548 lines
18 KiB
C++
548 lines
18 KiB
C++
// Output streams -*- C++ -*-
|
|
|
|
// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003
|
|
// 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: 27.6.2 Output streams
|
|
//
|
|
|
|
/** @file ostream
|
|
* This is a Standard C++ Library header.
|
|
*/
|
|
|
|
#ifndef _GLIBCXX_OSTREAM
|
|
#define _GLIBCXX_OSTREAM 1
|
|
|
|
#pragma GCC system_header
|
|
|
|
#include <ios>
|
|
|
|
namespace std
|
|
{
|
|
// [27.6.2.1] Template class basic_ostream
|
|
/**
|
|
* @brief Controlling output.
|
|
*
|
|
* This is the base class for all output streams. It provides text
|
|
* formatting of all builtin types, and communicates with any class
|
|
* derived from basic_streambuf to do the actual output.
|
|
*/
|
|
template<typename _CharT, typename _Traits>
|
|
class basic_ostream : virtual public basic_ios<_CharT, _Traits>
|
|
{
|
|
public:
|
|
// Types (inherited from basic_ios (27.4.4)):
|
|
typedef _CharT char_type;
|
|
typedef typename _Traits::int_type int_type;
|
|
typedef typename _Traits::pos_type pos_type;
|
|
typedef typename _Traits::off_type off_type;
|
|
typedef _Traits traits_type;
|
|
|
|
// Non-standard Types:
|
|
typedef basic_streambuf<_CharT, _Traits> __streambuf_type;
|
|
typedef basic_ios<_CharT, _Traits> __ios_type;
|
|
typedef basic_ostream<_CharT, _Traits> __ostream_type;
|
|
typedef num_put<_CharT, ostreambuf_iterator<_CharT, _Traits> >
|
|
__num_put_type;
|
|
typedef ctype<_CharT> __ctype_type;
|
|
|
|
template<typename _CharT2, typename _Traits2>
|
|
friend basic_ostream<_CharT2, _Traits2>&
|
|
operator<<(basic_ostream<_CharT2, _Traits2>&, _CharT2);
|
|
|
|
template<typename _Traits2>
|
|
friend basic_ostream<char, _Traits2>&
|
|
operator<<(basic_ostream<char, _Traits2>&, char);
|
|
|
|
template<typename _CharT2, typename _Traits2>
|
|
friend basic_ostream<_CharT2, _Traits2>&
|
|
operator<<(basic_ostream<_CharT2, _Traits2>&, const _CharT2*);
|
|
|
|
template<typename _Traits2>
|
|
friend basic_ostream<char, _Traits2>&
|
|
operator<<(basic_ostream<char, _Traits2>&, const char*);
|
|
|
|
template<typename _CharT2, typename _Traits2>
|
|
friend basic_ostream<_CharT2, _Traits2>&
|
|
operator<<(basic_ostream<_CharT2, _Traits2>&, const char*);
|
|
|
|
// [27.6.2.2] constructor/destructor
|
|
/**
|
|
* @brief Base constructor.
|
|
*
|
|
* This ctor is almost never called by the user directly, rather from
|
|
* derived classes' initialization lists, which pass a pointer to
|
|
* their own stream buffer.
|
|
*/
|
|
explicit
|
|
basic_ostream(__streambuf_type* __sb)
|
|
{ this->init(__sb); }
|
|
|
|
/**
|
|
* @brief Base destructor.
|
|
*
|
|
* This does very little apart from providing a virtual base dtor.
|
|
*/
|
|
virtual
|
|
~basic_ostream() { }
|
|
|
|
// [27.6.2.3] prefix/suffix
|
|
class sentry;
|
|
friend class sentry;
|
|
|
|
// [27.6.2.5] formatted output
|
|
// [27.6.2.5.3] basic_ostream::operator<<
|
|
//@{
|
|
/**
|
|
* @brief Interface for manipulators.
|
|
*
|
|
* Manuipulators such as @c std::endl and @c std::hex use these
|
|
* functions in constructs like "std::cout << std::endl". For more
|
|
* information, see the iomanip header.
