forked from OSchip/llvm-project
94 lines
1.8 KiB
C++
94 lines
1.8 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// <random>
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// template<class Engine, size_t k>
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// class shuffle_order_engine
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// result_type operator()();
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#include <random>
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#include <cassert>
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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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#ifdef _LIBCPP_HAS_NO_CONSTEXPR
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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 _LIBCPP_CONSTEXPR result_type min() {return Min;}
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static _LIBCPP_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::knuth_b E;
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E e;
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assert(e() == 152607844u);
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}
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void
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test2()
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{
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typedef rand1<unsigned long long, 0, 0xFFFFFFFFFFFFFFFFull> E0;
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typedef std::shuffle_order_engine<E0, 101> E;
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E e;
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e.discard(400);
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assert(e() == 501);
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}
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void
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test3()
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{
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typedef rand1<unsigned long long, 0, 0xFFFFFFFFFFFFFFFFull> E0;
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typedef std::shuffle_order_engine<E0, 100> E;
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E e;
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e.discard(400);
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assert(e() == 500);
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}
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int main()
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{
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test1();
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test2();
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test3();
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}
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