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

// basic_ios locale and locale-related member functions -*- C++ -*-

// Copyright (C) 1999, 2001, 2002 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// 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.

#ifndef _CPP_BITS_BASICIOS_TCC
#define _CPP_BITS_BASICIOS_TCC 1

#pragma GCC system_header

namespace std
{
  template<typename _CharT, typename _Traits>
    void
    basic_ios<_CharT, _Traits>::clear(iostate __state)
    { 
      if (this->rdbuf())
	_M_streambuf_state = __state;
      else
	  _M_streambuf_state = __state | badbit;
      if ((this->rdstate() & this->exceptions()))
	__throw_ios_failure("basic_ios::clear(iostate) caused exception");
    }
  
  template<typename _CharT, typename _Traits>
    basic_streambuf<_CharT, _Traits>* 
    basic_ios<_CharT, _Traits>::rdbuf(basic_streambuf<_CharT, _Traits>* __sb)
    {
      basic_streambuf<_CharT, _Traits>* __old = _M_streambuf;
      _M_streambuf = __sb;
      this->clear();
      return __old;
    }

  template<typename _CharT, typename _Traits>
    basic_ios<_CharT, _Traits>&
    basic_ios<_CharT, _Traits>::copyfmt(const basic_ios& __rhs)
    {
      // Per 27.1.1.1, do not call imbue, yet must trash all caches
      // associated with imbue()

      // Alloc any new word array first, so if it fails we have "rollback".
      _Words* __words = (__rhs._M_word_size <= _S_local_word_size) ?
	_M_local_word : new _Words[__rhs._M_word_size];

      // Bump refs before doing callbacks, for safety.
      _Callback_list* __cb = __rhs._M_callbacks;
      if (__cb) 
	__cb->_M_add_reference();
      _M_call_callbacks(erase_event);
      if (_M_word != _M_local_word) 
	{
	  delete [] _M_word;
	  _M_word = 0;
	}
      _M_dispose_callbacks();

      _M_callbacks = __cb;  // NB: Don't want any added during above.
      for (int __i = 0; __i < __rhs._M_word_size; ++__i)
	__words[__i] = __rhs._M_word[__i];
      if (_M_word != _M_local_word) 
	{
	  delete [] _M_word;
	  _M_word = 0;
	}
      _M_word = __words;
      _M_word_size = __rhs._M_word_size;

      this->flags(__rhs.flags());
      this->width(__rhs.width());
      this->precision(__rhs.precision());
      this->tie(__rhs.tie());
      this->fill(__rhs.fill());
      // The next is required to be the last assignment.
      this->exceptions(__rhs.exceptions());
      
      _M_call_callbacks(copyfmt_event);
      return *this;
    }

  template<typename _CharT, typename _Traits>
    char
    basic_ios<_CharT, _Traits>::narrow(char_type __c, char __dfault) const
    { 
      char __ret = __dfault;
      if (_M_check_facet(_M_fctype))
	__ret = _M_fctype->narrow(__c, __dfault); 
      return __ret;
    }

  template<typename _CharT, typename _Traits>
    _CharT
    basic_ios<_CharT, _Traits>::widen(char __c) const
    {
      char_type __ret = char_type();
      if (_M_check_facet(_M_fctype))
	__ret = _M_fctype->widen(__c); 
      return __ret;
    }

  // Locales:
  template<typename _CharT, typename _Traits>
    locale
    basic_ios<_CharT, _Traits>::imbue(const locale& __loc)
    {
      locale __old(this->getloc());
      ios_base::imbue(__loc);
      _M_cache_facets(__loc);
      if (this->rdbuf() != 0)
	this->rdbuf()->pubimbue(__loc);
      return __old;
    }

  template<typename _CharT, typename _Traits>
    void
    basic_ios<_CharT, _Traits>::init(basic_streambuf<_CharT, _Traits>* __sb)
    {
      // NB: This may be called more than once on the same object.
      ios_base::_M_init();
      _M_cache_facets(_M_ios_locale);
      _M_tie = 0;

      // NB: The 27.4.4.1 Postconditions Table specifies requirements
      // after basic_ios::init() has been called. As part of this,
      // fill() must return widen(' ') any time after init() has been
      // called, which needs an imbued ctype facet of char_type to
      // return without throwing an exception. Unfortunately,
      // ctype<char_type> is not necessarily a required facet, so
      // streams with char_type != [char, wchar_t] will not have it by
      // default. Because of this, the correct value for _M_fill is
      // constructed on the first call of fill(). That way,
      // unformatted input and output with non-required basic_ios
      // instantiations is possible even without imbuing the expected
      // ctype<char_type> facet.
      _M_fill = _CharT();
      _M_fill_init = false;

      _M_exception = goodbit;
      _M_streambuf = __sb;
      _M_streambuf_state = __sb ? goodbit : badbit;
    }

  template<typename _CharT, typename _Traits>
    void
    basic_ios<_CharT, _Traits>::_M_cache_facets(const locale& __loc)
    {
      if (has_facet<__ctype_type>(__loc))
	_M_fctype = &use_facet<__ctype_type>(__loc);
      else
	_M_fctype = 0;
      // Should be filled in by ostream and istream, respectively.
      if (has_facet<__numput_type>(__loc))
	_M_fnumput = &use_facet<__numput_type>(__loc); 
      else
	_M_fnumput = 0;
      if (has_facet<__numget_type>(__loc))
	_M_fnumget = &use_facet<__numget_type>(__loc); 
      else
	_M_fnumget = 0;
    }

  // Inhibit implicit instantiations for required instantiations,
  // which are defined via explicit instantiations elsewhere.  
  // NB:  This syntax is a GNU extension.
  extern template class basic_ios<char>;
  extern template class basic_ios<wchar_t>;
} // namespace std

#endif