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gcc/libstdc++-v3/include/bits/istream.tcc
Paolo Carlini 49d5c016da re PR libstdc++/24645 (Commonize arithmetic inserters/extractors bodies) 
2006-01-02  Paolo Carlini  <pcarlini@suse.de>

	PR libstdc++/24645
	* include/std/std_istream.h (basic_istream<>::_M_extract): New.
	(operator>>(bool&), operator>>(short&), operator>>(unsigned short&),
	operator>>(int&), operator>>(unsigned int&), operator>>(long&),
	operator>>(unsigned long&), operator>>(long long&), operator>>
	(unsigned long long&), operator>>(float&), operator>>(double&),
	operator>>(long double&), operator>>(void*&)): Use it.
	* include/bits/istream.tcc (basic_istream<>::_M_extract): Define.
	* include/std/std_ostream.h (basic_ostream<>::_M_insert): New.
	(operator<<(long), operator<<(unsigned long), operator<<(bool),
	operator<<(short), operator<<(unsigned short), operator<<(int),
	operator<<(unsigned int), operator<<(long long), operator<<
	(unsigned long long), operator<<(double), operator<<(float),
	operator<<(long double), operator<<(const void*): Use it.
	* include/bits/ostream.tcc (basic_ostream<>::_M_insert): Define.
	* src/istream-inst.cc: Add _M_insert instantiations.
	* src/ostream-inst.cc: Add _M_extract instantiations.
	* config/abi/pre/gnu.ver: Export the new symbols @GLIBCXX_3.4.7;
	detail existing @GLIBCXX_3.4 exports of basic_ostream, num_put,
	money_put, etc., symbols to avoid exporting _M_insert symbols
	@GLIBCXX_3.4.

From-SVN: r109236
2006-01-02 09:57:49 +00:00

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// istream classes -*- C++ -*-
// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
// 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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
// 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.
/** @file istream.tcc
* This is an internal header file, included by other library headers.
* You should not attempt to use it directly.
*/
//
// ISO C++ 14882: 27.6.1 Input streams
//
#ifndef _ISTREAM_TCC
#define _ISTREAM_TCC 1
#pragma GCC system_header
#include <locale>
#include <ostream> // For flush()
_GLIBCXX_BEGIN_NAMESPACE(std)
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>::sentry::
sentry(basic_istream<_CharT, _Traits>& __in, bool __noskip) : _M_ok(false)
{
ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
if (__in.good())
{
if (__in.tie())
__in.tie()->flush();
if (!__noskip && (__in.flags() & ios_base::skipws))
{
const __int_type __eof = traits_type::eof();
__streambuf_type* __sb = __in.rdbuf();
__int_type __c = __sb->sgetc();
const __ctype_type& __ct = __check_facet(__in._M_ctype);
while (!traits_type::eq_int_type(__c, __eof)
&& __ct.is(ctype_base::space,
traits_type::to_char_type(__c)))
__c = __sb->snextc();
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 195. Should basic_istream::sentry's constructor ever
// set eofbit?
if (traits_type::eq_int_type(__c, __eof))
__err |= ios_base::eofbit;
}
}
if (__in.good() && __err == ios_base::goodbit)
_M_ok = true;
else
{
__err |= ios_base::failbit;
__in.setstate(__err);
}
}
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
operator>>(__istream_type& (*__pf)(__istream_type&))
{ return __pf(*this); }
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
operator>>(__ios_type& (*__pf)(__ios_type&))
{
__pf(*this);
return *this;
}
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
operator>>(ios_base& (*__pf)(ios_base&))
{
__pf(*this);
return *this;
}
template<typename _CharT, typename _Traits>
template<typename _ValueT>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
_M_extract(_ValueT& __v)
{
sentry __cerb(*this, false);
if (__cerb)
{
ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
try
{
const __num_get_type& __ng = __check_facet(this->_M_num_get);
__ng.get(*this, 0, *this, __err, __v);
}
catch(...)
{ this->_M_setstate(ios_base::badbit); }
if (__err)
this->setstate(__err);
}
return *this;
}
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
operator>>(__streambuf_type* __sbout)
{
ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
sentry __cerb(*this, false);
if (__cerb && __sbout)
{
try
{
if (!__copy_streambufs(this->rdbuf(), __sbout))
__err |= ios_base::failbit;
}
catch(...)
