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97 lines
2.5 KiB
C++
97 lines
2.5 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// <random>
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// template <class UIntType, UIntType a, UIntType c, UIntType m>
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// class linear_congruential_engine
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// {
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// public:
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// engine characteristics
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// static constexpr result_type multiplier = a;
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// static constexpr result_type increment = c;
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// static constexpr result_type modulus = m;
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// static constexpr result_type min() { return c == 0u ? 1u: 0u;}
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// static constexpr result_type max() { return m - 1u;}
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// static constexpr result_type default_seed = 1u;
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#include <random>
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#include <type_traits>
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#include <cassert>
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#include "test_macros.h"
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template <class T>
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void where(const T &) {}
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template <class T, T a, T c, T m>
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void
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test1()
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{
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typedef std::linear_congruential_engine<T, a, c, m> LCE;
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typedef typename LCE::result_type result_type;
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static_assert((LCE::multiplier == a), "");
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static_assert((LCE::increment == c), "");
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static_assert((LCE::modulus == m), "");
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#if TEST_STD_VER >= 11
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static_assert((LCE::min() == (c == 0u ? 1u: 0u)), "");
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#else
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assert((LCE::min() == (c == 0u ? 1u: 0u)));
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#endif
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#ifdef TEST_COMPILER_C1XX
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#pragma warning(push)
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#pragma warning(disable: 4310) // cast truncates constant value
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#endif // TEST_COMPILER_C1XX
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#if TEST_STD_VER >= 11
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static_assert((LCE::max() == result_type(m - 1u)), "");
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#else
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assert((LCE::max() == result_type(m - 1u)));
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#endif
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#ifdef TEST_COMPILER_C1XX
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#pragma warning(pop)
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#endif // TEST_COMPILER_C1XX
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static_assert((LCE::default_seed == 1), "");
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where(LCE::multiplier);
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where(LCE::increment);
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where(LCE::modulus);
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where(LCE::default_seed);
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}
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template <class T>
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void
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test()
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{
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test1<T, 0, 0, 0>();
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test1<T, 0, 1, 2>();
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test1<T, 1, 1, 2>();
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const T M(static_cast<T>(-1));
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test1<T, 0, 0, M>();
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test1<T, 0, M-2, M>();
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test1<T, 0, M-1, M>();
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test1<T, M-2, 0, M>();
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test1<T, M-2, M-2, M>();
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test1<T, M-2, M-1, M>();
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test1<T, M-1, 0, M>();
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test1<T, M-1, M-2, M>();
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test1<T, M-1, M-1, M>();
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}
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int main(int, char**)
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{
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test<unsigned short>();
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test<unsigned int>();
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test<unsigned long>();
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test<unsigned long long>();
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return 0;
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}
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