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

   1 // 1999-09-20 bkoz
   2
   3 // Copyright (C) 1999-2020 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   typedef std::mbstate_t state_type;
  31
  32   std::streamoff off01;
  33   std::streamoff off02 = 997;
  34   int i02 = 999;
  35
  36   // p(i), p = i
  37   std::streampos pos01(i02);
  38   std::streampos pos02 = i02;
  39   VERIFY( pos01 == pos02 );
  40
  41   // p(o), p = o
  42   // NB: P(o) is only required.
  43   std::streampos pos03(off02);
  44   std::streampos pos04 = off02;
  45   VERIFY( pos03 == pos04 );
  46
  47   // O(p)
  48   std::streamoff off03(pos04);
  49   VERIFY( off03 == off02 );
  50
  51   // p == q, p!= q
  52   VERIFY( pos01 == pos02 );
  53   VERIFY( pos02 != pos03 );
  54
  55   // q = p + o
  56   // p += o
  57   pos03 = pos03 + off02;
  58   pos04 += off02;
  59   VERIFY( pos03 == pos04 );
  60   std::streampos pos05 = pos03;
  61   VERIFY ( pos05 == pos03 );
  62
  63   // q = p - o
  64   // p -= o
  65   pos03 = pos03 - off02;
  66   pos04 -= off02;
  67   VERIFY( pos03 == pos04 );
  68   std::streampos pos07 = pos03;
  69   VERIFY ( pos07 == pos03 );
  70
  71   // o = p - q
  72   VERIFY( 0 == pos03 - pos04 );
  73
  74   // streamsize -> streamoff
  75   // streamoff -> streamsize
  76   off01 = off02;
  77   std::streamsize size01(off02);
  78   std::streamoff off04(size01);
  79   VERIFY( off01 == off04 );
  80 }
  81
  82 int main()
  83 {
  84   test02();
  85   return 0;
  86 }