libstdc++-v3/testsuite/27_io/fpos/mbstate_t/2.cc

   1 // 1999-09-20 bkoz
   2
   3 // Copyright (C) 1999, 2001, 2003, 2009, 2010 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 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING3.  If not see
  18 // <http://www.gnu.org/licenses/>.
  19
  20
  21 // 27.4.3 template class fpos
  22
  23 #include <cwchar> // for mbstate_t
  24 #include <ios>
  25 #include <testsuite_hooks.h>
  26
  27 // 27.4.3.2 fpos requirements/invariants
  28 void test02()
  29 {
  30   bool test __attribute__((unused)) = true;
  31
  32   typedef std::mbstate_t state_type;
  33
  34   std::streamoff off01;
  35   std::streamoff off02 = 997;
  36   int i02 = 999;
  37
  38   // p(i), p = i
  39   std::streampos pos01(i02);
  40   std::streampos pos02 = i02;
  41   VERIFY( pos01 == pos02 );
  42
  43   // p(o), p = o
  44   // NB: P(o) is only required.
  45   std::streampos pos03(off02);
  46   std::streampos pos04 = off02;
  47   VERIFY( pos03 == pos04 );
  48
  49   // O(p)
  50   std::streamoff off03(pos04);
  51   VERIFY( off03 == off02 );
  52
  53   // p == q, p!= q
  54   VERIFY( pos01 == pos02 );
  55   VERIFY( pos02 != pos03 );
  56
  57   // q = p + o
  58   // p += o
  59   pos03 = pos03 + off02;
  60   pos04 += off02;
  61   VERIFY( pos03 == pos04 );
  62   std::streampos pos05 = pos03;
  63   VERIFY ( pos05 == pos03 );
  64
  65   // q = p - o
  66   // p -= o
  67   pos03 = pos03 - off02;
  68   pos04 -= off02;
  69   VERIFY( pos03 == pos04 );
  70   std::streampos pos07 = pos03;
  71   VERIFY ( pos07 == pos03 );
  72
  73   // o = p - q
  74   VERIFY( 0 == pos03 - pos04 );
  75
  76   // streamsize -> streamoff
  77   // streamoff -> streamsize
  78   off01 = off02;
  79   std::streamsize size01(off02);
  80   std::streamoff off04(size01);
  81   VERIFY( off01 == off04 );
  82 }
  83
  84 int main()
  85 {
  86   test02();
  87   return 0;
  88 }