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Edit File : basic_ios.h \| Size : 15.70 KB
// Iostreams base classes -- C++ -- // Copyright (C) 1997-2018 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.h * This is an internal header file, included by other library headers. * Do not attempt to use it directly. @headername{ios} / #ifndef _BASIC_IOS_H #define _BASIC_IOS_H 1 #pragma GCC system_header #include <bits/localefwd.h> #include <bits/locale_classes.h> #include <bits/locale_facets.h> #include <bits/streambuf_iterator.h> #include <bits/move.h> namespace std _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION template<typename _Facet> inline const _Facet& __check_facet(const _Facet __f) { if (!__f) __throw_bad_cast(); return __f; } /* * @brief Template class basic_ios, virtual base class for all * stream classes. * @ingroup io * * @tparam _CharT Type of character stream. * @tparam _Traits Traits for character type, defaults to * char_traits<_CharT>. * * Most of the member functions called dispatched on stream objects * (e.g., @c std::cout.foo(bar);) are consolidated in this class. / template<typename _CharT, typename _Traits> class basic_ios : public ios_base { public: //@{ /* * These are standard types. They permit a standardized way of * referring to names of (or names dependent on) the template * parameters, which are specific to the implementation. / typedef _CharT char_type; typedef typename _Traits::int_type int_type; typedef typename _Traits::pos_type pos_type; typedef typename _Traits::off_type off_type; typedef _Traits traits_type; //@} //@{ /* * These are non-standard types. / typedef ctype<_CharT> __ctype_type; typedef num_put<_CharT, ostreambuf_iterator<_CharT, _Traits> > __num_put_type; typedef num_get<_CharT, istreambuf_iterator<_CharT, _Traits> > __num_get_type; //@} // Data members: protected: basic_ostream<_CharT, _Traits> _M_tie; mutable char_type _M_fill; mutable bool _M_fill_init; basic_streambuf<_CharT, _Traits>* _M_streambuf; // Cached use_facet<ctype>, which is based on the current locale info. const __ctype_type* _M_ctype; // For ostream. const __num_put_type* _M_num_put; // For istream. const __num_get_type* _M_num_get; public: //@{ /** * @brief The quick-and-easy status check. * * This allows you to write constructs such as * <code>if (!a_stream) ...</code> and <code>while (a_stream) ...</code> / #if __cplusplus >= 201103L explicit operator bool() const { return !this->fail(); } #else operator void() const { return this->fail() ? 0 : const_cast<basic_ios>(this); } #endif bool operator!() const { return this->fail(); } //@} /* * @brief Returns the error state of the stream buffer. * @return A bit pattern (well, isn't everything?) * * See std::ios_base::iostate for the possible bit values. Most * users will call one of the interpreting wrappers, e.g., good(). / iostate rdstate() const { return _M_streambuf_state; } /* * @brief [Re]sets the error state. * @param __state The new state flag(s) to set. * * See std::ios_base::iostate for the possible bit values. Most * users will not need to pass an argument. / void clear(iostate __state = goodbit); /* * @brief Sets additional flags in the error state. * @param __state The additional state flag(s) to set. * * See std::ios_base::iostate for the possible bit values. / void setstate(iostate __state) { this->clear(this->rdstate() \| __state); } // Flip the internal state on for the proper state bits, then // rethrows the propagated exception if bit also set in // exceptions(). void _M_setstate(iostate __state) { // 27.6.1.2.1 Common requirements. // Turn this on without causing an ios::failure to be thrown. _M_streambuf_state \|= __state; if (this->exceptions() & __state) __throw_exception_again; } /* * @brief Fast error checking. * @return True if no error flags are set. * * A wrapper around rdstate. / bool good() const { return this->rdstate() == 0; } /* * @brief Fast error checking. * @return True if the eofbit is set. * * Note that other iostate flags may also be set. / bool eof() const { return (this->rdstate() & eofbit) != 0; } /* * @brief Fast error checking. * @return True if either the badbit or the failbit is set. * * Checking the badbit in fail() is historical practice. * Note that other iostate flags may also be set. / bool fail() const { return (this->rdstate() & (badbit \| failbit)) != 0; } /* * @brief Fast error checking. * @return True if the badbit is set. * * Note that other iostate flags may also be set. / bool bad() const { return (this->rdstate() & badbit) != 0; } /* * @brief Throwing exceptions on errors. * @return The current exceptions mask. * * This changes nothing in the stream. See the one-argument version * of exceptions(iostate) for the meaning of the return value. / iostate exceptions() const { return _M_exception; } /* * @brief Throwing exceptions on errors. * @param __except The new exceptions mask. * * By default, error flags are set silently. You can set an * exceptions mask for each stream; if a bit in the mask becomes set * in the error flags, then an exception of type * std::ios_base::failure is thrown. * * If the error flag is already set when the exceptions mask is * added, the exception is immediately thrown. Try running the * following under GCC 3.1 or later: * @code * #include <iostream> * #include <fstream> * #include <exception> * * int main() * { * std::set_terminate (__gnu_cxx::__verbose_terminate_handler); * * std::ifstream f ("/etc/motd"); * * std::cerr << "Setting badbit\n"; * f.setstate (std::ios_base::badbit); * * std::cerr << "Setting exception mask\n"; * f.exceptions (std::ios_base::badbit); * } * @endcode / void exceptions(iostate __except) { _M_exception = __except; this->clear(_M_streambuf_state); } // Constructor/destructor: /* * @brief Constructor performs initialization. * * The parameter is passed by derived streams. / explicit