libstdc++-v3/testsuite/26_numerics/random/linear_congruential_engine/operators/call.cc

   1 // Copyright (C) 2020-2023 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 3, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18 // { dg-do run { target c++11 } }
  19
  20 #include <random>
  21 #include <testsuite_hooks.h>
  22
  23 void
  24 test01()
  25 {
  26   std::linear_congruential_engine<unsigned, 0, 0, 0> l;
  27   auto r = l(); // this used to result in divide by zero
  28   VERIFY( r == 0 );
  29   l.seed(2);
  30   r = l();
  31   VERIFY( r == 0 );
  32   VERIFY( l() == 0 );
  33 }
  34
  35 void
  36 test02()
  37 {
  38   std::linear_congruential_engine<unsigned, 0, 0, 3> l;
  39   auto r = l(); // this used to result in a different divide by zero
  40   VERIFY( r == 0 );
  41   l.seed(2);
  42   r = l();
  43   VERIFY( r == 0 );
  44   VERIFY( l() == 0 );
  45 }
  46
  47 void
  48 test03()
  49 {
  50   std::linear_congruential_engine<unsigned, 0, 2, 3> l;
  51   auto r = l();
  52   VERIFY( r == 2 );
  53   l.seed(4);
  54   r = l();
  55   VERIFY( r == 2 );
  56   VERIFY( l() == 2 );
  57 }
  58
  59 int main()
  60 {
  61   test01();
  62   test02();
  63   test03();
  64 }