert(this->_M_len > 0);
|
|
return *(this->_M_str + this->_M_len - 1);
|
|
}
|
|
|
|
constexpr const _CharT*
|
|
data() const noexcept
|
|
{ return this->_M_str; }
|
|
|
|
// [string.view.modifiers], modifiers:
|
|
|
|
constexpr void
|
|
remove_prefix(size_type __n)
|
|
{
|
|
__glibcxx_assert(this->_M_len >= __n);
|
|
this->_M_str += __n;
|
|
this->_M_len -= __n;
|
|
}
|
|
|
|
constexpr void
|
|
remove_suffix(size_type __n)
|
|
{ this->_M_len -= __n; }
|
|
|
|
constexpr void
|
|
swap(basic_string_view& __sv) noexcept
|
|
{
|
|
auto __tmp = *this;
|
|
*this = __sv;
|
|
__sv = __tmp;
|
|
}
|
|
|
|
|
|
// [string.view.ops], string operations:
|
|
|
|
size_type
|
|
copy(_CharT* __str, size_type __n, size_type __pos = 0) const
|
|
{
|
|
__glibcxx_requires_string_len(__str, __n);
|
|
if (__pos > this->_M_len)
|
|
__throw_out_of_range_fmt(__N("basic_string_view::copy: __pos "
|
|
"(which is %zu) > this->size() "
|
|
"(which is %zu)"),
|
|
__pos, this->size());
|
|
size_type __rlen{std::min(__n, size_type{this->_M_len - __pos})};
|
|
for (auto __begin = this->_M_str + __pos,
|
|
__end = __begin + __rlen; __begin != __end;)
|
|
*__str++ = *__begin++;
|
|
return __rlen;
|
|
}
|
|
|
|
|
|
// [string.view.ops], string operations:
|
|
|
|
constexpr basic_string_view
|
|
substr(size_type __pos, size_type __n=npos) const
|
|
{
|
|
return __pos <= this->_M_len
|
|
? basic_string_view{this->_M_str + __pos,
|
|
std::min(__n, size_type{this->_M_len - __pos})}
|
|
: (__throw_out_of_range_fmt(__N("basic_string_view::substr: __pos "
|
|
"(which is %zu) > this->size() "
|
|
"(which is %zu)"),
|
|
__pos, this->size()), basic_string_view{});
|
|
}
|
|
|
|
constexpr int
|
|
compare(basic_string_view __str) const noexcept
|
|
{
|
|
int __ret = traits_type::compare(this->_M_str, __str._M_str,
|
|
std::min(this->_M_len, __str._M_len));
|
|
if (__ret == 0)
|
|
__ret = _S_compare(this->_M_len, __str._M_len);
|
|
return __ret;
|
|
}
|
|
|
|
constexpr int
|
|
compare(size_type __pos1, size_type __n1, basic_string_view __str) const
|
|
{ return this->substr(__pos1, __n1).compare(__str); }
|
|
|
|
constexpr int
|
|
compare(size_type __pos1, size_type __n1,
|
|
basic_string_view __str, size_type __pos2, size_type __n2) const
|
|
{ return this->substr(__pos1, __n1).compare(__str.substr(__pos2, __n2)); }
|
|
|
|
constexpr int
|
|
compare(const _CharT* __str) const noexcept
|
|
{ return this->compare(basic_string_view{__str}); }
|
|
|
|
constexpr int
|
|
compare(size_type __pos1, size_type __n1, const _CharT* __str) const
|
|
{ return this->substr(__pos1, __n1).compare(basic_string_view{__str}); }
|
|
|
|
constexpr int
|
|
compare(size_type __pos1, size_type __n1,
|
|
const _CharT* __str, size_type __n2) const
|
|
{
|
|
return this->substr(__pos1, __n1)
|
|
.compare(basic_string_view(__str, __n2));
|
|
}
|
|
|
|
constexpr size_type
|
|
find(basic_string_view __str, size_type __pos = 0) const noexcept
|
|
{ return this->find(__str._M_str, __pos, __str._M_len); }
|
|
|
|
constexpr size_type
|
|
find(_CharT __c, size_type __pos=0) const noexcept;
|
|
|
|
constexpr size_type
|
|
find(const _CharT* __str, size_type __pos, size_type __n) const noexcept;
|
|
|
|
constexpr size_type
|
|
find(const _CharT* __str, size_type __pos=0) const noexcept
|
|
{ return this->find(__str, __pos, traits_type::length(__str)); }
