libstdc++-v3/testsuite/testsuite_io.h

   1 // -*- C++ -*-
   2 // Testing filebuf for the C++ library testsuite.
   3 //
   4 // Copyright (C) 2003 Free Software Foundation, Inc.
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 2, or (at your option)
  10 // any later version.
  11 //
  12 // This library is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16 //
  17 // You should have received a copy of the GNU General Public License along
  18 // with this library; see the file COPYING.  If not, write to the Free
  19 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  20 // USA.
  21 //
  22 // As a special exception, you may use this file as part of a free software
  23 // library without restriction.  Specifically, if other files instantiate
  24 // templates or use macros or inline functions from this file, or you compile
  25 // this file and link it with other files to produce an executable, this
  26 // file does not by itself cause the resulting executable to be covered by
  27 // the GNU General Public License.  This exception does not however
  28 // invalidate any other reasons why the executable file might be covered by
  29 // the GNU General Public License.
  30
  31 #ifndef _GLIBCXX_TESTSUITE_IO_H
  32 #define _GLIBCXX_TESTSUITE_IO_H
  33
  34 #include <fstream>
  35
  36 namespace __gnu_cxx_test
  37 {
  38   // Used to verify the constraints/requirements on get and put areas
  39   // as defined in
  40   // 27.5.1 - Stream buffer requirements: get and put areas
  41   // 27.8.1.1 - Template class basic_filebuf p 3
  42   //   If the file is not open (ios_base::in) -> input seq. cannot be read
  43   //   If the file is not open (ios_base::out) -> output seq. cannot be written
  44   //   Joint file position
  45   // 27.8.1.4 - Overridden virtual functions p9
  46   //   If unbuffered, pbase == pptr == NULL
  47   class constraint_filebuf: public std::filebuf
  48   {
  49   public:
  50     bool
  51     write_position()
  52     {
  53       bool two = this->pptr() != NULL;
  54       bool one = this->pptr() < this->epptr();
  55       return one && two;
  56     }
  57
  58     bool
  59     read_position()
  60     {
  61       bool one = this->gptr() != NULL;
  62       bool two = this->gptr() < this->egptr();
  63
  64       return one && two;
  65     }
  66
  67     bool
  68     unbuffered()
  69     {
  70       bool one = this->pbase() == NULL;
  71       bool two = this->pptr() == NULL;
  72       return one && two;
  73     }
  74
  75   };
  76 }; // namespace __gnu_cxx_test
  77
  78 #endif // _GLIBCXX_TESTSUITE_IO_H
  79