Preview: basic_ios.tcc
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/opt/rh/gcc-toolset-14/root/usr/include/c++/14/bits/basic_ios.tcc
// basic_ios member functions -*- C++ -*-
// Copyright (C) 1999-2024 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 3, 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.
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
// <http://www.gnu.org/licenses/>.
/** @file bits/basic_ios.tcc
* This is an internal header file, included by other library headers.
* Do not attempt to use it directly. @headername{ios}
*/
#ifndef _BASIC_IOS_TCC
#define _BASIC_IOS_TCC 1
#pragma GCC system_header
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
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->exceptions() & this->rdstate())
__throw_ios_failure(__N("basic_ios::clear"));
}
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)
{
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 292. effects of a.copyfmt (a)
if (this != std::__addressof(__rhs))
{
// Per 27.1.1, 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();
// NB: Don't want any added during above.
_M_callbacks = __cb;
for (int __i = 0; __i < __rhs._M_word_size; ++__i)
__words[__i] = __rhs._M_word[__i];
_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());
_M_ios_locale = __rhs.getloc();
_M_cache_locale(_M_ios_locale);
_M_call_callbacks(copyfmt_event);
// The next is required to be the last assignment.
this->exceptions(__rhs.exceptions());
}
return *this;
}
// 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_locale(__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();
// Cache locale data and specific facets used by iostreams.
_M_cache_locale(_M_ios_locale);
// 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_tie = 0;
_M_exception = goodbit;
_M_streambuf = __sb;
_M_streambuf_state = __sb ? goodbit : badbit;
}
template<typename _CharT, typename _Traits>
void
basic_ios<_CharT, _Traits>::_M_cache_locale(const locale& __loc)
{
_M_ctype = std::__try_use_facet<__ctype_type>(__loc);
_M_num_put = std::__try_use_facet<__num_put_type>(__loc);
_M_num_get = std::__try_use_facet<__num_get_type>(__loc);
}
// Inhibit implicit instantiations for required instantiations,
// which are defined via explicit instantiations elsewhere.
#if _GLIBCXX_EXTERN_TEMPLATE
extern template class basic_ios<char>;
#ifdef _GLIBCXX_USE_WCHAR_T
extern template class basic_ios<wchar_t>;
#endif
#endif
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std
#endif
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