|
|
|
|
constexpr size_type
|
|
rfind(basic_string_view __str, size_type __pos = npos) const noexcept
|
|
{ return this->rfind(__str._M_str, __pos, __str._M_len); }
|
|
|
|
constexpr size_type
|
|
rfind(_CharT __c, size_type __pos = npos) const noexcept;
|
|
|
|
constexpr size_type
|
|
rfind(const _CharT* __str, size_type __pos, size_type __n) const noexcept;
|
|
|
|
constexpr size_type
|
|
rfind(const _CharT* __str, size_type __pos = npos) const noexcept
|
|
{ return this->rfind(__str, __pos, traits_type::length(__str)); }
|
|
|
|
constexpr size_type
|
|
find_first_of(basic_string_view __str, size_type __pos = 0) const noexcept
|
|
{ return this->find_first_of(__str._M_str, __pos, __str._M_len); }
|
|
|
|
constexpr size_type
|
|
find_first_of(_CharT __c, size_type __pos = 0) const noexcept
|
|
{ return this->find(__c, __pos); }
|
|
|
|
constexpr size_type
|
|
find_first_of(const _CharT* __str, size_type __pos, size_type __n) const;
|
|
|
|
constexpr size_type
|
|
find_first_of(const _CharT* __str, size_type __pos = 0) const noexcept
|
|
{ return this->find_first_of(__str, __pos, traits_type::length(__str)); }
|
|
|
|
constexpr size_type
|
|
find_last_of(basic_string_view __str,
|
|
size_type __pos = npos) const noexcept
|
|
{ return this->find_last_of(__str._M_str, __pos, __str._M_len); }
|
|
|
|
constexpr size_type
|
|
find_last_of(_CharT __c, size_type __pos=npos) const noexcept
|
|
{ return this->rfind(__c, __pos); }
|
|
|
|
constexpr size_type
|
|
find_last_of(const _CharT* __str, size_type __pos, size_type __n) const;
|
|
|
|
constexpr size_type
|
|
find_last_of(const _CharT* __str, size_type __pos = npos) const noexcept
|
|
{ return this->find_last_of(__str, __pos, traits_type::length(__str)); }
|
|
|
|
constexpr size_type
|
|
find_first_not_of(basic_string_view __str,
|
|
size_type __pos = 0) const noexcept
|
|
{ return this->find_first_not_of(__str._M_str, __pos, __str._M_len); }
|
|
|
|
constexpr size_type
|
|
find_first_not_of(_CharT __c, size_type __pos = 0) const noexcept;
|
|
|
|
constexpr size_type
|
|
find_first_not_of(const _CharT* __str,
|
|
size_type __pos, size_type __n) const;
|
|
|
|
constexpr size_type
|
|
find_first_not_of(const _CharT* __str, size_type __pos = 0) const noexcept
|
|
{
|
|
return this->find_first_not_of(__str, __pos,
|
|
traits_type::length(__str));
|
|
}
|
|
|
|
constexpr size_type
|
|
find_last_not_of(basic_string_view __str,
|
|
size_type __pos = npos) const noexcept
|
|
{ return this->find_last_not_of(__str._M_str, __pos, __str._M_len); }
|
|
|
|
constexpr size_type
|
|
find_last_not_of(_CharT __c, size_type __pos = npos) const noexcept;
|
|
|
|
constexpr size_type
|
|
find_last_not_of(const _CharT* __str,
|
|
size_type __pos, size_type __n) const;
|
|
|
|
constexpr size_type
|
|
find_last_not_of(const _CharT* __str,
|
|
size_type __pos = npos) const noexcept
|
|
{
|
|
return this->find_last_not_of(__str, __pos,
|
|
traits_type::length(__str));
|
|
}
|
|
|
|
constexpr size_type
|
|
_M_check(size_type __pos, const char* __s) const
|
|
{
|
|
if (__pos > this->size())
|
|
__throw_out_of_range_fmt(__N("%s: __pos (which is %zu) > "
|
|
"this->size() (which is %zu)"),
|
|
__s, __pos, this->size());
|
|
return __pos;
|
|
}
|
|
|
|
// NB: _M_limit doesn't check for a bad __pos value.