{ this->_M_setstate(ios_base::failbit); }
}
else if (!__sbout)
__err |= ios_base::failbit;
if (__err)
this->setstate(__err);
return *this;
}
template<typename _CharT, typename _Traits>
typename basic_istream<_CharT, _Traits>::int_type
basic_istream<_CharT, _Traits>::
get(void)
{
const int_type __eof = traits_type::eof();
int_type __c = __eof;
_M_gcount = 0;
ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
sentry __cerb(*this, true);
if (__cerb)
{
try
{
__c = this->rdbuf()->sbumpc();
// 27.6.1.1 paragraph 3
if (!traits_type::eq_int_type(__c, __eof))
_M_gcount = 1;
else
__err |= ios_base::eofbit;
}
catch(...)
{ this->_M_setstate(ios_base::badbit); }
}
if (!_M_gcount)
__err |= ios_base::failbit;
if (__err)
this->setstate(__err);
return __c;
}
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
get(char_type& __c)
{
_M_gcount = 0;
ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
sentry __cerb(*this, true);
if (__cerb)
{
try
{
const int_type __cb = this->rdbuf()->sbumpc();
// 27.6.1.1 paragraph 3
if (!traits_type::eq_int_type(__cb, traits_type::eof()))
{
_M_gcount = 1;
__c = traits_type::to_char_type(__cb);
}
else
__err |= ios_base::eofbit;
}
catch(...)
{ this->_M_setstate(ios_base::badbit); }
}
if (!_M_gcount)
__err |= ios_base::failbit;
if (__err)
this->setstate(__err);
return *this;
}
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
get(char_type* __s, streamsize __n, char_type __delim)
{
_M_gcount = 0;
ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
sentry __cerb(*this, true);
if (__cerb)
{
try
{
const int_type __idelim = traits_type::to_int_type(__delim);
const int_type __eof = traits_type::eof();
__streambuf_type* __sb = this->rdbuf();
int_type __c = __sb->sgetc();
while (_M_gcount + 1 < __n
&& !traits_type::eq_int_type(__c, __eof)
&& !traits_type::eq_int_type(__c, __idelim))
{
*__s++ = traits_type::to_char_type(__c);
++_M_gcount;
__c = __sb->snextc();
}
if (traits_type::eq_int_type(__c, __eof))
__err |= ios_base::eofbit;
}
catch(...)
{ this->_M_setstate(ios_base::badbit); }
}
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 243. get and getline when sentry reports failure.
if (__n > 0)
*__s = char_type();
if (!_M_gcount)
__err |= ios_base::failbit;
if (__err)
this->setstate(__err);
return *this;
}
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
get(__streambuf_type& __sb, char_type __delim)
{
_M_gcount = 0;
ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
sentry __cerb(*this, true);
if (__cerb)
{
try
{
const int_type __idelim = traits_type::to_int_type(__delim);
const int_type __eof = traits_type::eof();
__streambuf_type* __this_sb = this->rdbuf();
int_type __c = __this_sb->sgetc();
char_type __c2 = traits_type::to_char_type(__c);
while (!traits_type::eq_int_type(__c, __eof)
&& !traits_type::eq_int_type(__c, __idelim)
&& !traits_type::eq_int_type(__sb.sputc(__c2), __eof))
{
++_M_gcount;
__c = __this_sb->snextc();
__c2 = traits_type::to_char_type(__c);
}
if (traits_type::eq_int_type(__c, __eof))
__err |= ios_base::eofbit;
}
catch(...)
{ this->_M_setstate(ios_base::badbit); }
}
if (!_M_gcount)
__err |= ios_base::failbit;
if (__err)
this->setstate(__err);
return *this;
}
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
getline(char_type* __s, streamsize __n, char_type __delim)
{
_M_gcount = 0;
ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
sentry __cerb(*this, true);
if (__cerb)
{
try
{
const int_type __idelim = traits_type::to_int_type(__delim);
const int_type __eof = traits_type::eof();
__streambuf_type* __sb = this->rdbuf();
int_type __c = __sb->sgetc();
while (_M_gcount + 1 < __n
&& !traits_type::eq_int_type(__c, __eof)
&& !traits_type::eq_int_type(__c, __idelim))
{
*__s++ = traits_type::to_char_type(__c);
__c = __sb->snextc();
++_M_gcount;
}
if (traits_type::eq_int_type(__c, __eof))
__err |= ios_base::eofbit;
else
{
if (traits_type::eq_int_type(__c, __idelim))
{
__sb->sbumpc();
++_M_gcount;
}
else
__err |= ios_base::failbit;
}
}
catch(...)
