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

   1 // Iostreams base classes -*- C++ -*-
   2
   3 // Copyright (C) 1997, 1998, 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_H
  31 #define _CPP_BITS_BASICIOS_H 1
  32
  33 #pragma GCC system_header
  34
  35 #include <bits/streambuf_iterator.h>
  36 #include <bits/locale_facets.h>
  37
  38 namespace std
  39 {
  40   // 27.4.5  Template class basic_ios
  41   template<typename _CharT, typename _Traits>
  42     class basic_ios : public ios_base
  43     {
  44     public:
  45       // Types:
  46       typedef _CharT                            char_type;
  47       typedef typename _Traits::int_type        int_type;
  48       typedef typename _Traits::pos_type        pos_type;
  49       typedef typename _Traits::off_type        off_type;
  50       typedef _Traits                           traits_type;
  51
  52       // Non-standard Types:
  53       typedef ctype<_CharT>                             __ctype_type;
  54       typedef ostreambuf_iterator<_CharT, _Traits>      __ostreambuf_iter;
  55       typedef num_put<_CharT, __ostreambuf_iter>        __numput_type;
  56       typedef istreambuf_iterator<_CharT, _Traits>      __istreambuf_iter;
  57       typedef num_get<_CharT, __istreambuf_iter>        __numget_type;
  58
  59       // Data members:
  60     private:
  61       basic_ostream<_CharT, _Traits>*   _M_tie;
  62       char_type                         _M_fill;
  63       iostate                           _M_exception;
  64
  65     protected:
  66       basic_streambuf<_CharT, _Traits>* _M_streambuf;
  67       iostate                           _M_streambuf_state;
  68
  69       // Cached use_facet<ctype>, which is based on the current locale info.
  70       const __ctype_type*               _M_ios_fctype;
  71       // From ostream.
  72       const __numput_type*              _M_fnumput;
  73       // From istream.
  74       const __numget_type*              _M_fnumget;
  75
  76     public:
  77       inline const __ctype_type*
  78       _M_get_fctype_ios(void)
  79       { return _M_ios_fctype; }
  80
  81       operator void*() const
  82       { return this->fail() ? 0 : const_cast<basic_ios*>(this); }
  83
  84       inline bool
  85       operator!() const
  86       { return this->fail(); }
  87
  88       inline iostate
  89       rdstate() const
  90       { return _M_streambuf_state; }
  91
  92       inline void
  93       clear(iostate __state = goodbit)
  94       {
  95         if (this->rdbuf())
  96           _M_streambuf_state = __state;
  97         else
  98           _M_streambuf_state = __state | badbit;
  99         if ((this->rdstate() & this->exceptions()))
 100           __throw_ios_failure("basic_ios::clear(iostate) caused exception");
 101       }
 102
 103       inline void
 104       setstate(iostate __state)
 105       { this->clear(this->rdstate() | __state); }
 106
 107       inline bool
 108       good() const
 109       { return this->rdstate() == 0; }
 110
 111       inline bool
 112       eof() const
 113       { return (this->rdstate() & eofbit) != 0; }
 114
 115       inline bool
 116       fail() const
 117       { return (this->rdstate() & (badbit | failbit)) != 0; }
 118
 119       inline bool
 120       bad() const
 121       { return (this->rdstate() & badbit) != 0; }
 122
 123       inline iostate
 124       exceptions() const
 125       { return _M_exception; }
 126
 127       inline void
 128       exceptions(iostate __except)
 129       {
 130         _M_exception = __except;
 131         this->clear(_M_streambuf_state);
 132       }
 133
 134       // Constructor/destructor:
 135       explicit
 136       basic_ios(basic_streambuf<_CharT, _Traits>* __sb) : ios_base()
 137       { this->init(__sb); }
 138
 139       virtual
 140       ~basic_ios() { }
 141
 142       // Members:
 143       inline basic_ostream<_CharT, _Traits>*
 144       tie() const
 145       { return _M_tie; }
 146
 147       inline basic_ostream<_CharT, _Traits>*
 148       tie(basic_ostream<_CharT, _Traits>* __tiestr)
 149       {
 150         basic_ostream<_CharT, _Traits>* __old = _M_tie;
 151         _M_tie = __tiestr;
 152         return __old;
 153       }
 154
 155       inline basic_streambuf<_CharT, _Traits>*
 156       rdbuf() const
 157       { return _M_streambuf; }
 158
 159       basic_streambuf<_CharT, _Traits>*
 160       rdbuf(basic_streambuf<_CharT, _Traits>* __sb);
 161
 162       basic_ios&
 163       copyfmt(const basic_ios& __rhs);
 164
 165       inline char_type
 166       fill() const
 167       { return _M_fill; }
 168
 169       inline char_type
 170       fill(char_type __ch)
 171       {
 172         char_type __old = _M_fill;
 173         _M_fill = __ch;
 174         return __old;
 175       }
 176
 177       // Locales:
 178       locale
 179       imbue(const locale& __loc);
 180
 181       char
 182       narrow(char_type __c, char __dfault) const;
 183
 184       char_type
 185       widen(char __c) const;
 186
 187     protected:
 188       // 27.4.5.1  basic_ios constructors
 189       basic_ios() : ios_base()
 190       { }
 191
 192       void
 193       init(basic_streambuf<_CharT, _Traits>* __sb);
 194
 195       bool
 196       _M_check_facet(const locale::facet* __f)
 197       {
 198         bool __ret = false;
 199         if (__f)
 200           __ret = true;
 201         else
 202           __throw_bad_cast();
 203         return __ret;
 204       }
 205
 206       void
 207       _M_cache_facets(const locale& __loc);
 208     };
 209 } // namespace std
 210
 211 #ifdef _GLIBCPP_NO_TEMPLATE_EXPORT
 212 # define export
 213 #include <bits/basic_ios.tcc>
 214 #endif
 215
 216 #endif /* _CPP_BITS_BASICIOS_H */
 217
 218