|
|
constexpr size_type
|
|
_M_limit(size_type __pos, size_type __off) const _GLIBCXX_NOEXCEPT
|
|
{
|
|
const bool __testoff = __off < this->size() - __pos;
|
|
return __testoff ? __off : this->size() - __pos;
|
|
}
|
|
|
|
private:
|
|
|
|
static constexpr int
|
|
_S_compare(size_type __n1, size_type __n2) noexcept
|
|
{
|
|
return difference_type{__n1 - __n2} > std::numeric_limits<int>::max()
|
|
? std::numeric_limits<int>::max()
|
|
: difference_type{__n1 - __n2} < std::numeric_limits<int>::min()
|
|
? std::numeric_limits<int>::min()
|
|
: static_cast<int>(difference_type{__n1 - __n2});
|
|
}
|
|
|
|
size_t _M_len;
|
|
const _CharT* _M_str;
|
|
};
|
|
|
|
// [string.view.comparison], non-member basic_string_view comparison function
|
|
|
|
namespace __detail
|
|
{
|
|
// Identity transform to create a non-deduced context, so that only one
|
|
// argument participates in template argument deduction and the other
|
|
// argument gets implicitly converted to the deduced type. See n3766.html.
|
|
template<typename _Tp>
|
|
using __idt = common_type_t<_Tp>;
|
|
}
|
|
|
|
template<typename _CharT, typename _Traits>
|
|
constexpr bool
|
|
operator==(basic_string_view<_CharT, _Traits> __x,
|
|
basic_string_view<_CharT, _Traits> __y) noexcept
|
|
{ return __x.size() == __y.size() && __x.compare(__y) == 0; }
|
|
|
|
template<typename _CharT, typename _Traits>
|
|
constexpr bool
|
|
operator==(basic_string_view<_CharT, _Traits> __x,
|
|
__detail::__idt<basic_string_view<_CharT, _Traits>> __y) noexcept
|
|
{ return __x.size() == __y.size() && __x.compare(__y) == 0; }
|
|
|
|
template<typename _CharT, typename _Traits>
|
|
constexpr bool
|
|
operator==(__detail::__idt<basic_string_view<_CharT, _Traits>> __x,
|
|
basic_string_view<_CharT, _Traits> __y) noexcept
|
|
{ return __x.size() == __y.size() && __x.compare(__y) == 0; }
|
|
|
|
template<typename _CharT, typename _Traits>
|
|
constexpr bool
|
|
operator!=(basic_string_view<_CharT, _Traits> __x,
|
|
basic_string_view<_CharT, _Traits> __y) noexcept
|
|
{ return !(__x == __y); }
|
|
|
|
template<typename _CharT, typename _Traits>
|
|
constexpr bool
|
|
operator!=(basic_string_view<_CharT, _Traits> __x,
|
|
__detail::__idt<basic_string_view<_CharT, _Traits>> __y) noexcept
|
|
{ return !(__x == __y); }
|
|
|
|
template<typename _CharT, typename _Traits>
|
|
constexpr bool
|
|
operator!=(__detail::__idt<basic_string_view<_CharT, _Traits>> __x,
|
|
basic_string_view<_CharT, _Traits> __y) noexcept
|
|
{ return !(__x == __y); }
|
|
|
|
template<typename _CharT, typename _Traits>
|
|
constexpr bool
|
|
operator< (basic_string_view<_CharT, _Traits> __x,
|
|
basic_string_view<_CharT, _Traits> __y) noexcept
|
|
{ return __x.compare(__y) < 0; }
|
|
|
|
template<typename _CharT, typename _Traits>
|
|
constexpr bool
|
|
operator< (basic_string_view<_CharT, _Traits> __x,
|
|
