libstdc++-v3/include/bits/basic_ios.tcc

   1 // basic_ios locale and locale-related member functions -*- C++ -*-
   2
   3 // Copyright (C) 1999, 2001, 2002 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 2, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING.  If not, write to the Free
  18 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  19 // USA.
  20
  21 // As a special exception, you may use this file as part of a free software
  22 // library without restriction.  Specifically, if other files instantiate
  23 // templates or use macros or inline functions from this file, or you compile
  24 // this file and link it with other files to produce an executable, this
  25 // file does not by itself cause the resulting executable to be covered by
  26 // the GNU General Public License.  This exception does not however
  27 // invalidate any other reasons why the executable file might be covered by
  28 // the GNU General Public License.
  29
  30 #ifndef _CPP_BITS_BASICIOS_TCC
  31 #define _CPP_BITS_BASICIOS_TCC 1
  32
  33 #pragma GCC system_header
  34
  35 namespace std
  36 {
  37   template<typename _CharT, typename _Traits>
  38     void
  39     basic_ios<_CharT, _Traits>::clear(iostate __state)
  40     {
  41       if (this->rdbuf())
  42         _M_streambuf_state = __state;
  43       else
  44           _M_streambuf_state = __state | badbit;
  45       if ((this->rdstate() & this->exceptions()))
  46         __throw_ios_failure("basic_ios::clear(iostate) caused exception");
  47     }
  48
  49   template<typename _CharT, typename _Traits>
  50     basic_streambuf<_CharT, _Traits>*
  51     basic_ios<_CharT, _Traits>::rdbuf(basic_streambuf<_CharT, _Traits>* __sb)
  52     {
  53       basic_streambuf<_CharT, _Traits>* __old = _M_streambuf;
  54       _M_streambuf = __sb;
  55       this->clear();
  56       return __old;
  57     }
  58
  59   template<typename _CharT, typename _Traits>
  60     basic_ios<_CharT, _Traits>&
  61     basic_ios<_CharT, _Traits>::copyfmt(const basic_ios& __rhs)
  62     {
  63       // Per 27.1.1.1, do not call imbue, yet must trash all caches
  64       // associated with imbue()
  65
  66       // Alloc any new word array first, so if it fails we have "rollback".
  67       _Words* __words = (__rhs._M_word_size <= _S_local_word_size) ?
  68         _M_local_word : new _Words[__rhs._M_word_size];
  69
  70       // Bump refs before doing callbacks, for safety.
  71       _Callback_list* __cb = __rhs._M_callbacks;
  72       if (__cb)
  73         __cb->_M_add_reference();
  74       _M_call_callbacks(erase_event);
  75       if (_M_word != _M_local_word)
  76         {
  77           delete [] _M_word;
  78           _M_word = 0;
  79         }
  80       _M_dispose_callbacks();
  81
  82       _M_callbacks = __cb;  // NB: Don't want any added during above.
  83       for (int __i = 0; __i < __rhs._M_word_size; ++__i)
  84         __words[__i] = __rhs._M_word[__i];
  85       if (_M_word != _M_local_word)
  86         {
  87           delete [] _M_word;
  88           _M_word = 0;
  89         }
  90       _M_word = __words;
  91       _M_word_size = __rhs._M_word_size;
  92
  93       this->flags(__rhs.flags());
  94       this->width(__rhs.width());
  95       this->precision(__rhs.precision());
  96       this->tie(__rhs.tie());
  97       this->fill(__rhs.fill());
  98       // The next is required to be the last assignment.
  99       this->exceptions(__rhs.exceptions());
 100
 101       _M_call_callbacks(copyfmt_event);
 102       return *this;
 103     }
 104
 105   template<typename _CharT, typename _Traits>
 106     char
 107     basic_ios<_CharT, _Traits>::narrow(char_type __c, char __dfault) const
 108     {
 109       char __ret = __dfault;
 110       if (_M_check_facet(_M_fctype))
 111         __ret = _M_fctype->narrow(__c, __dfault);
 112       return __ret;
 113     }
 114
 115   template<typename _CharT, typename _Traits>
 116     _CharT
 117     basic_ios<_CharT, _Traits>::widen(char __c) const
 118     {
 119       char_type __ret = char_type();
 120       if (_M_check_facet(_M_fctype))
 121         __ret = _M_fctype->widen(__c);
 122       return __ret;
 123     }
 124
 125   // Locales:
 126   template<typename _CharT, typename _Traits>
 127     locale
 128     basic_ios<_CharT, _Traits>::imbue(const locale& __loc)
 129     {
 130       locale __old(this->getloc());
 131       ios_base::imbue(__loc);
 132       _M_cache_facets(__loc);
 133       if (this->rdbuf() != 0)
 134         this->rdbuf()->pubimbue(__loc);
 135       return __old;
 136     }
 137
 138   template<typename _CharT, typename _Traits>
 139     void
 140     basic_ios<_CharT, _Traits>::init(basic_streambuf<_CharT, _Traits>* __sb)
 141     {
 142       // NB: This may be called more than once on the same object.
 143       ios_base::_M_init();
 144       _M_cache_facets(_M_ios_locale);
 145       _M_tie = 0;
 146
 147       // NB: The 27.4.4.1 Postconditions Table specifies requirements
 148       // after basic_ios::init() has been called. As part of this,
 149       // fill() must return widen(' ') any time after init() has been
 150       // called, which needs an imbued ctype facet of char_type to
 151       // return without throwing an exception. Unfortunately,
 152       // ctype<char_type> is not necessarily a required facet, so
 153       // streams with char_type != [char, wchar_t] will not have it by
 154       // default. Because of this, the correct value for _M_fill is
 155       // constructed on the first call of fill(). That way,
 156       // unformatted input and output with non-required basic_ios
 157       // instantiations is possible even without imbuing the expected
 158       // ctype<char_type> facet.
 159       _M_fill = 0;
 160       _M_fill_init = false;
 161
 162       _M_exception = goodbit;
 163       _M_streambuf = __sb;
 164       _M_streambuf_state = __sb ? goodbit : badbit;
 165     }
 166
 167   template<typename _CharT, typename _Traits>
 168     void
 169     basic_ios<_CharT, _Traits>::_M_cache_facets(const locale& __loc)
 170     {
 171       if (has_facet<__ctype_type>(__loc))
 172         _M_fctype = &use_facet<__ctype_type>(__loc);
 173       else
 174         _M_fctype = 0;
 175       // Should be filled in by ostream and istream, respectively.
 176       if (has_facet<__numput_type>(__loc))
 177         _M_fnumput = &use_facet<__numput_type>(__loc);
 178       else
 179         _M_fnumput = 0;
 180       if (has_facet<__numget_type>(__loc))
 181         _M_fnumget = &use_facet<__numget_type>(__loc);
 182       else
 183         _M_fnumget = 0;
 184     }
 185
 186   // Inhibit implicit instantiations for required instantiations,
 187   // which are defined via explicit instantiations elsewhere.
 188   // NB:  This syntax is a GNU extension.
 189   extern template class basic_ios<char>;
 190   extern template class basic_ios<wchar_t>;
 191 } // namespace std
 192
 193 #endif