basic_ios(basic_streambuf<_CharT, _Traits> __sb) : ios_base(), _M_tie(0), _M_fill(), _M_fill_init(false), _M_streambuf(0), _M_ctype(0), _M_num_put(0), _M_num_get(0) { this->init(__sb); } /** * @brief Empty. * * The destructor does nothing. More specifically, it does not * destroy the streambuf held by rdbuf(). / virtual ~basic_ios() { } // Members: /* * @brief Fetches the current @e tied stream. * @return A pointer to the tied stream, or NULL if the stream is * not tied. * * A stream may be @e tied (or synchronized) to a second output * stream. When this stream performs any I/O, the tied stream is * first flushed. For example, @c std::cin is tied to @c std::cout. / basic_ostream<_CharT, _Traits> tie() const { return _M_tie; } /** * @brief Ties this stream to an output stream. * @param __tiestr The output stream. * @return The previously tied output stream, or NULL if the stream * was not tied. * * This sets up a new tie; see tie() for more. / basic_ostream<_CharT, _Traits> tie(basic_ostream<_CharT, _Traits>* __tiestr) { basic_ostream<_CharT, _Traits>* __old = _M_tie; _M_tie = __tiestr; return __old; } /** * @brief Accessing the underlying buffer. * @return The current stream buffer. * * This does not change the state of the stream. / basic_streambuf<_CharT, _Traits> rdbuf() const { return _M_streambuf; } /** * @brief Changing the underlying buffer. * @param __sb The new stream buffer. * @return The previous stream buffer. * * Associates a new buffer with the current stream, and clears the * error state. * * Due to historical accidents which the LWG refuses to correct, the * I/O library suffers from a design error: this function is hidden * in derived classes by overrides of the zero-argument @c rdbuf(), * which is non-virtual for hysterical raisins. As a result, you * must use explicit qualifications to access this function via any * derived class. For example: * * @code * std::fstream foo; // or some other derived type * std::streambuf* p = .....; * * foo.ios::rdbuf(p); // ios == basic_ios<char> * @endcode / basic_streambuf<_CharT, _Traits> rdbuf(basic_streambuf<_CharT, _Traits>* __sb); /** * @brief Copies fields of __rhs into this. * @param __rhs The source values for the copies. * @return Reference to this object. * * All fields of __rhs are copied into this object except that rdbuf() * and rdstate() remain unchanged. All values in the pword and iword * arrays are copied. Before copying, each callback is invoked with * erase_event. After copying, each (new) callback is invoked with * copyfmt_event. The final step is to copy exceptions(). / basic_ios& copyfmt(const basic_ios& __rhs); /* * @brief Retrieves the @a empty character. * @return The current fill character. * * It defaults to a space (' ') in the current locale. / char_type fill() const { if (!_M_fill_init) { _M_fill = this->widen(' '); _M_fill_init = true; } return _M_fill; } /* * @brief Sets a new @a empty character. * @param __ch The new character. * @return The previous fill character. * * The fill character is used to fill out space when P+ characters * have been requested (e.g., via setw), Q characters are actually * used, and Q<P. It defaults to a space (' ') in the current locale. / char_type fill(char_type __ch) { char_type __old = this->fill(); _M_fill = __ch; return __old; } // Locales: /* * @brief Moves to a new locale. * @param __loc The new locale. * @return The previous locale. * * Calls @c ios_base::imbue(loc), and if a stream buffer is associated * with this stream, calls that buffer's @c pubimbue(loc). * * Additional l10n notes are at * http://gcc.gnu.org/onlinedocs/libstdc++/manual/localization.html / locale imbue(const locale& __loc); /* * @brief Squeezes characters. * @param __c The character to narrow. * @param __dfault The character to narrow. * @return The narrowed character. * * Maps a character of @c char_type to a character of @c char, * if possible. * * Returns the result of * @code * std::use_facet<ctype<char_type> >(getloc()).narrow(c,dfault) * @endcode * * Additional l10n notes are at * http://gcc.gnu.org/onlinedocs/libstdc++/manual/localization.html / char narrow(char_type __c, char __dfault) const { return __check_facet(_M_ctype).narrow(__c, __dfault); } /* * @brief Widens characters. * @param __c The character to widen. * @return The widened character. * * Maps a character of @c char to a character of @c char_type. * * Returns the result of * @code * std::use_facet<ctype<char_type> >(getloc()).widen(c) * @endcode * * Additional l10n notes are at * http://gcc.gnu.org/onlinedocs/libstdc++/manual/localization.html / char_type widen(char __c) const { return __check_facet(_M_ctype).widen(__c); } protected: // 27.4.5.1 basic_ios constructors /* * @brief Empty. * * The default constructor does nothing and is not normally * accessible to users. / basic_ios() : ios_base(), _M_tie(0), _M_fill(char_type()), _M_fill_init(false), _M_streambuf(0), _M_ctype(0), _M_num_put(0), _M_num_get(0) { } /* * @brief All setup is performed here. * * This is called from the public constructor. It is not virtual and * cannot be redefined. / void init(basic_streambuf<_CharT, _Traits> __sb); #if __cplusplus >= 201103L basic_ios(const basic_ios&) = delete; basic_ios& operator=(const basic_ios&) = delete; void move(basic_ios& __rhs) { ios_base::_M_move(__rhs); _M_cache_locale(_M_ios_locale); this->tie(__rhs.tie(nullptr)); _M_fill = __rhs._M_fill; _M_fill_init = __rhs._M_fill_init; _M_streambuf = nullptr; } void move(basic_ios&& __rhs) { this->move(__rhs); } void swap(basic_ios& __rhs) noexcept { ios_base::_M_swap(__rhs); _M_cache_locale(_M_ios_locale); __rhs._M_cache_locale(__rhs._M_ios_locale); std::swap(_M_tie, __rhs._M_tie); std::swap(_M_fill, __rhs._M_fill); std::swap(_M_fill_init, __rhs._M_fill_init); } void set_rdbuf(basic_streambuf<_CharT, _Traits>* __sb) { _M_streambuf = __sb; } #endif void _M_cache_locale(const locale& __loc); }; _GLIBCXX_END_NAMESPACE_VERSION } // namespace #include <bits/basic_ios.tcc> #endif /* _BASIC_IOS_H */ Back