{ this->_M_setstate(ios_base::badbit); }
}
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 243. get and getline when sentry reports failure.
if (__n > 0)
*__s = char_type();
if (!_M_gcount)
__err |= ios_base::failbit;
if (__err)
this->setstate(__err);
return *this;
}
// We provide three overloads, since the first two are much simpler
// than the general case. Also, the latter two can thus adopt the
// same "batchy" strategy used by getline above.
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
ignore(void)
{
_M_gcount = 0;
sentry __cerb(*this, true);
if (__cerb)
{
ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
try
{
const int_type __eof = traits_type::eof();
__streambuf_type* __sb = this->rdbuf();
if (traits_type::eq_int_type(__sb->sbumpc(), __eof))
__err |= ios_base::eofbit;
else
_M_gcount = 1;
}
catch(...)
{ this->_M_setstate(ios_base::badbit); }
if (__err)
this->setstate(__err);
}
return *this;
}
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
ignore(streamsize __n)
{
_M_gcount = 0;
sentry __cerb(*this, true);
if (__cerb && __n > 0)
{
ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
try
{
const int_type __eof = traits_type::eof();
__streambuf_type* __sb = this->rdbuf();
int_type __c = __sb->sgetc();
// N.B. On LFS-enabled platforms streamsize is still 32 bits
// wide: if we want to implement the standard mandated behavior
// for n == max() (see 27.6.1.3/24) we are at risk of signed
// integer overflow: thus these contortions. Also note that,
// by definition, when more than 2G chars are actually ignored,
// _M_gcount (the return value of gcount, that is) cannot be
// really correct, being unavoidably too small.
bool __large_ignore = false;
while (true)
{
while (_M_gcount < __n
&& !traits_type::eq_int_type(__c, __eof))
{
++_M_gcount;
__c = __sb->snextc();
}
if (__n == numeric_limits<streamsize>::max()
&& !traits_type::eq_int_type(__c, __eof))
{
_M_gcount = numeric_limits<streamsize>::min();
__large_ignore = true;
}
else
break;
}
if (__large_ignore)
_M_gcount = numeric_limits<streamsize>::max();
if (traits_type::eq_int_type(__c, __eof))
__err |= ios_base::eofbit;
}
catch(...)
{ this->_M_setstate(ios_base::badbit); }
if (__err)
this->setstate(__err);
}
return *this;
}
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
ignore(streamsize __n, int_type __delim)
{
_M_gcount = 0;
sentry __cerb(*this, true);
if (__cerb && __n > 0)
{
ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
try
{
const int_type __eof = traits_type::eof();
__streambuf_type* __sb = this->rdbuf();
int_type __c = __sb->sgetc();
// See comment above.
bool __large_ignore = false;
while (true)
{
while (_M_gcount < __n
&& !traits_type::eq_int_type(__c, __eof)
&& !traits_type::eq_int_type(__c, __delim))
{
++_M_gcount;
__c = __sb->snextc();
}
if (__n == numeric_limits<streamsize>::max()
&& !traits_type::eq_int_type(__c, __eof)
&& !traits_type::eq_int_type(__c, __delim))
{
_M_gcount = numeric_limits<streamsize>::min();
__large_ignore = true;
}
else
break;
}
if (__large_ignore)
_M_gcount = numeric_limits<streamsize>::max();
if (traits_type::eq_int_type(__c, __eof))
__err |= ios_base::eofbit;
else if (traits_type::eq_int_type(__c, __delim))
{
if (_M_gcount < numeric_limits<streamsize>::max())
++_M_gcount;
__sb->sbumpc();
}
}
catch(...)
{ this->_M_setstate(ios_base::badbit); }
if (__err)
this->setstate(__err);
}
return *this;
}
template<typename _CharT, typename _Traits>
typename basic_istream<_CharT, _Traits>::int_type
basic_istream<_CharT, _Traits>::
peek(void)
{
int_type __c = traits_type::eof();
_M_gcount = 0;
sentry __cerb(*this, true);
if (__cerb)
{
ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
try
{
__c = this->rdbuf()->sgetc();
if (traits_type::eq_int_type(__c, traits_type::eof()))
__err |= ios_base::eofbit;
}
catch(...)
