libcxx/test/std/numerics/rand/rand.eng/rand.eng.lcong/io.pass.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 // UNSUPPORTED: no-localization
  10
  11 // <random>
  12
  13 // template <class UIntType, UIntType a, UIntType c, UIntType m>
  14 //   class linear_congruential_engine;
  15
  16 // template <class charT, class traits,
  17 //           class UIntType, UIntType a, UIntType c, UIntType m>
  18 // basic_ostream<charT, traits>&
  19 // operator<<(basic_ostream<charT, traits>& os,
  20 //            const linear_congruential_engine<UIntType, a, c, m>& x);
  21 //
  22 // template <class charT, class traits,
  23 //           class UIntType, UIntType a, UIntType c, UIntType m>
  24 // basic_istream<charT, traits>&
  25 // operator>>(basic_istream<charT, traits>& is,
  26 //            linear_congruential_engine<UIntType, a, c, m>& x);
  27
  28 #include <random>
  29 #include <sstream>
  30 #include <cassert>
  31
  32 #include "test_macros.h"
  33
  34 int main(int, char**)
  35 {
  36     {
  37         typedef std::linear_congruential_engine<unsigned, 48271, 0, 2147483647> E;
  38         E e1;
  39         e1.discard(100);
  40         std::ostringstream os;
  41         os << e1;
  42         std::istringstream is(os.str());
  43         E e2;
  44         is >> e2;
  45         assert(e1 == e2);
  46     }
  47
  48   return 0;
  49 }