|
|
*/
|
|
inline __ostream_type&
|
|
operator<<(__ostream_type& (*__pf)(__ostream_type&));
|
|
|
|
inline __ostream_type&
|
|
operator<<(__ios_type& (*__pf)(__ios_type&));
|
|
|
|
inline __ostream_type&
|
|
operator<<(ios_base& (*__pf) (ios_base&));
|
|
//@}
|
|
|
|
// [27.6.2.5.2] arithmetic inserters
|
|
/**
|
|
* @name Arithmetic Inserters
|
|
*
|
|
* All the @c operator<< functions (aka <em>formatted output
|
|
* functions</em>) have some common behavior. Each starts by
|
|
* constructing a temporary object of type std::basic_ostream::sentry.
|
|
* This can have several effects, concluding with the setting of a
|
|
* status flag; see the sentry documentation for more.
|
|
*
|
|
* If the sentry status is good, the function tries to generate
|
|
* whatever data is appropriate for the type of the argument.
|
|
*
|
|
* If an exception is thrown during insertion, ios_base::badbit
|
|
* will be turned on in the stream's error state without causing an
|
|
* ios_base::failure to be thrown. The original exception will then
|
|
* be rethrown.
|
|
*/
|
|
//@{
|
|
/**
|
|
* @brief Basic arithmetic inserters
|
|
* @param A variable of builtin type.
|
|
* @return @c *this if successful
|
|
*
|
|
* These functions use the stream's current locale (specifically, the
|
|
* @c num_get facet) to perform numeric formatting.
|
|
*/
|
|
__ostream_type&
|
|
operator<<(long __n);
|
|
|
|
__ostream_type&
|
|
operator<<(unsigned long __n);
|
|
|
|
__ostream_type&
|
|
operator<<(bool __n);
|
|
|
|
__ostream_type&
|
|
operator<<(short __n)
|
|
{
|
|
ios_base::fmtflags __fmt = this->flags() & ios_base::basefield;
|
|
if (__fmt & ios_base::oct || __fmt & ios_base::hex)
|
|
return this->operator<<(static_cast<unsigned long>
|
|
(static_cast<unsigned short>(__n)));
|
|
else
|
|
return this->operator<<(static_cast<long>(__n));
|
|
}
|
|
|
|
__ostream_type&
|
|
operator<<(unsigned short __n)
|
|
{ return this->operator<<(static_cast<unsigned long>(__n)); }
|
|
|
|
__ostream_type&
|
|
operator<<(int __n)
|
|
{
|
|
ios_base::fmtflags __fmt = this->flags() & ios_base::basefield;
|
|
if (__fmt & ios_base::oct || __fmt & ios_base::hex)
|
|
return this->operator<<(static_cast<unsigned long>
|
|
(static_cast<unsigned int>(__n)));
|
|
else
|
|
return this->operator<<(static_cast<long>(__n));
|
|
}
|
|
|
|
__ostream_type&
|
|
operator<<(unsigned int __n)
|
|
{ return this->operator<<(static_cast<unsigned long>(__n)); }
|
|
|
|
#ifdef _GLIBCXX_USE_LONG_LONG
|
|
__ostream_type&
|
|
operator<<(long long __n);
|
|
|
|
__ostream_type&
|
|
operator<<(unsigned long long __n);
|
|
#endif
|
|
|
|
__ostream_type&
|
|
operator<<(double __f);
|
|
|
|
__ostream_type&
|
|
operator<<(float __f)
|
|
{ return this->operator<<(static_cast<double>(__f)); }
|
|
|
|
__ostream_type&
|
|
operator<<(long double __f);
|
|
|
|
__ostream_type&
|
|
operator<<(const void* __p);
|
|
|
|
/**
|
|
* @brief Extracting from another streambuf.
|
|
* @param sb A pointer to a streambuf
|
|
*
|
|
* This function behaves like one of the basic arithmetic extractors,
|
|
* in that it also constructs a sentry object and has the same error
|
|
* handling behavior.
|
|
*
|
|
* If @a sb is NULL, the stream will set failbit in its error state.
