libcxx/test/std/numerics/rand/rand.eng/rand.eng.lcong/default.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 // <random>
  10
  11 // template <class UIntType, UIntType a, UIntType c, UIntType m>
  12 //   class linear_congruential_engine;
  13
  14 // linear_congruential_engine();
  15
  16 #include <random>
  17 #include <cassert>
  18
  19 #include "test_macros.h"
  20
  21 template <class T, T a, T c, T m>
  22 void
  23 test1()
  24 {
  25     typedef std::linear_congruential_engine<T, a, c, m> LCE;
  26     LCE e1;
  27     LCE e2;
  28     e2.seed();
  29     assert(e1 == e2);
  30 }
  31
  32 template <class T>
  33 void
  34 test()
  35 {
  36     test1<T, 0, 0, 0>();
  37     test1<T, 0, 1, 2>();
  38     test1<T, 1, 1, 2>();
  39     const T M(static_cast<T>(-1));
  40     test1<T, 0, 0, M>();
  41     test1<T, 0, M-2, M>();
  42     test1<T, 0, M-1, M>();
  43     test1<T, M-2, 0, M>();
  44     test1<T, M-2, M-2, M>();
  45     test1<T, M-2, M-1, M>();
  46     test1<T, M-1, 0, M>();
  47     test1<T, M-1, M-2, M>();
  48     test1<T, M-1, M-1, M>();
  49 }
  50
  51 int main(int, char**)
  52 {
  53     test<unsigned short>();
  54     test<unsigned int>();
  55     test<unsigned long>();
  56     test<unsigned long long>();
  57
  58   return 0;
  59 }