Edit File : basic_ios.h | Size : 15.70 KB

// Iostreams base classes -*- C++ -*-

// Copyright (C) 1997-2018 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.h
 *  This is an internal header file, included by other library headers.
 *  Do not attempt to use it directly. @headername{ios}
 */

#ifndef _BASIC_IOS_H
#define _BASIC_IOS_H 1

#pragma GCC system_header

#include <bits/localefwd.h>
#include <bits/locale_classes.h>
#include <bits/locale_facets.h>
#include <bits/streambuf_iterator.h>
#include <bits/move.h>

namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

template<typename _Facet>
    inline const _Facet&
    __check_facet(const _Facet* __f)
    {
      if (!__f)
	__throw_bad_cast();
      return *__f;
    }

/**
   *  @brief Template class basic_ios, virtual base class for all
   *  stream classes. 
   *  @ingroup io
   *
   *  @tparam _CharT  Type of character stream.
   *  @tparam _Traits  Traits for character type, defaults to
   *                   char_traits<_CharT>.
   *
   *  Most of the member functions called dispatched on stream objects
   *  (e.g., @c std::cout.foo(bar);) are consolidated in this class.
  */
  template<typename _CharT, typename _Traits>
    class basic_ios : public ios_base
    {
    public:
      //@{
      /**
       *  These are standard types.  They permit a standardized way of
       *  referring to names of (or names dependent on) the template
       *  parameters, which are specific to the implementation.
      */
      typedef _CharT                                 char_type;
      typedef typename _Traits::int_type             int_type;
      typedef typename _Traits::pos_type             pos_type;
      typedef typename _Traits::off_type             off_type;
      typedef _Traits                                traits_type;
      //@}