{ this->_M_setstate(ios_base::badbit); }
if (__err)
this->setstate(__err);
}
return __c;
}
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
read(char_type* __s, streamsize __n)
{
_M_gcount = 0;
sentry __cerb(*this, true);
if (__cerb)
{
ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
try
{
_M_gcount = this->rdbuf()->sgetn(__s, __n);
if (_M_gcount != __n)
__err |= (ios_base::eofbit | ios_base::failbit);
}
catch(...)
{ this->_M_setstate(ios_base::badbit); }
if (__err)
this->setstate(__err);
}
return *this;
}
template<typename _CharT, typename _Traits>
streamsize
basic_istream<_CharT, _Traits>::
readsome(char_type* __s, streamsize __n)
{
_M_gcount = 0;
sentry __cerb(*this, true);
if (__cerb)
{
ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
try
{
// Cannot compare int_type with streamsize generically.
const streamsize __num = this->rdbuf()->in_avail();
if (__num > 0)
_M_gcount = this->rdbuf()->sgetn(__s, std::min(__num, __n));
else if (__num == -1)
__err |= ios_base::eofbit;
}
catch(...)
{ this->_M_setstate(ios_base::badbit); }
if (__err)
this->setstate(__err);
}
return _M_gcount;
}
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
putback(char_type __c)
{
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 60. What is a formatted input function?
_M_gcount = 0;
sentry __cerb(*this, true);
if (__cerb)
{
ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
try
{
const int_type __eof = traits_type::eof();
__streambuf_type* __sb = this->rdbuf();
if (!__sb
|| traits_type::eq_int_type(__sb->sputbackc(__c), __eof))
__err |= ios_base::badbit;
}
catch(...)
{ this->_M_setstate(ios_base::badbit); }
if (__err)
this->setstate(__err);
}
return *this;
}
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
unget(void)
{
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 60. What is a formatted input function?
_M_gcount = 0;
sentry __cerb(*this, true);
if (__cerb)
{
ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
try
{
const int_type __eof = traits_type::eof();
__streambuf_type* __sb = this->rdbuf();
if (!__sb
|| traits_type::eq_int_type(__sb->sungetc(), __eof))
__err |= ios_base::badbit;
}
catch(...)
{ this->_M_setstate(ios_base::badbit); }
if (__err)
this->setstate(__err);
}
return *this;
}
template<typename _CharT, typename _Traits>
int
basic_istream<_CharT, _Traits>::
sync(void)
{
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// DR60. Do not change _M_gcount.
int __ret = -1;
sentry __cerb(*this, true);
if (__cerb)
{
ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
try
{
__streambuf_type* __sb = this->rdbuf();
if (__sb)
{
if (__sb->pubsync() == -1)
__err |= ios_base::badbit;
else
__ret = 0;
}
}
catch(...)
{ this->_M_setstate(ios_base::badbit); }
if (__err)
this->setstate(__err);
}
return __ret;
}
template<typename _CharT, typename _Traits>
typename basic_istream<_CharT, _Traits>::pos_type
basic_istream<_CharT, _Traits>::
tellg(void)
{
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// DR60. Do not change _M_gcount.
pos_type __ret = pos_type(-1);
try
{
if (!this->fail())
__ret = this->rdbuf()->pubseekoff(0, ios_base::cur, ios_base::in);
}
catch(...)
{ this->_M_setstate(ios_base::badbit); }
return __ret;
}
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
seekg(pos_type __pos)
{
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// DR60. Do not change _M_gcount.
ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
try
{
if (!this->fail())
{
// 136. seekp, seekg setting wrong streams?
const pos_type __p = this->rdbuf()->pubseekpos(__pos,
ios_base::in);
// 129. Need error indication from seekp() and seekg()
if (__p == pos_type(off_type(-1)))
__err |= ios_base::failbit;
}
}
catch(...)
{ this->_M_setstate(ios_base::badbit); }
if (__err)
this->setstate(__err);
return *this;
}
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::
seekg(off_type __off, ios_base::seekdir __dir)
{
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// DR60. Do not change _M_gcount.
ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
try
{
if (!this->fail())
{
// 136. seekp, seekg setting wrong streams?
const pos_type __p = this->rdbuf()->pubseekoff(__off, __dir,
ios_base::in);
// 129. Need error indication from seekp() and seekg()
if (__p == pos_type(off_type(-1)))
__err |= ios_base::failbit;
}
}
catch(...)
