libstdc++-v3/testsuite/26_numerics/random/discard_block_engine/operators/serialize.cc

   1 // { dg-do run { target c++11 } }
   2 // { dg-require-cstdint "" }
   3 //
   4 // 2008-11-24  Edward M. Smith-Rowland <3dw4rd@verizon.net>
   5 //
   6 // Copyright (C) 2008-2020 Free Software Foundation, Inc.
   7 //
   8 // This file is part of the GNU ISO C++ Library.  This library is free
   9 // software; you can redistribute it and/or modify it under the
  10 // terms of the GNU General Public License as published by the
  11 // Free Software Foundation; either version 3, or (at your option)
  12 // any later version.
  13 //
  14 // This library is distributed in the hope that it will be useful,
  15 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 // GNU General Public License for more details.
  18 //
  19 // You should have received a copy of the GNU General Public License along
  20 // with this library; see the file COPYING3.  If not see
  21 // <http://www.gnu.org/licenses/>.
  22
  23 // 26.4.4.1 class template discard_block_engine [rand.adapt.disc]
  24 // 26.4.2.3 concept RandomNumberEngineAdaptor [rand.concept.adapt]
  25
  26 #include <random>
  27 #include <sstream>
  28 #include <testsuite_hooks.h>
  29
  30 void
  31 test01()
  32 {
  33   std::stringstream str;
  34   std::discard_block_engine
  35     <
  36     std::subtract_with_carry_engine<unsigned long, 24, 10, 24>,
  37     389, 24
  38     > u, v;
  39
  40   u(); // advance
  41   str << u;
  42
  43   VERIFY( !(u == v) );
  44
  45   str >> v;
  46   VERIFY( u == v );
  47   for (unsigned i = 0; i < 1000; ++i)
  48     VERIFY( u() == v() );
  49
  50   str.clear();
  51   str << v;
  52
  53   u();
  54   u();
  55   u();
  56
  57   str >> u;
  58   VERIFY( u == v );
  59   for (unsigned i = 0; i < 1000; ++i)
  60     VERIFY( u() == v() );
  61 }
  62
  63 int main()
  64 {
  65   test01();
  66   return 0;
  67 }