//@{
      /**
       *  These are non-standard types.
      */
      typedef ctype<_CharT>                          __ctype_type;
      typedef num_put<_CharT, ostreambuf_iterator<_CharT, _Traits> >
						     __num_put_type;
      typedef num_get<_CharT, istreambuf_iterator<_CharT, _Traits> >
						     __num_get_type;
      //@}

// Data members:
    protected:
      basic_ostream<_CharT, _Traits>*                _M_tie;
      mutable char_type                              _M_fill;
      mutable bool                                   _M_fill_init;
      basic_streambuf<_CharT, _Traits>*              _M_streambuf;

// Cached use_facet<ctype>, which is based on the current locale info.
      const __ctype_type*                            _M_ctype;
      // For ostream.
      const __num_put_type*                          _M_num_put;
      // For istream.
      const __num_get_type*                          _M_num_get;

public:
      //@{
      /**
       *  @brief  The quick-and-easy status check.
       *
       *  This allows you to write constructs such as
       *  <code>if (!a_stream) ...</code> and <code>while (a_stream) ...</code>
      */
#if __cplusplus >= 201103L
      explicit operator bool() const
      { return !this->fail(); }
#else
      operator void*() const
      { return this->fail() ? 0 : const_cast<basic_ios*>(this); }
#endif

bool
      operator!() const
      { return this->fail(); }
      //@}

/**
       *  @brief  Returns the error state of the stream buffer.
       *  @return  A bit pattern (well, isn't everything?)
       *
       *  See std::ios_base::iostate for the possible bit values.  Most
       *  users will call one of the interpreting wrappers, e.g., good().
      */
      iostate
      rdstate() const
      { return _M_streambuf_state; }

/**
       *  @brief  [Re]sets the error state.
       *  @param  __state  The new state flag(s) to set.
       *
       *  See std::ios_base::iostate for the possible bit values.  Most
       *  users will not need to pass an argument.
      */
      void
      clear(iostate __state = goodbit);

/**
       *  @brief  Sets additional flags in the error state.
       *  @param  __state  The additional state flag(s) to set.
       *
       *  See std::ios_base::iostate for the possible bit values.
      */
      void
      setstate(iostate __state)
      { this->clear(this->rdstate() | __state); }

// Flip the internal state on for the proper state bits, then
      // rethrows the propagated exception if bit also set in
      // exceptions().
      void
      _M_setstate(iostate __state)
      {
	// 27.6.1.2.1 Common requirements.
	// Turn this on without causing an ios::failure to be thrown.
	_M_streambuf_state |= __state;
	if (this->exceptions() & __state)
	  __throw_exception_again;
      }

/**
       *  @brief  Fast error checking.
       *  @return  True if no error flags are set.
       *
       *  A wrapper around rdstate.
      */
      bool
      good() const
      { return this->rdstate() == 0; }

/**
       *  @brief  Fast error checking.
       *  @return  True if the eofbit is set.
       *
       *  Note that other iostate flags may also be set.
      */
      bool
      eof() const
      { return (this->rdstate() & eofbit) != 0; }

/**
       *  @brief  Fast error checking.
       *  @return  True if either the badbit or the failbit is set.
       *
       *  Checking the badbit in fail() is historical practice.
       *  Note that other iostate flags may also be set.
      */
      bool
      fail() const
      { return (this->rdstate() & (badbit | failbit)) != 0; }

/**
       *  @brief  Fast error checking.
       *  @return  True if the badbit is set.
       *
       *  Note that other iostate flags may also be set.
      */
      bool
      bad() const
      { return (this->rdstate() & badbit) != 0; }

/**
       *  @brief  Throwing exceptions on errors.
       *  @return  The current exceptions mask.
       *
       *  This changes nothing in the stream.  See the one-argument version
       *  of exceptions(iostate) for the meaning of the return value.
      */
      iostate
      exceptions() const
      { return _M_exception; }