|
|
*
|
|
* Characters are extracted from @a sb and inserted into @c *this
|
|
* until one of the following occurs:
|
|
*
|
|
* - the input stream reaches end-of-file,
|
|
* - insertion into the output sequence fails (in this case, the
|
|
* character that would have been inserted is not extracted), or
|
|
* - an exception occurs while getting a character from @a sb, which
|
|
* sets failbit in the error state
|
|
*
|
|
* If the function inserts no characters, failbit is set.
|
|
*/
|
|
__ostream_type&
|
|
operator<<(__streambuf_type* __sb);
|
|
//@}
|
|
|
|
// [27.6.2.6] unformatted output functions
|
|
/**
|
|
* @name Unformatted Output Functions
|
|
*
|
|
* All the unformatted output functions have some common behavior.
|
|
* Each starts by constructing a temporary object of type
|
|
* std::basic_ostream::sentry. This has several effects, concluding
|
|
* with the setting of a status flag; see the sentry documentation
|
|
* for more.
|
|
*
|
|
* If the sentry status is good, the function tries to generate
|
|
* whatever data is appropriate for the type of the argument.
|
|
*
|
|
* If an exception is thrown during insertion, ios_base::badbit
|
|
* will be turned on in the stream's error state. If badbit is on in
|
|
* the stream's exceptions mask, the exception will be rethrown
|
|
* without completing its actions.
|
|
*/
|
|
//@{
|
|
/**
|
|
* @brief Simple insertion.
|
|
* @param c The character to insert.
|
|
* @return *this
|
|
*
|
|
* Tries to insert @a c.
|
|
*
|
|
* @note This function is not overloaded on signed char and
|
|
* unsigned char.
|
|
*/
|
|
__ostream_type&
|
|
put(char_type __c);
|
|
|
|
// Core write functionality, without sentry.
|
|
void
|
|
_M_write(const char_type* __s, streamsize __n)
|
|
{
|
|
streamsize __put = this->rdbuf()->sputn(__s, __n);
|
|
if (__put != __n)
|
|
this->setstate(ios_base::badbit);
|
|
}
|
|
|
|
/**
|
|
* @brief Character string insertion.
|
|
* @param s The array to insert.
|
|
* @param n Maximum number of characters to insert.
|
|
* @return *this
|
|
*
|
|
* Characters are copied from @a s and inserted into the stream until
|
|
* one of the following happens:
|
|
*
|
|
* - @a n characters are inserted
|
|
* - inserting into the output sequence fails (in this case, badbit
|
|
* will be set in the stream's error state)
|
|
*
|
|
* @note This function is not overloaded on signed char and
|
|
* unsigned char.
|
|
*/
|
|
__ostream_type&
|
|
write(const char_type* __s, streamsize __n);
|
|
//@}
|
|
|
|
/**
|
|
* @brief Synchronizing the stream buffer.
|
|
* @return *this
|
|
*
|
|
* If @c rdbuf() is a null pointer, changes nothing.
|
|
*
|
|
* Otherwise, calls @c rdbuf()->pubsync(), and if that returns -1,
|
|
* sets badbit.
|
|
*/
|
|
__ostream_type&
|
|
flush();
|
|
|
|
// [27.6.2.4] seek members
|
|
/**
|
|
* @brief Getting the current write position.
|
|
* @return A file position object.
|
|
*
|
|
* If @c fail() is not false, returns @c pos_type(-1) to indicate
|
|
* failure. Otherwise returns @c rdbuf()->pubseekoff(0,cur,out).
|
|
*/
|
|
pos_type
|
|
tellp();
|
|
|
|
/**
|
|
* @brief Changing the current write position.
|
|
* @param pos A file position object.
|
|
* @return *this
|
|
*
|
|
* If @c fail() is not true, calls @c rdbuf()->pubseekpos(pos). If
|
|
* that function fails, sets failbit.
|
|
*/
|
|
__ostream_type&
|
|
seekp(pos_type);
|
|
|
|
/**
|
|
* @brief Changing the current write position.
|
|
* @param off A file offset object.
|
|
* @param dir The direction in which to seek.
