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145 lines
2.6 KiB
C++
145 lines
2.6 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 Engine, size_t w, class UIntType>
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// class independent_bits_engine
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// result_type operator()();
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#include <random>
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#include <cassert>
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#include "test_macros.h"
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template <class UIntType, UIntType Min, UIntType Max>
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class rand1
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{
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public:
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// types
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typedef UIntType result_type;
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private:
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result_type x_;
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static_assert(Min < Max, "rand1 invalid parameters");
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public:
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#if TEST_STD_VER < 11 && defined(_LIBCPP_VERSION)
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// Workaround for lack of constexpr in C++03
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static const result_type _Min = Min;
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static const result_type _Max = Max;
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#endif
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static TEST_CONSTEXPR result_type min() {return Min;}
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static TEST_CONSTEXPR result_type max() {return Max;}
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explicit rand1(result_type sd = Min) : x_(sd)
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{
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if (x_ > Max)
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x_ = Max;
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}
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result_type operator()()
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{
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result_type r = x_;
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if (x_ < Max)
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++x_;
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else
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x_ = Min;
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return r;
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}
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};
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void
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test1()
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{
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typedef std::independent_bits_engine<rand1<unsigned, 0, 10>, 16, unsigned> E;
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E e;
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assert(e() == 6958);
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}
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void
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test2()
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{
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typedef std::independent_bits_engine<rand1<unsigned, 0, 100>, 16, unsigned> E;
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E e;
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assert(e() == 66);
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}
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void
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test3()
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{
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typedef std::independent_bits_engine<rand1<unsigned, 0, 0xFFFFFFFF>, 32, unsigned> E;
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E e(5);
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assert(e() == 5);
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}
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void
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test4()
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{
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typedef std::independent_bits_engine<rand1<unsigned, 0, 0xFFFFFFFF>, 7, unsigned> E;
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E e(129);
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assert(e() == 1);
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}
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void
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test5()
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{
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typedef std::independent_bits_engine<rand1<unsigned, 2, 3>, 1, unsigned> E;
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E e(6);
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assert(e() == 1);
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}
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void
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test6()
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{
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typedef std::independent_bits_engine<rand1<unsigned, 2, 3>, 11, unsigned> E;
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E e(6);
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assert(e() == 1365);
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}
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void
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test7()
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{
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typedef std::independent_bits_engine<rand1<unsigned, 2, 3>, 32, unsigned> E;
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E e(6);
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assert(e() == 2863311530u);
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}
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void
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test8()
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{
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typedef std::independent_bits_engine<std::mt19937, 64, unsigned long long> E;
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E e(6);
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assert(e() == 16470362623952407241ull);
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}
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int main(int, char**)
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{
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test1();
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test2();
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test3();
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test4();
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test5();
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test6();
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test7();
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test8();
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return 0;
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}
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