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

   1 // basic_ios locale and locale-related member functions -*- C++ -*-
   2
   3 // Copyright (C) 1999, 2001 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     basic_streambuf<_CharT, _Traits>*
  37     basic_ios<_CharT, _Traits>::rdbuf(basic_streambuf<_CharT, _Traits>* __sb)
  38     {
  39       basic_streambuf<_CharT, _Traits>* __old = _M_streambuf;
  40       _M_streambuf = __sb;
  41       this->clear();
  42       return __old;
  43     }
  44
  45   template<typename _CharT, typename _Traits>
  46     basic_ios<_CharT, _Traits>&
  47     basic_ios<_CharT, _Traits>::copyfmt(const basic_ios& __rhs)
  48     {
  49       // Per 27.1.1.1, do not call imbue, yet must trash all caches
  50       // associated with imbue()
  51
  52       // Alloc any new word array first, so if it fails we have "rollback".
  53       _Words* __words = (__rhs._M_word_limit <= _S_local_words) ?
  54         _M_word_array : new _Words[__rhs._M_word_limit];
  55
  56       // XXX This is the only reason _Callback_list was defined
  57       // inline. The suspicion is that this increased compilation
  58       // times dramatically for functions that use this member
  59       // function (inserters_extractors, ios_manip_fmtflags). FIX ME,
  60       // clean this stuff up. Callbacks are broken right now, anyway.
  61
  62       // Bump refs before doing callbacks, for safety.
  63       _Callback_list* __cb = __rhs._M_callbacks;
  64       if (__cb)
  65         __cb->_M_add_reference();
  66       _M_call_callbacks(erase_event);
  67       if (_M_words != _M_word_array)
  68         delete [] _M_words;
  69       _M_dispose_callbacks();
  70
  71       _M_callbacks = __cb;  // NB: Don't want any added during above.
  72       for (int __i = 0; __i < __rhs._M_word_limit; ++__i)
  73         __words[__i] = __rhs._M_words[__i];
  74       if (_M_words != _M_word_array)
  75         delete [] _M_words;
  76       _M_words = __words;
  77       _M_word_limit = __rhs._M_word_limit;
  78
  79       this->flags(__rhs.flags());
  80       this->width(__rhs.width());
  81       this->precision(__rhs.precision());
  82       this->tie(__rhs.tie());
  83       this->fill(__rhs.fill());
  84       // The next is required to be the last assignment.
  85       this->exceptions(__rhs.exceptions());
  86
  87       _M_call_callbacks(copyfmt_event);
  88       return *this;
  89     }
  90
  91   template<typename _CharT, typename _Traits>
  92     char
  93     basic_ios<_CharT, _Traits>::narrow(char_type __c, char __dfault) const
  94     { return _M_ios_fctype->narrow(__c, __dfault); }
  95
  96   template<typename _CharT, typename _Traits>
  97     _CharT
  98     basic_ios<_CharT, _Traits>::widen(char __c) const
  99     { return _M_ios_fctype->widen(__c); }
 100
 101   // Locales:
 102   template<typename _CharT, typename _Traits>
 103     locale
 104     basic_ios<_CharT, _Traits>::imbue(const locale& __loc)
 105     {
 106       locale __old(this->getloc());
 107       ios_base::imbue(__loc);
 108       _M_ios_fctype = &use_facet<__ctype_type>(__loc);
 109       _M_fnumput = &use_facet<__numput_type>(__loc);
 110       _M_fnumget = &use_facet<__numget_type>(__loc);
 111       if (this->rdbuf() != 0)
 112         this->rdbuf()->pubimbue(__loc);
 113       return __old;
 114     }
 115
 116   template<typename _CharT, typename _Traits>
 117     void
 118     basic_ios<_CharT, _Traits>::init(basic_streambuf<_CharT, _Traits>* __sb)
 119     {
 120       // NB: This may be called more than once on the same object.
 121       ios_base::_M_init();
 122       _M_ios_fctype = &use_facet<__ctype_type>(_M_ios_locale);
 123       // Should be filled in by ostream and istream, respectively.
 124       _M_fnumput = &use_facet<__numput_type>(_M_ios_locale);
 125       _M_fnumget = &use_facet<__numget_type>(_M_ios_locale);
 126       _M_tie = 0;
 127       _M_fill = this->widen(' ');
 128       _M_exception = goodbit;
 129       _M_streambuf = __sb;
 130       _M_streambuf_state = __sb ? goodbit : badbit;
 131     }
 132
 133 } // namespace std
 134
 135 #endif /* _CPP_BITS_BASICIOS_TCC */
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