libstdc++-v3/testsuite/tr1/5_numerical_facilities/random/subtract_with_carry/cons/gen1.cc

   1 // 2006-06-04  Stephen M. Webb <stephen.webb@bregmasoft.com>
   2 //
   3 // Copyright (C) 2006 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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  19 // USA.
  20
  21 // 5.1.4.3 class template subtract_with_carry [tr.rand.eng.sub]
  22 // 5.1.1 Table 16 line 3 Gen ctor
  23
  24 #include <ctime>
  25 #include <tr1/random>
  26 #include <testsuite_hooks.h>
  27
  28 // a not untypical initialization function
  29 unsigned long
  30 gen()
  31 {
  32   return std::time(0);
  33 }
  34
  35 void
  36 test01()
  37 {
  38   bool test __attribute__((unused)) = true;
  39   using namespace std::tr1;
  40
  41   subtract_with_carry<unsigned long, (1UL << 24), 10, 24> x(gen);
  42   VERIFY( x.min() == 0 );
  43   VERIFY( x.max() == ((1 << 24) - 1) );
  44 }
  45
  46 int main()
  47 {
  48   test01();
  49   return 0;
  50 }