__detail::__idt<basic_string_view<_CharT, _Traits>> __y) noexcept
|
|
{ return __x.compare(__y) < 0; }
|
|
|
|
template<typename _CharT, typename _Traits>
|
|
constexpr bool
|
|
operator< (__detail::__idt<basic_string_view<_CharT, _Traits>> __x,
|
|
basic_string_view<_CharT, _Traits> __y) noexcept
|
|
{ return __x.compare(__y) < 0; }
|
|
|
|
template<typename _CharT, typename _Traits>
|
|
constexpr bool
|
|
operator> (basic_string_view<_CharT, _Traits> __x,
|
|
basic_string_view<_CharT, _Traits> __y) noexcept
|
|
{ return __x.compare(__y) > 0; }
|
|
|
|
template<typename _CharT, typename _Traits>
|
|
constexpr bool
|
|
operator> (basic_string_view<_CharT, _Traits> __x,
|
|
__detail::__idt<basic_string_view<_CharT, _Traits>> __y) noexcept
|
|
{ return __x.compare(__y) > 0; }
|
|
|
|
template<typename _CharT, typename _Traits>
|
|
constexpr bool
|
|
operator> (__detail::__idt<basic_string_view<_CharT, _Traits>> __x,
|
|
basic_string_view<_CharT, _Traits> __y) noexcept
|
|
{ return __x.compare(__y) > 0; }
|
|
|
|
template<typename _CharT, typename _Traits>
|
|
constexpr bool
|
|
operator<=(basic_string_view<_CharT, _Traits> __x,
|
|
basic_string_view<_CharT, _Traits> __y) noexcept
|
|
{ return __x.compare(__y) <= 0; }
|
|
|
|
template<typename _CharT, typename _Traits>
|
|
constexpr bool
|
|
operator<=(basic_string_view<_CharT, _Traits> __x,
|
|
__detail::__idt<basic_string_view<_CharT, _Traits>> __y) noexcept
|
|
{ return __x.compare(__y) <= 0; }
|
|
|
|
template<typename _CharT, typename _Traits>
|
|
constexpr bool
|
|
operator<=(__detail::__idt<basic_string_view<_CharT, _Traits>> __x,
|
|
basic_string_view<_CharT, _Traits> __y) noexcept
|
|
{ return __x.compare(__y) <= 0; }
|
|
|
|
template<typename _CharT, typename _Traits>
|
|
constexpr bool
|
|
operator>=(basic_string_view<_CharT, _Traits> __x,
|
|
basic_string_view<_CharT, _Traits> __y) noexcept
|
|
{ return __x.compare(__y) >= 0; }
|
|
|
|
template<typename _CharT, typename _Traits>
|
|
constexpr bool
|
|
operator>=(basic_string_view<_CharT, _Traits> __x,
|
|
__detail::__idt<basic_string_view<_CharT, _Traits>> __y) noexcept
|
|
{ return __x.compare(__y) >= 0; }
|
|
|
|
template<typename _CharT, typename _Traits>
|
|
constexpr bool
|
|
operator>=(__detail::__idt<basic_string_view<_CharT, _Traits>> __x,
|
|
basic_string_view<_CharT, _Traits> __y) noexcept
|
|
{ return __x.compare(__y) >= 0; }
|
|
|
|
// [string.view.io], Inserters and extractors
|
|
template<typename _CharT, typename _Traits>
|
|
inline basic_ostream<_CharT, _Traits>&
|
|
operator<<(basic_ostream<_CharT, _Traits>& __os,
|
|
basic_string_view<_CharT,_Traits> __str)
|
|
{ return __ostream_insert(__os, __str.data(), __str.size()); }
|
|
|
|
|
|
// basic_string_view typedef names
|
|
|
|
using string_view = basic_string_view<char>;
|
|
#ifdef _GLIBCXX_USE_WCHAR_T
|
|
using wstring_view = basic_string_view<wchar_t>;
