libstdc++-v3/bits/basic_ios.h

   1 // Iostreams base classes -*- C++ -*-
   2
   3 // Copyright (C) 1997-1999 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 #include <bits/sbuf_iter.h>
  34
  35 namespace std {
  36
  37   // 27.4.5  Template class basic_ios
  38   template<typename _CharT, typename _Traits>
  39     class basic_ios : public ios_base
  40     {
  41     public:
  42
  43       // Types:
  44       typedef _CharT                            char_type;
  45       typedef typename _Traits::int_type        int_type;
  46       typedef typename _Traits::pos_type        pos_type;
  47       typedef typename _Traits::off_type        off_type;
  48       typedef _Traits                           traits_type;
  49
  50       // Non-standard Types:
  51       typedef ctype<_CharT>                     __ctype_type;
  52       // From ostream
  53       typedef ostreambuf_iterator<_CharT>               __ostreambuf_iter;
  54       typedef num_put<_CharT, __ostreambuf_iter>        __numput_type;
  55       typedef istreambuf_iterator<_CharT>               __istreambuf_iter;
  56       typedef num_get<_CharT, __istreambuf_iter>        __numget_type;
  57
  58       // Data members:
  59     private:
  60       basic_ostream<_CharT, _Traits>*   _M_tie;
  61       char_type                         _M_fill;
  62       iostate                           _M_exception;
  63
  64     protected:
  65       basic_streambuf<_CharT, _Traits>* _M_streambuf;
  66       iostate                           _M_streambuf_state;
  67
  68       // Cached use_facet<ctype>, which is based on the current locale info.
  69       const __ctype_type*               _M_ios_fctype;
  70       // From ostream.
  71       const __numput_type*              _M_fnumput;
  72       // From istream.
  73       const __numget_type*              _M_fnumget;
  74
  75     public:
  76
  77       inline const __ctype_type*
  78       _M_get_fctype_ios(void)
  79       { return _M_ios_fctype; }
  80
  81       inline const __numget_type*
  82       _M_get_fnumget(void)
  83       { return _M_fnumget; }
  84
  85       inline const __numput_type*
  86       _M_get_fnumput(void)
  87       { return _M_fnumput; }
  88
  89       operator void*() const
  90       { return this->fail() ? 0 : const_cast<basic_ios*>(this); }
  91
  92       inline bool
  93       operator!() const
  94       { return this->fail(); }
  95
  96       inline iostate
  97       rdstate() const
  98       { return _M_streambuf_state; }
  99
 100       inline void
 101       clear(iostate __state = goodbit)
 102       {
 103         if (this->rdbuf())
 104           _M_streambuf_state = __state;
 105         else
 106           _M_streambuf_state = __state | badbit;
 107         if ((this->rdstate() & this->exceptions()))
 108           throw failure("basic_ios::clear(iostate) caused exception");
 109       }
 110
 111       inline void
 112       setstate(iostate __state)
 113       { this->clear(this->rdstate() | __state); }
 114
 115       inline bool
 116       good() const
 117       { return this->rdstate() == 0; }
 118
 119       inline bool
 120       eof() const
 121       { return (this->rdstate() & eofbit) != 0; }
 122
 123       inline bool
 124       fail() const
 125       { return (this->rdstate() & (badbit | failbit)) != 0; }
 126
 127       inline bool
 128       bad() const
 129       { return (this->rdstate() & badbit) != 0; }
 130
 131       inline iostate
 132       exceptions() const
 133       { return _M_exception; }
 134
 135       inline void
 136       exceptions(iostate __except)
 137       {
 138         _M_exception = __except;
 139         this->clear(_M_streambuf_state);
 140       }
 141
 142       // Constructor/destructor:
 143       explicit
 144       basic_ios(basic_streambuf<_CharT, _Traits>* __sb) : ios_base()
 145       { this->init(__sb); }
 146
 147       virtual
 148       ~basic_ios() { }
 149
 150       // Members:
 151       inline basic_ostream<_CharT, _Traits>*
 152       tie() const
 153       { return _M_tie; }
 154
 155       inline basic_ostream<_CharT, _Traits>*
 156       tie(basic_ostream<_CharT, _Traits>* __tiestr)
 157       {
 158         basic_ostream<_CharT, _Traits>* __old = _M_tie;
 159         _M_tie = __tiestr;
 160         return __old;
 161       }
 162
 163       inline basic_streambuf<_CharT, _Traits>*
 164       rdbuf() const
 165       { return _M_streambuf; }
 166
 167       basic_streambuf<_CharT, _Traits>*
 168       rdbuf(basic_streambuf<_CharT, _Traits>* __sb);
 169
 170       basic_ios&
 171       copyfmt(const basic_ios& __rhs);
 172
 173       inline char_type
 174       fill() const
 175       { return _M_fill; }
 176
 177       inline char_type
 178       fill(char_type __ch)
 179       {
 180         char_type __old = _M_fill;
 181         _M_fill = __ch;
 182         return __old;
 183       }
 184
 185       // Locales:
 186       locale
 187       imbue(const locale& __loc);
 188
 189       char
 190       narrow(char_type __c, char __dfault) const;
 191
 192       char_type
 193       widen(char __c) const;
 194
 195     protected:
 196       // 27.4.5.1  basic_ios constructors
 197       basic_ios() : ios_base()
 198       { }
 199
 200       void
 201       init(basic_streambuf<_CharT, _Traits>* __sb);
 202     };
 203
 204 } // namespace std
 205
 206 #ifdef _GLIBCPP_NO_TEMPLATE_EXPORT
 207 # define export
 208 //#include <bits/basic_ios.tcc>
 209 #endif
 210
 211 #endif /* _CPP_BITS_BASICIOS_H */
 212
 213
 214
 215
 216