|
|
* @return *this
|
|
*
|
|
* If @c fail() is not true, calls @c rdbuf()->pubseekoff(off,dir).
|
|
* If that function fails, sets failbit.
|
|
*/
|
|
__ostream_type&
|
|
seekp(off_type, ios_base::seekdir);
|
|
|
|
protected:
|
|
explicit
|
|
basic_ostream() { }
|
|
};
|
|
|
|
/**
|
|
* @brief Performs setup work for output streams.
|
|
*
|
|
* Objects of this class are created before all of the standard
|
|
* inserters are run. It is responsible for "exception-safe prefix and
|
|
* suffix operations." Additional actions may be added by the
|
|
* implementation, and we list them in
|
|
* http://gcc.gnu.org/onlinedocs/libstdc++/17_intro/howto.html#5
|
|
* under [27.6] notes.
|
|
*/
|
|
template <typename _CharT, typename _Traits>
|
|
class basic_ostream<_CharT, _Traits>::sentry
|
|
{
|
|
// Data Members:
|
|
bool _M_ok;
|
|
basic_ostream<_CharT,_Traits>& _M_os;
|
|
|
|
public:
|
|
/**
|
|
* @brief The constructor performs preparatory work.
|
|
* @param os The output stream to guard.
|
|
*
|
|
* If the stream state is good (@a os.good() is true), then if the
|
|
* stream is tied to another output stream, @c is.tie()->flush()
|
|
* is called to synchronize the output sequences.
|
|
*
|
|
* If the stream state is still good, then the sentry state becomes
|
|
* true ("okay").
|
|
*/
|
|
explicit
|
|
sentry(basic_ostream<_CharT,_Traits>& __os);
|
|
|
|
/**
|
|
* @brief Possibly flushes the stream.
|
|
*
|
|
* If @c ios_base::unitbuf is set in @c os.flags(), and
|
|
* @c std::uncaught_exception() is true, the sentry destructor calls
|
|
* @c flush() on the output stream.
|
|
*/
|
|
~sentry()
|
|
{
|
|
// XXX MT
|
|
if (_M_os.flags() & ios_base::unitbuf && !uncaught_exception())
|
|
{
|
|
// Can't call flush directly or else will get into recursive lock.
|
|
if (_M_os.rdbuf() && _M_os.rdbuf()->pubsync() == -1)
|
|
_M_os.setstate(ios_base::badbit);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief Quick status checking.
|
|
* @return The sentry state.
|
|
*
|
|
* For ease of use, sentries may be converted to booleans. The
|
|
* return value is that of the sentry state (true == okay).
|
|
*/
|
|
operator bool() const
|
|
{ return _M_ok; }
|
|
};
|
|
|
|
// [27.6.2.5.4] character insertion templates
|
|
//@{
|
|
/**
|
|
* @brief Character inserters
|
|
* @param out An output stream.
|
|
* @param c A character.
|
|
* @return out
|
|
*
|
|
* Behaves like one of the formatted arithmetic inserters described in
|
|
* std::basic_ostream. After constructing a sentry object with good
|
|
* status, this function inserts a single character and any required
|
|
* padding (as determined by [22.2.2.2.2]). @c out.width(0) is then
|
|
* called.
|
|
*
|
|
* If @a c is of type @c char and the character type of the stream is not
|
|
* @c char, the character is widened before insertion.
|
|
*/
|
|
template<typename _CharT, typename _Traits>
|
|
basic_ostream<_CharT, _Traits>&
|
|
operator<<(basic_ostream<_CharT, _Traits>& __out, _CharT __c);
|
|
|
|
template<typename _CharT, typename _Traits>
|
|
basic_ostream<_CharT, _Traits>&
|
|
operator<<(basic_ostream<_CharT, _Traits>& __out, char __c)
|
|
{ return (__out << __out.widen(__c)); }
|
|
|
|
// Specialization
|
|
template <class _Traits>
|
|
basic_ostream<char, _Traits>&
|
|
operator<<(basic_ostream<char, _Traits>& __out, char __c);
|
|
|
|
// Signed and unsigned
|
|
template<class _Traits>
|
|
basic_ostream<char, _Traits>&
|
|
operator<<(basic_ostream<char, _Traits>& __out, signed char __c)
|
|
{ return (__out << static_cast<char>(__c)); }
|
|
|
|
template<class _Traits>
|
|
basic_ostream<char, _Traits>&
|
|
operator<<(basic_ostream<char, _Traits>& __out, unsigned char __c)
|
|
{ return (__out << static_cast<char>(__c)); }
|
|
//@}
|
|
|
|
//@{
|
|
/**
|
|
* @brief String inserters
|
|
* @param out An output stream.