{ this->_M_setstate(ios_base::badbit); }
if (__err)
this->setstate(__err);
return *this;
}
// 27.6.1.2.3 Character extraction templates
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
operator>>(basic_istream<_CharT, _Traits>& __in, _CharT& __c)
{
typedef basic_istream<_CharT, _Traits> __istream_type;
typedef typename __istream_type::int_type __int_type;
typename __istream_type::sentry __cerb(__in, false);
if (__cerb)
{
ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
try
{
const __int_type __cb = __in.rdbuf()->sbumpc();
if (!_Traits::eq_int_type(__cb, _Traits::eof()))
__c = _Traits::to_char_type(__cb);
else
__err |= (ios_base::eofbit | ios_base::failbit);
}
catch(...)
{ __in._M_setstate(ios_base::badbit); }
if (__err)
__in.setstate(__err);
}
return __in;
}
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
operator>>(basic_istream<_CharT, _Traits>& __in, _CharT* __s)
{
typedef basic_istream<_CharT, _Traits> __istream_type;
typedef typename __istream_type::__streambuf_type __streambuf_type;
typedef typename _Traits::int_type int_type;
typedef _CharT char_type;
typedef ctype<_CharT> __ctype_type;
streamsize __extracted = 0;
ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
typename __istream_type::sentry __cerb(__in, false);
if (__cerb)
{
try
{
// Figure out how many characters to extract.
streamsize __num = __in.width();
if (__num <= 0)
__num = numeric_limits<streamsize>::max();
const __ctype_type& __ct = use_facet<__ctype_type>(__in.getloc());
const int_type __eof = _Traits::eof();
__streambuf_type* __sb = __in.rdbuf();
int_type __c = __sb->sgetc();
while (__extracted < __num - 1
&& !_Traits::eq_int_type(__c, __eof)
&& !__ct.is(ctype_base::space,
_Traits::to_char_type(__c)))
{
*__s++ = _Traits::to_char_type(__c);
++__extracted;
__c = __sb->snextc();
}
if (_Traits::eq_int_type(__c, __eof))
__err |= ios_base::eofbit;
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 68. Extractors for char* should store null at end
*__s = char_type();
__in.width(0);
}
catch(...)
{ __in._M_setstate(ios_base::badbit); }
}
if (!__extracted)
__err |= ios_base::failbit;
if (__err)
__in.setstate(__err);
return __in;
}
// 27.6.1.4 Standard basic_istream manipulators
template<typename _CharT, typename _Traits>
basic_istream<_CharT,_Traits>&
ws(basic_istream<_CharT,_Traits>& __in)
{
typedef basic_istream<_CharT, _Traits> __istream_type;
typedef typename __istream_type::__streambuf_type __streambuf_type;
typedef typename __istream_type::__ctype_type __ctype_type;
typedef typename __istream_type::int_type __int_type;
const __ctype_type& __ct = use_facet<__ctype_type>(__in.getloc());
const __int_type __eof = _Traits::eof();
__streambuf_type* __sb = __in.rdbuf();
__int_type __c = __sb->sgetc();
while (!_Traits::eq_int_type(__c, __eof)
&& __ct.is(ctype_base::space, _Traits::to_char_type(__c)))
__c = __sb->snextc();
if (_Traits::eq_int_type(__c, __eof))
__in.setstate(ios_base::eofbit);
return __in;
}
// 21.3.7.9 basic_string::getline and operators
template<typename _CharT, typename _Traits, typename _Alloc>
basic_istream<_CharT, _Traits>&
operator>>(basic_istream<_CharT, _Traits>& __in,
basic_string<_CharT, _Traits, _Alloc>& __str)
{
typedef basic_istream<_CharT, _Traits> __istream_type;
typedef typename __istream_type::int_type __int_type;
typedef typename __istream_type::__streambuf_type __streambuf_type;
typedef typename __istream_type::__ctype_type __ctype_type;
typedef basic_string<_CharT, _Traits, _Alloc> __string_type;
typedef typename __string_type::size_type __size_type;
__size_type __extracted = 0;
ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
typename __istream_type::sentry __cerb(__in, false);
if (__cerb)
{
try
{
// Avoid reallocation for common case.
