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 namespace std
  34 {
  35   template<typename _CharT, typename _Traits>
  36     void
  37     basic_ios<_CharT, _Traits>::clear(iostate __state)
  38     {
  39       if (this->rdbuf())
  40         _M_streambuf_state = __state;
  41       else
  42           _M_streambuf_state = __state | badbit;
  43       if ((this->rdstate() & this->exceptions()))
  44         __throw_ios_failure("basic_ios::clear(iostate) caused exception");
  45     }
  46
  47   template<typename _CharT, typename _Traits>
  48     basic_streambuf<_CharT, _Traits>*
  49     basic_ios<_CharT, _Traits>::rdbuf(basic_streambuf<_CharT, _Traits>* __sb)
  50     {
  51       basic_streambuf<_CharT, _Traits>* __old = _M_streambuf;
  52       _M_streambuf = __sb;
  53       this->clear();
  54       return __old;
  55     }
  56
  57   template<typename _CharT, typename _Traits>
  58     basic_ios<_CharT, _Traits>&
  59     basic_ios<_CharT, _Traits>::copyfmt(const basic_ios& __rhs)
  60     {
  61       // Per 27.1.1.1, do not call imbue, yet must trash all caches
  62       // associated with imbue()
  63
  64       // Alloc any new word array first, so if it fails we have "rollback".
  65       _Words* __words = (__rhs._M_word_limit <= _S_local_words) ?
  66         _M_word_array : new _Words[__rhs._M_word_limit];
  67
  68       // XXX This is the only reason _Callback_list was defined
  69       // inline. The suspicion is that this increased compilation
  70       // times dramatically for functions that use this member
  71       // function (inserters_extractors, ios_manip_fmtflags). FIX ME,
  72       // clean this stuff up. Callbacks are broken right now, anyway.
  73
  74       // Bump refs before doing callbacks, for safety.
  75       _Callback_list* __cb = __rhs._M_callbacks;
  76       if (__cb)
  77         __cb->_M_add_reference();
  78       _M_call_callbacks(erase_event);
  79       if (_M_words != _M_word_array)
  80         delete [] _M_words;
  81       _M_dispose_callbacks();
  82
  83       _M_callbacks = __cb;  // NB: Don't want any added during above.
  84       for (int __i = 0; __i < __rhs._M_word_limit; ++__i)
  85         __words[__i] = __rhs._M_words[__i];
  86       if (_M_words != _M_word_array)
  87         delete [] _M_words;
  88       _M_words = __words;
  89       _M_word_limit = __rhs._M_word_limit;
  90
  91       this->flags(__rhs.flags());
  92       this->width(__rhs.width());
  93       this->precision(__rhs.precision());
  94       this->tie(__rhs.tie());
  95       this->fill(__rhs.fill());
  96       // The next is required to be the last assignment.
  97       this->exceptions(__rhs.exceptions());
  98
  99       _M_call_callbacks(copyfmt_event);
 100       return *this;
 101     }
 102
 103   template<typename _CharT, typename _Traits>
 104     char
 105     basic_ios<_CharT, _Traits>::narrow(char_type __c, char __dfault) const
 106     {
 107       char __ret = __dfault;
 108       if (_M_check_facet(_M_ios_fctype))
 109         __ret = _M_ios_fctype->narrow(__c, __dfault);
 110       return __ret;
 111     }
 112
 113   template<typename _CharT, typename _Traits>
 114     _CharT
 115     basic_ios<_CharT, _Traits>::widen(char __c) const
 116     {
 117       char_type __ret = char_type();
 118       if (_M_check_facet(_M_ios_fctype))
 119         __ret = _M_ios_fctype->widen(__c);
 120       return __ret;
 121     }
 122
 123   // Locales:
 124   template<typename _CharT, typename _Traits>
 125     locale
 126     basic_ios<_CharT, _Traits>::imbue(const locale& __loc)
 127     {
 128       locale __old(this->getloc());
 129       ios_base::imbue(__loc);
 130       _M_cache_facets(__loc);
 131       if (this->rdbuf() != 0)
 132         this->rdbuf()->pubimbue(__loc);
 133       return __old;
 134     }
 135
 136   template<typename _CharT, typename _Traits>
 137     void
 138     basic_ios<_CharT, _Traits>::init(basic_streambuf<_CharT, _Traits>* __sb)
 139     {
 140       // NB: This may be called more than once on the same object.
 141       ios_base::_M_init();
 142       _M_cache_facets(_M_ios_locale);
 143       _M_tie = 0;
 144
 145       // NB: The 27.4.4.1 Postconditions Table only specifies
 146       // requirements after basic_ios::init() has been called. As part
 147       // of this, fill() must return widen(' '), which needs an imbued
 148       // ctype facet of char_type to return without throwing an
 149       // exception. This is not a required facet, so streams with
 150       // char_type != [char, wchar_t] will not have it by
 151       // default. However, because fill()'s signature is const, this
 152       // data member cannot be lazily initialized.  Thus, thoughts of
 153       // using a non-const helper function in ostream inserters is
 154       // really besides the point.
 155       _M_fill = this->widen(' ');
 156
 157       _M_exception = goodbit;
 158       _M_streambuf = __sb;
 159       _M_streambuf_state = __sb ? goodbit : badbit;
 160     }
 161
 162   template<typename _CharT, typename _Traits>
 163     void
 164     basic_ios<_CharT, _Traits>::_M_cache_facets(const locale& __loc)
 165     {
 166       if (has_facet<__ctype_type>(__loc))
 167         _M_ios_fctype = &use_facet<__ctype_type>(__loc);
 168       else
 169         _M_ios_fctype = 0;
 170       // Should be filled in by ostream and istream, respectively.
 171       if (has_facet<__numput_type>(__loc))
 172         _M_fnumput = &use_facet<__numput_type>(__loc);
 173       else
 174         _M_fnumput = 0;
 175       if (has_facet<__numget_type>(__loc))
 176         _M_fnumget = &use_facet<__numget_type>(__loc);
 177       else
 178         _M_fnumget = 0;
 179     }
 180
 181   // Inhibit implicit instantiations for required instantiations,
 182   // which are defined via explicit instantiations elsewhere.
 183   // NB:  This syntax is a GNU extension.
 184   extern template class basic_ios<char>;
 185   extern template class basic_ios<wchar_t>;
 186 } // namespace std
 187
 188 #endif