libcxx/test/numerics/rand/rand.eng/rand.eng.lcong/default.pass.cpp

//===----------------------------------------------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

// <random>

// template <class UIntType, UIntType a, UIntType c, UIntType m>
//   class linear_congruential_engine;

// linear_congruential_engine();

#include <random>
#include <cassert>

template <class T, T a, T c, T m>
void
test1()
{
    typedef std::linear_congruential_engine<T, a, c, m> LCE;
    typedef typename LCE::result_type result_type;
    LCE e1;
    LCE e2;
    e2.seed();
    assert(e1 == e2);
}

template <class T>
void
test()
{
    test1<T, 0, 0, 0>();
    test1<T, 0, 1, 2>();
    test1<T, 1, 1, 2>();
    const T M(~0);
    test1<T, 0, 0, M>();
    test1<T, 0, M-2, M>();
    test1<T, 0, M-1, M>();
    test1<T, M-2, 0, M>();
    test1<T, M-2, M-2, M>();
    test1<T, M-2, M-1, M>();
    test1<T, M-1, 0, M>();
    test1<T, M-1, M-2, M>();
    test1<T, M-1, M-1, M>();
}

int main()
{
    test<unsigned short>();
    test<unsigned int>();
    test<unsigned long>();
    test<unsigned long long>();
}