basic_ios.tcc

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00001 // basic_ios member functions -*- C++ -*-
00002 
00003 // Copyright (C) 1999, 2001, 2002, 2003, 2004, 2005
00004 // Free Software Foundation, Inc.
00005 //
00006 // This file is part of the GNU ISO C++ Library.  This library is free
00007 // software; you can redistribute it and/or modify it under the
00008 // terms of the GNU General Public License as published by the
00009 // Free Software Foundation; either version 2, or (at your option)
00010 // any later version.
00011 
00012 // This library is distributed in the hope that it will be useful,
00013 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00014 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00015 // GNU General Public License for more details.
00016 
00017 // You should have received a copy of the GNU General Public License along
00018 // with this library; see the file COPYING.  If not, write to the Free
00019 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
00020 // USA.
00021 
00022 // As a special exception, you may use this file as part of a free software
00023 // library without restriction.  Specifically, if other files instantiate
00024 // templates or use macros or inline functions from this file, or you compile
00025 // this file and link it with other files to produce an executable, this
00026 // file does not by itself cause the resulting executable to be covered by
00027 // the GNU General Public License.  This exception does not however
00028 // invalidate any other reasons why the executable file might be covered by
00029 // the GNU General Public License.
00030 
00031 /** @file basic_ios.tcc
00032  *  This is an internal header file, included by other library headers.
00033  *  You should not attempt to use it directly.
00034  */
00035 
00036 #ifndef _BASIC_IOS_TCC
00037 #define _BASIC_IOS_TCC 1
00038 
00039 #pragma GCC system_header
00040 
00041 _GLIBCXX_BEGIN_NAMESPACE(std)
00042 
00043   template<typename _CharT, typename _Traits>
00044     void
00045     basic_ios<_CharT, _Traits>::clear(iostate __state)
00046     {
00047       if (this->rdbuf())
00048     _M_streambuf_state = __state;
00049       else
00050       _M_streambuf_state = __state | badbit;
00051       if (this->exceptions() & this->rdstate())
00052     __throw_ios_failure(__N("basic_ios::clear"));
00053     }
00054 
00055   template<typename _CharT, typename _Traits>
00056     basic_streambuf<_CharT, _Traits>*
00057     basic_ios<_CharT, _Traits>::rdbuf(basic_streambuf<_CharT, _Traits>* __sb)
00058     {
00059       basic_streambuf<_CharT, _Traits>* __old = _M_streambuf;
00060       _M_streambuf = __sb;
00061       this->clear();
00062       return __old;
00063     }
00064 
00065   template<typename _CharT, typename _Traits>
00066     basic_ios<_CharT, _Traits>&
00067     basic_ios<_CharT, _Traits>::copyfmt(const basic_ios& __rhs)
00068     {
00069       // _GLIBCXX_RESOLVE_LIB_DEFECTS
00070       // 292. effects of a.copyfmt (a)
00071       if (this != &__rhs)
00072     {
00073       // Per 27.1.1, do not call imbue, yet must trash all caches
00074       // associated with imbue()
00075 
00076       // Alloc any new word array first, so if it fails we have "rollback".
00077       _Words* __words = (__rhs._M_word_size <= _S_local_word_size) ?
00078                          _M_local_word : new _Words[__rhs._M_word_size];
00079 
00080       // Bump refs before doing callbacks, for safety.
00081       _Callback_list* __cb = __rhs._M_callbacks;
00082       if (__cb)
00083         __cb->_M_add_reference();
00084       _M_call_callbacks(erase_event);
00085       if (_M_word != _M_local_word)
00086         {
00087           delete [] _M_word;
00088           _M_word = 0;
00089         }
00090       _M_dispose_callbacks();
00091 
00092       // NB: Don't want any added during above.
00093       _M_callbacks = __cb;
00094       for (int __i = 0; __i < __rhs._M_word_size; ++__i)
00095         __words[__i] = __rhs._M_word[__i];
00096       _M_word = __words;
00097       _M_word_size = __rhs._M_word_size;
00098 
00099       this->flags(__rhs.flags());
00100       this->width(__rhs.width());
00101       this->precision(__rhs.precision());
00102       this->tie(__rhs.tie());
00103       this->fill(__rhs.fill());
00104       _M_ios_locale = __rhs.getloc();
00105       _M_cache_locale(_M_ios_locale);
00106 
00107       _M_call_callbacks(copyfmt_event);
00108 
00109       // The next is required to be the last assignment.
