// istream classes -*- C++ -*-// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,// 2006, 2007// 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 <cxxabi-forced.h>_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 && bool(__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>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(__cxxabiv1::__forced_unwind&){this->_M_setstate(ios_base::badbit);__throw_exception_again;}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>>(short& __n){// _GLIBCXX_RESOLVE_LIB_DEFECTS// 118. basic_istream uses nonexistent num_get member functions.long __l;_M_extract(__l);if (!this->fail()){if (__gnu_cxx::__numeric_traits<short>::__min <= __l&& __l <= __gnu_cxx::__numeric_traits<short>::__max)__n = short(__l);elsethis->setstate(ios_base::failbit);}return *this;}template<typename _CharT, typename _Traits>basic_istream<_CharT, _Traits>&basic_istream<_CharT, _Traits>::operator>>(int& __n){// _GLIBCXX_RESOLVE_LIB_DEFECTS// 118. basic_istream uses nonexistent num_get member functions.long __l;_M_extract(__l);if (!this->fail()){if (__gnu_cxx::__numeric_traits<int>::__min <= __l&& __l <= __gnu_cxx::__numeric_traits<int>::__max)__n = int(__l);elsethis->setstate(ios_base::failbit);}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{bool __ineof;if (!__copy_streambufs_eof(this->rdbuf(), __sbout, __ineof))__err |= ios_base::failbit;if (__ineof)__err |= ios_base::eofbit;}catch(__cxxabiv1::__forced_unwind&){this->_M_setstate(ios_base::failbit);__throw_exception_again;}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_typebasic_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 3if (!traits_type::eq_int_type(__c, __eof))_M_gcount = 1;else__err |= ios_base::eofbit;}catch(__cxxabiv1::__forced_unwind&){this->_M_setstate(ios_base::badbit);__throw_exception_again;}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 3if (!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(__cxxabiv1::__forced_unwind&){this->_M_setstate(ios_base::badbit);__throw_exception_again;}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(__cxxabiv1::__forced_unwind&){this->_M_setstate(ios_base::badbit);__throw_exception_again;}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(__cxxabiv1::__forced_unwind&){this->_M_setstate(ios_base::badbit);__throw_exception_again;}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(__cxxabiv1::__forced_unwind&){this->_M_setstate(ios_base::badbit);__throw_exception_again;}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(__cxxabiv1::__forced_unwind&){this->_M_setstate(ios_base::badbit);__throw_exception_again;}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 == __gnu_cxx::__numeric_traits<streamsize>::__max&& !traits_type::eq_int_type(__c, __eof)){_M_gcount =__gnu_cxx::__numeric_traits<streamsize>::__min;__large_ignore = true;}elsebreak;}if (__large_ignore)_M_gcount = __gnu_cxx::__numeric_traits<streamsize>::__max;if (traits_type::eq_int_type(__c, __eof))__err |= ios_base::eofbit;}catch(__cxxabiv1::__forced_unwind&){this->_M_setstate(ios_base::badbit);__throw_exception_again;}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 == __gnu_cxx::__numeric_traits<streamsize>::__max&& !traits_type::eq_int_type(__c, __eof)&& !traits_type::eq_int_type(__c, __delim)){_M_gcount =__gnu_cxx::__numeric_traits<streamsize>::__min;__large_ignore = true;}elsebreak;}if (__large_ignore)_M_gcount = __gnu_cxx::__numeric_traits<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< __gnu_cxx::__numeric_traits<streamsize>::__max)++_M_gcount;__sb->sbumpc();}}catch(__cxxabiv1::__forced_unwind&){this->_M_setstate(ios_base::badbit);__throw_exception_again;}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_typebasic_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(__cxxabiv1::__forced_unwind&){this->_M_setstate(ios_base::badbit);__throw_exception_again;}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(__cxxabiv1::__forced_unwind&){this->_M_setstate(ios_base::badbit);__throw_exception_again;}catch(...){ this->_M_setstate(ios_base::badbit); }if (__err)this->setstate(__err);}return *this;}template<typename _CharT, typename _Traits>streamsizebasic_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(__cxxabiv1::__forced_unwind&){this->_M_setstate(ios_base::badbit);__throw_exception_again;}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(__cxxabiv1::__forced_unwind&){this->_M_setstate(ios_base::badbit);__throw_exception_again;}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(__cxxabiv1::__forced_unwind&){this->_M_setstate(ios_base::badbit);__throw_exception_again;}catch(...){ this->_M_setstate(ios_base::badbit); }if (__err)this->setstate(__err);}return *this;}template<typename _CharT, typename _Traits>intbasic_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(__cxxabiv1::__forced_unwind&){this->_M_setstate(ios_base::badbit);__throw_exception_again;}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_typebasic_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(__cxxabiv1::__forced_unwind&){this->_M_setstate(ios_base::badbit);__throw_exception_again;}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(__cxxabiv1::__forced_unwind&){this->_M_setstate(ios_base::badbit);__throw_exception_again;}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(__cxxabiv1::__forced_unwind&){this->_M_setstate(ios_base::badbit);__throw_exception_again;}catch(...){ this->_M_setstate(ios_base::badbit); }if (__err)this->setstate(__err);return *this;}// 27.6.1.2.3 Character extraction templatestemplate<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(__cxxabiv1::__forced_unwind&){__in._M_setstate(ios_base::badbit);__throw_exception_again;}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 basic_streambuf<_CharT, _Traits> __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 = __gnu_cxx::__numeric_traits<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(__cxxabiv1::__forced_unwind&){__in._M_setstate(ios_base::badbit);__throw_exception_again;}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 manipulatorstemplate<typename _CharT, typename _Traits>basic_istream<_CharT, _Traits>&ws(basic_istream<_CharT, _Traits>& __in){typedef basic_istream<_CharT, _Traits> __istream_type;typedef basic_streambuf<_CharT, _Traits> __streambuf_type;typedef typename __istream_type::int_type __int_type;typedef ctype<_CharT> __ctype_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;}// Inhibit implicit instantiations for required instantiations,// which are defined via explicit instantiations elsewhere.// NB: This syntax is a GNU extension.#if _GLIBCXX_EXTERN_TEMPLATEextern 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 istream& istream::_M_extract(unsigned short&);extern template istream& istream::_M_extract(unsigned int&);extern template istream& istream::_M_extract(long&);extern template istream& istream::_M_extract(unsigned long&);extern template istream& istream::_M_extract(bool&);#ifdef _GLIBCXX_USE_LONG_LONGextern template istream& istream::_M_extract(long long&);extern template istream& istream::_M_extract(unsigned long long&);#endifextern template istream& istream::_M_extract(float&);extern template istream& istream::_M_extract(double&);extern template istream& istream::_M_extract(long double&);extern template istream& istream::_M_extract(void*&);extern template class basic_iostream<char>;#ifdef _GLIBCXX_USE_WCHAR_Textern 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 wistream& wistream::_M_extract(unsigned short&);extern template wistream& wistream::_M_extract(unsigned int&);extern template wistream& wistream::_M_extract(long&);extern template wistream& wistream::_M_extract(unsigned long&);extern template wistream& wistream::_M_extract(bool&);#ifdef _GLIBCXX_USE_LONG_LONGextern template wistream& wistream::_M_extract(long long&);extern template wistream& wistream::_M_extract(unsigned long long&);#endifextern template wistream& wistream::_M_extract(float&);extern template wistream& wistream::_M_extract(double&);extern template wistream& wistream::_M_extract(long double&);extern template wistream& wistream::_M_extract(void*&);extern template class basic_iostream<wchar_t>;#endif#endif_GLIBCXX_END_NAMESPACE#endif