|
|
#endif
|
|
#ifdef _GLIBCXX_USE_C99_STDINT_TR1
|
|
using u16string_view = basic_string_view<char16_t>;
|
|
using u32string_view = basic_string_view<char32_t>;
|
|
#endif
|
|
|
|
// [string.view.hash], hash support:
|
|
|
|
template<typename _Tp>
|
|
struct hash;
|
|
|
|
template<>
|
|
struct hash<string_view>
|
|
: public __hash_base<size_t, string_view>
|
|
{
|
|
size_t
|
|
operator()(const string_view& __str) const noexcept
|
|
{ return std::_Hash_impl::hash(__str.data(), __str.length()); }
|
|
};
|
|
|
|
template<>
|
|
struct __is_fast_hash<hash<string_view>> : std::false_type
|
|
{ };
|
|
|
|
#ifdef _GLIBCXX_USE_WCHAR_T
|
|
template<>
|
|
struct hash<wstring_view>
|
|
: public __hash_base<size_t, wstring>
|
|
{
|
|
size_t
|
|
operator()(const wstring_view& __s) const noexcept
|
|
{ return std::_Hash_impl::hash(__s.data(),
|
|
__s.length() * sizeof(wchar_t)); }
|
|
};
|
|
|
|
template<>
|
|
struct __is_fast_hash<hash<wstring_view>> : std::false_type
|
|
{ };
|
|
#endif
|
|
|
|
#ifdef _GLIBCXX_USE_C99_STDINT_TR1
|
|
template<>
|
|
struct hash<u16string_view>
|
|
: public __hash_base<size_t, u16string_view>
|
|
{
|
|
size_t
|
|
operator()(const u16string_view& __s) const noexcept
|
|
{ return std::_Hash_impl::hash(__s.data(),
|
|
__s.length() * sizeof(char16_t)); }
|
|
};
|
|
|
|
template<>
|
|
struct __is_fast_hash<hash<u16string_view>> : std::false_type
|
|
{ };
|
|
|
|
template<>
|
|
struct hash<u32string_view>
|
|
: public __hash_base<size_t, u32string_view>
|
|
{
|
|
size_t
|
|
operator()(const u32string_view& __s) const noexcept
|
|
{ return std::_Hash_impl::hash(__s.data(),
|
|
__s.length() * sizeof(char32_t)); }
|
|
};
|
|
|
|
template<>
|
|
struct __is_fast_hash<hash<u32string_view>> : std::false_type
|
|
{ };
|
|
#endif
|
|
|
|
inline namespace literals
|
|
{
|
|
inline namespace string_view_literals
|
|
{
|
|
inline constexpr basic_string_view<char>
|
|
operator""sv(const char* __str, size_t __len)
|
|
{ return basic_string_view<char>{__str, __len}; }
|
|
|
|
#ifdef _GLIBCXX_USE_WCHAR_T
|
|
inline constexpr basic_string_view<wchar_t>
|
|
operator""sv(const wchar_t* __str, size_t __len)
|
|
{ return basic_string_view<wchar_t>{__str, __len}; }
|
|
#endif
|
|
|
|
#ifdef _GLIBCXX_USE_C99_STDINT_TR1
|
|
inline constexpr basic_string_view<char16_t>
|
|
operator""sv(const char16_t* __str, size_t __len)
|
|
{ return basic_string_view<char16_t>{__str, __len}; }
|
|
|
|
inline constexpr basic_string_view<char32_t>
|
|
operator""sv(const char32_t* __str, size_t __len)
|
|
{ return basic_string_view<char32_t>{__str, __len}; }
|
|
#endif
|
|
} // namespace string_literals
|
|
} // namespace literals
|
|
|
|
_GLIBCXX_END_NAMESPACE_VERSION
|
|
} // namespace std
|
|
|
|
#include <bits/string_view.tcc>
|
|
|
|
#endif // __cplusplus <= 201402L
|
|
|
|
#endif // _GLIBCXX_EXPERIMENTAL_STRING_VIEW
|