00110       this->exceptions(__rhs.exceptions());
00111     }
00112       return *this;
00113     }
00114 
00115   template<typename _CharT, typename _Traits>
00116     char
00117     basic_ios<_CharT, _Traits>::narrow(char_type __c, char __dfault) const
00118     { return __check_facet(_M_ctype).narrow(__c, __dfault); }
00119 
00120   template<typename _CharT, typename _Traits>
00121     _CharT
00122     basic_ios<_CharT, _Traits>::widen(char __c) const
00123     { return __check_facet(_M_ctype).widen(__c); }
00124 
00125   // Locales:
00126   template<typename _CharT, typename _Traits>
00127     locale
00128     basic_ios<_CharT, _Traits>::imbue(const locale& __loc)
00129     {
00130       locale __old(this->getloc());
00131       ios_base::imbue(__loc);
00132       _M_cache_locale(__loc);
00133       if (this->rdbuf() != 0)
00134     this->rdbuf()->pubimbue(__loc);
00135       return __old;
00136     }
00137 
00138   template<typename _CharT, typename _Traits>
00139     void
00140     basic_ios<_CharT, _Traits>::init(basic_streambuf<_CharT, _Traits>* __sb)
00141     {
00142       // NB: This may be called more than once on the same object.
00143       ios_base::_M_init();
00144 
00145       // Cache locale data and specific facets used by iostreams.
00146       _M_cache_locale(_M_ios_locale);
00147 
00148       // NB: The 27.4.4.1 Postconditions Table specifies requirements
00149       // after basic_ios::init() has been called. As part of this,
00150       // fill() must return widen(' ') any time after init() has been
00151       // called, which needs an imbued ctype facet of char_type to
00152       // return without throwing an exception. Unfortunately,
00153       // ctype<char_type> is not necessarily a required facet, so
00154       // streams with char_type != [char, wchar_t] will not have it by
00155       // default. Because of this, the correct value for _M_fill is
00156       // constructed on the first call of fill(). That way,
00157       // unformatted input and output with non-required basic_ios
00158       // instantiations is possible even without imbuing the expected
00159       // ctype<char_type> facet.
00160       _M_fill = _CharT();
00161       _M_fill_init = false;
00162 
00163       _M_tie = 0;
00164       _M_exception = goodbit;
00165       _M_streambuf = __sb;
00166       _M_streambuf_state = __sb ? goodbit : badbit;
00167     }
00168 
00169   template<typename _CharT, typename _Traits>
00170     void
00171     basic_ios<_CharT, _Traits>::_M_cache_locale(const locale& __loc)
00172     {
00173       if (__builtin_expect(has_facet<__ctype_type>(__loc), true))
00174     _M_ctype = &use_facet<__ctype_type>(__loc);
00175       else
00176     _M_ctype = 0;
00177 
00178       if (__builtin_expect(has_facet<__num_put_type>(__loc), true))
00179     _M_num_put = &use_facet<__num_put_type>(__loc);
00180       else
00181     _M_num_put = 0;
00182 
00183       if (__builtin_expect(has_facet<__num_get_type>(__loc), true))
00184     _M_num_get = &use_facet<__num_get_type>(__loc);
00185       else
00186     _M_num_get = 0;
00187     }
00188 
00189   // Inhibit implicit instantiations for required instantiations,
00190   // which are defined via explicit instantiations elsewhere.
00191   // NB:  This syntax is a GNU extension.
00192 #if _GLIBCXX_EXTERN_TEMPLATE
00193   extern template class basic_ios<char>;
00194 
00195 #ifdef _GLIBCXX_USE_WCHAR_T
00196   extern template class basic_ios<wchar_t>;
00197 #endif
00198 #endif
00199 
00200 _GLIBCXX_END_NAMESPACE
00201 
00202 #endif

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