/**
       *  @brief  Throwing exceptions on errors.
       *  @param  __except  The new exceptions mask.
       *
       *  By default, error flags are set silently.  You can set an
       *  exceptions mask for each stream; if a bit in the mask becomes set
       *  in the error flags, then an exception of type
       *  std::ios_base::failure is thrown.
       *
       *  If the error flag is already set when the exceptions mask is
       *  added, the exception is immediately thrown.  Try running the
       *  following under GCC 3.1 or later:
       *  @code
       *  #include <iostream>
       *  #include <fstream>
       *  #include <exception>
       *
       *  int main()
       *  {
       *      std::set_terminate (__gnu_cxx::__verbose_terminate_handler);
       *
       *      std::ifstream f ("/etc/motd");
       *
       *      std::cerr << "Setting badbit\n";
       *      f.setstate (std::ios_base::badbit);
       *
       *      std::cerr << "Setting exception mask\n";
       *      f.exceptions (std::ios_base::badbit);
       *  }
       *  @endcode
      */
      void
      exceptions(iostate __except)
      {
        _M_exception = __except;
        this->clear(_M_streambuf_state);
      }

// Constructor/destructor:
      /**
       *  @brief  Constructor performs initialization.
       *
       *  The parameter is passed by derived streams.
      */
      explicit
      basic_ios(basic_streambuf<_CharT, _Traits>* __sb)
      : ios_base(), _M_tie(0), _M_fill(), _M_fill_init(false), _M_streambuf(0),
	_M_ctype(0), _M_num_put(0), _M_num_get(0)
      { this->init(__sb); }

/**
       *  @brief  Empty.
       *
       *  The destructor does nothing.  More specifically, it does not
       *  destroy the streambuf held by rdbuf().
      */
      virtual
      ~basic_ios() { }

// Members:
      /**
       *  @brief  Fetches the current @e tied stream.
       *  @return  A pointer to the tied stream, or NULL if the stream is
       *           not tied.
       *
       *  A stream may be @e tied (or synchronized) to a second output
       *  stream.  When this stream performs any I/O, the tied stream is
       *  first flushed.  For example, @c std::cin is tied to @c std::cout.
      */
      basic_ostream<_CharT, _Traits>*
      tie() const
      { return _M_tie; }

/**
       *  @brief  Ties this stream to an output stream.
       *  @param  __tiestr  The output stream.
       *  @return  The previously tied output stream, or NULL if the stream
       *           was not tied.
       *
       *  This sets up a new tie; see tie() for more.
      */
      basic_ostream<_CharT, _Traits>*
      tie(basic_ostream<_CharT, _Traits>* __tiestr)
      {
        basic_ostream<_CharT, _Traits>* __old = _M_tie;
        _M_tie = __tiestr;
        return __old;
      }

/**
       *  @brief  Accessing the underlying buffer.
       *  @return  The current stream buffer.
       *
       *  This does not change the state of the stream.
      */
      basic_streambuf<_CharT, _Traits>*
      rdbuf() const
      { return _M_streambuf; }

/**
       *  @brief  Changing the underlying buffer.
       *  @param  __sb  The new stream buffer.
       *  @return  The previous stream buffer.
       *
       *  Associates a new buffer with the current stream, and clears the
       *  error state.
       *
       *  Due to historical accidents which the LWG refuses to correct, the
       *  I/O library suffers from a design error:  this function is hidden
       *  in derived classes by overrides of the zero-argument @c rdbuf(),
       *  which is non-virtual for hysterical raisins.  As a result, you
       *  must use explicit qualifications to access this function via any
       *  derived class.  For example:
       *
       *  @code
       *  std::fstream     foo;         // or some other derived type
       *  std::streambuf*  p = .....;
       *
       *  foo.ios::rdbuf(p);            // ios == basic_ios<char>
       *  @endcode
      */
      basic_streambuf<_CharT, _Traits>*
      rdbuf(basic_streambuf<_CharT, _Traits>* __sb);

/**
       *  @brief  Copies fields of __rhs into this.
       *  @param  __rhs  The source values for the copies.
       *  @return  Reference to this object.
       *
       *  All fields of __rhs are copied into this object except that rdbuf()
       *  and rdstate() remain unchanged.  All values in the pword and iword
       *  arrays are copied.  Before copying, each callback is invoked with
       *  erase_event.  After copying, each (new) callback is invoked with
       *  copyfmt_event.  The final step is to copy exceptions().
      */
      basic_ios&
      copyfmt(const basic_ios& __rhs);