|
|
* @param s A character string.
|
|
* @return out
|
|
* @pre @a s must be a non-NULL pointer
|
|
*
|
|
* Behaves like one of the formatted arithmetic inserters described in
|
|
* std::basic_ostream. After constructing a sentry object with good
|
|
* status, this function inserts @c traits::length(s) characters starting
|
|
* at @a s, widened if necessary, followed by any required padding (as
|
|
* determined by [22.2.2.2.2]). @c out.width(0) is then called.
|
|
*/
|
|
template<typename _CharT, typename _Traits>
|
|
basic_ostream<_CharT, _Traits>&
|
|
operator<<(basic_ostream<_CharT, _Traits>& __out, const _CharT* __s);
|
|
|
|
template<typename _CharT, typename _Traits>
|
|
basic_ostream<_CharT, _Traits> &
|
|
operator<<(basic_ostream<_CharT, _Traits>& __out, const char* __s);
|
|
|
|
// Partial specializationss
|
|
template<class _Traits>
|
|
basic_ostream<char, _Traits>&
|
|
operator<<(basic_ostream<char, _Traits>& __out, const char* __s);
|
|
|
|
// Signed and unsigned
|
|
template<class _Traits>
|
|
basic_ostream<char, _Traits>&
|
|
operator<<(basic_ostream<char, _Traits>& __out, const signed char* __s)
|
|
{ return (__out << reinterpret_cast<const char*>(__s)); }
|
|
|
|
template<class _Traits>
|
|
basic_ostream<char, _Traits> &
|
|
operator<<(basic_ostream<char, _Traits>& __out, const unsigned char* __s)
|
|
{ return (__out << reinterpret_cast<const char*>(__s)); }
|
|
//@}
|
|
|
|
// [27.6.2.7] standard basic_ostream manipulators
|
|
/**
|
|
* @brief Write a newline and flush the stream.
|
|
*
|
|
* This manipulator is often mistakenly used when a simple newline is
|
|
* desired, leading to poor buffering performance. See
|
|
* http://gcc.gnu.org/onlinedocs/libstdc++/27_io/howto.html#2 for more
|
|
* on this subject.
|
|
*/
|
|
template<typename _CharT, typename _Traits>
|
|
basic_ostream<_CharT, _Traits>&
|
|
endl(basic_ostream<_CharT, _Traits>& __os)
|
|
{ return flush(__os.put(__os.widen('\n'))); }
|
|
|
|
/**
|
|
* @brief Write a null character into the output sequence.
|
|
*
|
|
* "Null character" is @c CharT() by definition. For CharT of @c char,
|
|
* this correctly writes the ASCII @c NUL character string terminator.
|
|
*/
|
|
template<typename _CharT, typename _Traits>
|
|
basic_ostream<_CharT, _Traits>&
|
|
ends(basic_ostream<_CharT, _Traits>& __os)
|
|
{ return __os.put(_CharT()); }
|
|
|
|
/**
|
|
* @brief Flushes the output stream.
|
|
*
|
|
* This manipulator simply calls the stream's @c flush() member function.
|
|
*/
|
|
template<typename _CharT, typename _Traits>
|
|
basic_ostream<_CharT, _Traits>&
|
|
flush(basic_ostream<_CharT, _Traits>& __os)
|
|
{ return __os.flush(); }
|
|
|
|
} // namespace std
|
|
|
|
#ifndef _GLIBCXX_EXPORT_TEMPLATE
|
|
# include <bits/ostream.tcc>
|
|
#endif
|
|
|
|
#endif /* _GLIBCXX_OSTREAM */
|