__str.erase();
_CharT __buf[128];
__size_type __len = 0;
const streamsize __w = __in.width();
const __size_type __n = __w > 0 ? static_cast<__size_type>(__w)
: __str.max_size();
const __ctype_type& __ct = use_facet<__ctype_type>(__in.getloc());
const __int_type __eof = _Traits::eof();
__streambuf_type* __sb = __in.rdbuf();
__int_type __c = __sb->sgetc();
while (__extracted < __n
&& !_Traits::eq_int_type(__c, __eof)
&& !__ct.is(ctype_base::space, _Traits::to_char_type(__c)))
{
if (__len == sizeof(__buf) / sizeof(_CharT))
{
__str.append(__buf, sizeof(__buf) / sizeof(_CharT));
__len = 0;
}
__buf[__len++] = _Traits::to_char_type(__c);
++__extracted;
__c = __sb->snextc();
}
__str.append(__buf, __len);
if (_Traits::eq_int_type(__c, __eof))
__err |= ios_base::eofbit;
__in.width(0);
}
catch(...)
{
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 91. Description of operator>> and getline() for string<>
// might cause endless loop
__in._M_setstate(ios_base::badbit);
}
}
// 211. operator>>(istream&, string&) doesn't set failbit
if (!__extracted)
__err |= ios_base::failbit;
if (__err)
__in.setstate(__err);
return __in;
}
template<typename _CharT, typename _Traits, typename _Alloc>
basic_istream<_CharT, _Traits>&
getline(basic_istream<_CharT, _Traits>& __in,
basic_string<_CharT, _Traits, _Alloc>& __str, _CharT __delim)
{
typedef basic_istream<_CharT, _Traits> __istream_type;
typedef typename __istream_type::int_type __int_type;
typedef typename __istream_type::__streambuf_type __streambuf_type;
typedef typename __istream_type::__ctype_type __ctype_type;
typedef basic_string<_CharT, _Traits, _Alloc> __string_type;
typedef typename __string_type::size_type __size_type;
__size_type __extracted = 0;
const __size_type __n = __str.max_size();
ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
typename __istream_type::sentry __cerb(__in, true);
if (__cerb)
{
try
{
__str.erase();
const __int_type __idelim = _Traits::to_int_type(__delim);
const __int_type __eof = _Traits::eof();
__streambuf_type* __sb = __in.rdbuf();
__int_type __c = __sb->sgetc();
while (__extracted < __n
&& !_Traits::eq_int_type(__c, __eof)
&& !_Traits::eq_int_type(__c, __idelim))
{
__str += _Traits::to_char_type(__c);
++__extracted;
__c = __sb->snextc();
}
if (_Traits::eq_int_type(__c, __eof))
__err |= ios_base::eofbit;
else if (_Traits::eq_int_type(__c, __idelim))
{
++__extracted;
__sb->sbumpc();
}
else
__err |= ios_base::failbit;
}
catch(...)
{
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 91. Description of operator>> and getline() for string<>
// might cause endless loop
__in._M_setstate(ios_base::badbit);
}
}
if (!__extracted)
__err |= ios_base::failbit;
if (__err)
__in.setstate(__err);
return __in;
}
template<class _CharT, class _Traits, class _Alloc>
inline basic_istream<_CharT,_Traits>&
getline(basic_istream<_CharT, _Traits>& __in,
basic_string<_CharT,_Traits,_Alloc>& __str)
{ return getline(__in, __str, __in.widen('\n')); }
// Inhibit implicit instantiations for required instantiations,
// which are defined via explicit instantiations elsewhere.
// NB: This syntax is a GNU extension.
#if _GLIBCXX_EXTERN_TEMPLATE
extern template class basic_istream<char>;
extern template istream& ws(istream&);
extern template istream& operator>>(istream&, char&);
extern template istream& operator>>(istream&, char*);
extern template istream& operator>>(istream&, unsigned char&);
extern template istream& operator>>(istream&, signed char&);
extern template istream& operator>>(istream&, unsigned char*);
extern template istream& operator>>(istream&, signed char*);
extern template class basic_iostream<char>;
#ifdef _GLIBCXX_USE_WCHAR_T
extern template class basic_istream<wchar_t>;
extern template wistream& ws(wistream&);
extern template wistream& operator>>(wistream&, wchar_t&);
extern template wistream& operator>>(wistream&, wchar_t*);
extern template class basic_iostream<wchar_t>;
#endif
#endif
_GLIBCXX_END_NAMESPACE
#endif
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