The C and C++ Include Header Files

/usr/include/c++/11/bits/basic_ios.tcc


$ cat -n /usr/include/c++/11/bits/basic_ios.tcc

     1	// basic_ios member functions -*- C++ -*-
     2	
     3	// Copyright (C) 1999-2021 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 3, 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	// Under Section 7 of GPL version 3, you are granted additional
    17	// permissions described in the GCC Runtime Library Exception, version
    18	// 3.1, as published by the Free Software Foundation.
    19	
    20	// You should have received a copy of the GNU General Public License and
    21	// a copy of the GCC Runtime Library Exception along with this program;
    22	// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
    23	// <http://www.gnu.org/licenses/>.
    24	
    25	/** @file bits/basic_ios.tcc
    26	 *  This is an internal header file, included by other library headers.
    27	 *  Do not attempt to use it directly. @headername{ios}
    28	 */
    29	
    30	#ifndef _BASIC_IOS_TCC
    31	#define _BASIC_IOS_TCC 1
    32	
    33	#pragma GCC system_header
    34	
    35	namespace std _GLIBCXX_VISIBILITY(default)
    36	{
    37	_GLIBCXX_BEGIN_NAMESPACE_VERSION
    38	
    39	  template<typename _CharT, typename _Traits>
    40	    void
    41	    basic_ios<_CharT, _Traits>::clear(iostate __state)
    42	    {
    43	      if (this->rdbuf())
    44		_M_streambuf_state = __state;
    45	      else
    46		  _M_streambuf_state = __state | badbit;
    47	      if (this->exceptions() & this->rdstate())
    48		__throw_ios_failure(__N("basic_ios::clear"));
    49	    }
    50	
    51	  template<typename _CharT, typename _Traits>
    52	    basic_streambuf<_CharT, _Traits>*
    53	    basic_ios<_CharT, _Traits>::rdbuf(basic_streambuf<_CharT, _Traits>* __sb)
    54	    {
    55	      basic_streambuf<_CharT, _Traits>* __old = _M_streambuf;
    56	      _M_streambuf = __sb;
    57	      this->clear();
    58	      return __old;
    59	    }
    60	
    61	  template<typename _CharT, typename _Traits>
    62	    basic_ios<_CharT, _Traits>&
    63	    basic_ios<_CharT, _Traits>::copyfmt(const basic_ios& __rhs)
    64	    {
    65	      // _GLIBCXX_RESOLVE_LIB_DEFECTS
    66	      // 292. effects of a.copyfmt (a)
    67	      if (this != &__rhs)
    68		{
    69		  // Per 27.1.1, do not call imbue, yet must trash all caches
    70		  // associated with imbue()
    71	
    72		  // Alloc any new word array first, so if it fails we have "rollback".
    73		  _Words* __words = (__rhs._M_word_size <= _S_local_word_size) ?
    74		                     _M_local_word : new _Words[__rhs._M_word_size];
    75	
    76		  // Bump refs before doing callbacks, for safety.
    77		  _Callback_list* __cb = __rhs._M_callbacks;
    78		  if (__cb)
    79		    __cb->_M_add_reference();
    80		  _M_call_callbacks(erase_event);
    81		  if (_M_word != _M_local_word)
    82		    {
    83		      delete [] _M_word;
    84		      _M_word = 0;
    85		    }
    86		  _M_dispose_callbacks();
    87	
    88		  // NB: Don't want any added during above.
    89		  _M_callbacks = __cb;
    90		  for (int __i = 0; __i < __rhs._M_word_size; ++__i)
    91		    __words[__i] = __rhs._M_word[__i];
    92		  _M_word = __words;
    93		  _M_word_size = __rhs._M_word_size;
    94	
    95		  this->flags(__rhs.flags());
    96		  this->width(__rhs.width());
    97		  this->precision(__rhs.precision());
    98		  this->tie(__rhs.tie());
    99		  this->fill(__rhs.fill());
   100		  _M_ios_locale = __rhs.getloc();
   101		  _M_cache_locale(_M_ios_locale);
   102	
   103		  _M_call_callbacks(copyfmt_event);
   104	
   105		  // The next is required to be the last assignment.
   106		  this->exceptions(__rhs.exceptions());
   107		}
   108	      return *this;
   109	    }
   110	
   111	  // Locales:
   112	  template<typename _CharT, typename _Traits>
   113	    locale
   114	    basic_ios<_CharT, _Traits>::imbue(const locale& __loc)
   115	    {
   116	      locale __old(this->getloc());
   117	      ios_base::imbue(__loc);
   118	      _M_cache_locale(__loc);
   119	      if (this->rdbuf() != 0)
   120		this->rdbuf()->pubimbue(__loc);
   121	      return __old;
   122	    }
   123	
   124	  template<typename _CharT, typename _Traits>
   125	    void
   126	    basic_ios<_CharT, _Traits>::init(basic_streambuf<_CharT, _Traits>* __sb)
   127	    {
   128	      // NB: This may be called more than once on the same object.
   129	      ios_base::_M_init();
   130	
   131	      // Cache locale data and specific facets used by iostreams.
   132	      _M_cache_locale(_M_ios_locale);
   133	
   134	      // NB: The 27.4.4.1 Postconditions Table specifies requirements
   135	      // after basic_ios::init() has been called. As part of this,
   136	      // fill() must return widen(' ') any time after init() has been
   137	      // called, which needs an imbued ctype facet of char_type to
   138	      // return without throwing an exception. Unfortunately,
   139	      // ctype<char_type> is not necessarily a required facet, so
   140	      // streams with char_type != [char, wchar_t] will not have it by
   141	      // default. Because of this, the correct value for _M_fill is
   142	      // constructed on the first call of fill(). That way,
   143	      // unformatted input and output with non-required basic_ios
   144	      // instantiations is possible even without imbuing the expected
   145	      // ctype<char_type> facet.
   146	      _M_fill = _CharT();
   147	      _M_fill_init = false;
   148	
   149	      _M_tie = 0;
   150	      _M_exception = goodbit;
   151	      _M_streambuf = __sb;
   152	      _M_streambuf_state = __sb ? goodbit : badbit;
   153	    }
   154	
   155	  template<typename _CharT, typename _Traits>
   156	    void
   157	    basic_ios<_CharT, _Traits>::_M_cache_locale(const locale& __loc)
   158	    {
   159	      if (__builtin_expect(has_facet<__ctype_type>(__loc), true))
   160		_M_ctype = std::__addressof(use_facet<__ctype_type>(__loc));
   161	      else
   162		_M_ctype = 0;
   163	
   164	      if (__builtin_expect(has_facet<__num_put_type>(__loc), true))
   165		_M_num_put = std::__addressof(use_facet<__num_put_type>(__loc));
   166	      else
   167		_M_num_put = 0;
   168	
   169	      if (__builtin_expect(has_facet<__num_get_type>(__loc), true))
   170		_M_num_get = std::__addressof(use_facet<__num_get_type>(__loc));
   171	      else
   172		_M_num_get = 0;
   173	    }
   174	
   175	  // Inhibit implicit instantiations for required instantiations,
   176	  // which are defined via explicit instantiations elsewhere.
   177	#if _GLIBCXX_EXTERN_TEMPLATE
   178	  extern template class basic_ios<char>;
   179	
   180	#ifdef _GLIBCXX_USE_WCHAR_T
   181	  extern template class basic_ios<wchar_t>;
   182	#endif
   183	#endif
   184	
   185	_GLIBCXX_END_NAMESPACE_VERSION
   186	} // namespace std
   187	
   188	#endif