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7c3769df62
to reflect the new license. These used slightly different spellings that defeated my regular expressions. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@351648 91177308-0d34-0410-b5e6-96231b3b80d8
95 lines
1.8 KiB
C++
95 lines
1.8 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 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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#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::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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