/**
       *  @brief  Retrieves the @a empty character.
       *  @return  The current fill character.
       *
       *  It defaults to a space (' ') in the current locale.
      */
      char_type
      fill() const
      {
	if (!_M_fill_init)
	  {
	    _M_fill = this->widen(' ');
	    _M_fill_init = true;
	  }
	return _M_fill;
      }

/**
       *  @brief  Sets a new @a empty character.
       *  @param  __ch  The new character.
       *  @return  The previous fill character.
       *
       *  The fill character is used to fill out space when P+ characters
       *  have been requested (e.g., via setw), Q characters are actually
       *  used, and Q<P.  It defaults to a space (' ') in the current locale.
      */
      char_type
      fill(char_type __ch)
      {
	char_type __old = this->fill();
	_M_fill = __ch;
	return __old;
      }

// Locales:
      /**
       *  @brief  Moves to a new locale.
       *  @param  __loc  The new locale.
       *  @return  The previous locale.
       *
       *  Calls @c ios_base::imbue(loc), and if a stream buffer is associated
       *  with this stream, calls that buffer's @c pubimbue(loc).
       *
       *  Additional l10n notes are at
       *  http://gcc.gnu.org/onlinedocs/libstdc++/manual/localization.html
      */
      locale
      imbue(const locale& __loc);

/**
       *  @brief  Squeezes characters.
       *  @param  __c  The character to narrow.
       *  @param  __dfault  The character to narrow.
       *  @return  The narrowed character.
       *
       *  Maps a character of @c char_type to a character of @c char,
       *  if possible.
       *
       *  Returns the result of
       *  @code
       *    std::use_facet<ctype<char_type> >(getloc()).narrow(c,dfault)
       *  @endcode
       *
       *  Additional l10n notes are at
       *  http://gcc.gnu.org/onlinedocs/libstdc++/manual/localization.html
      */
      char
      narrow(char_type __c, char __dfault) const
      { return __check_facet(_M_ctype).narrow(__c, __dfault); }

/**
       *  @brief  Widens characters.
       *  @param  __c  The character to widen.
       *  @return  The widened character.
       *
       *  Maps a character of @c char to a character of @c char_type.
       *
       *  Returns the result of
       *  @code
       *    std::use_facet<ctype<char_type> >(getloc()).widen(c)
       *  @endcode
       *
       *  Additional l10n notes are at
       *  http://gcc.gnu.org/onlinedocs/libstdc++/manual/localization.html
      */
      char_type
      widen(char __c) const
      { return __check_facet(_M_ctype).widen(__c); }

protected:
      // 27.4.5.1  basic_ios constructors
      /**
       *  @brief  Empty.
       *
       *  The default constructor does nothing and is not normally
       *  accessible to users.
      */
      basic_ios()
      : ios_base(), _M_tie(0), _M_fill(char_type()), _M_fill_init(false), 
	_M_streambuf(0), _M_ctype(0), _M_num_put(0), _M_num_get(0)
      { }

/**
       *  @brief  All setup is performed here.
       *
       *  This is called from the public constructor.  It is not virtual and
       *  cannot be redefined.
      */
      void
      init(basic_streambuf<_CharT, _Traits>* __sb);

#if __cplusplus >= 201103L
      basic_ios(const basic_ios&) = delete;
      basic_ios& operator=(const basic_ios&) = delete;

void
      move(basic_ios& __rhs)
      {
	ios_base::_M_move(__rhs);
	_M_cache_locale(_M_ios_locale);
	this->tie(__rhs.tie(nullptr));
	_M_fill = __rhs._M_fill;
	_M_fill_init = __rhs._M_fill_init;
	_M_streambuf = nullptr;
      }

void
      move(basic_ios&& __rhs)
      { this->move(__rhs); }

void
      swap(basic_ios& __rhs) noexcept
      {
	ios_base::_M_swap(__rhs);
	_M_cache_locale(_M_ios_locale);
	__rhs._M_cache_locale(__rhs._M_ios_locale);
	std::swap(_M_tie, __rhs._M_tie);
	std::swap(_M_fill, __rhs._M_fill);
	std::swap(_M_fill_init, __rhs._M_fill_init);
      }

void
      set_rdbuf(basic_streambuf<_CharT, _Traits>* __sb)
      { _M_streambuf = __sb; }
#endif

void
      _M_cache_locale(const locale& __loc);
    };

_GLIBCXX_END_NAMESPACE_VERSION
} // namespace

#include <bits/basic_ios.tcc>

#endif /* _BASIC_IOS_H */

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