1//===----------------------------------------------------------------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is dual licensed under the MIT and the University of Illinois Open 6// Source Licenses. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9 10// <random> 11 12// template<class Engine, size_t k> 13// class shuffle_order_engine 14 15// result_type operator()(); 16 17#include <random> 18#include <cassert> 19 20#include "test_macros.h" 21 22template <class UIntType, UIntType Min, UIntType Max> 23class rand1 24{ 25public: 26 // types 27 typedef UIntType result_type; 28 29private: 30 result_type x_; 31 32 static_assert(Min < Max, "rand1 invalid parameters"); 33public: 34 35#if TEST_STD_VER < 11 && defined(_LIBCPP_VERSION) 36 // Workaround for lack of constexpr in C++03 37 static const result_type _Min = Min; 38 static const result_type _Max = Max; 39#endif 40 41 static TEST_CONSTEXPR result_type min() {return Min;} 42 static TEST_CONSTEXPR result_type max() {return Max;} 43 44 explicit rand1(result_type sd = Min) : x_(sd) 45 { 46 if (x_ > Max) 47 x_ = Max; 48 } 49 50 result_type operator()() 51 { 52 result_type r = x_; 53 if (x_ < Max) 54 ++x_; 55 else 56 x_ = Min; 57 return r; 58 } 59}; 60 61void 62test1() 63{ 64 typedef std::knuth_b E; 65 66 E e; 67 assert(e() == 152607844u); 68} 69 70void 71test2() 72{ 73 typedef rand1<unsigned long long, 0, 0xFFFFFFFFFFFFFFFFull> E0; 74 typedef std::shuffle_order_engine<E0, 101> E; 75 E e; 76 e.discard(400); 77 assert(e() == 501); 78} 79 80void 81test3() 82{ 83 typedef rand1<unsigned long long, 0, 0xFFFFFFFFFFFFFFFFull> E0; 84 typedef std::shuffle_order_engine<E0, 100> E; 85 E e; 86 e.discard(400); 87 assert(e() == 500); 88} 89 90int main() 91{ 92 test1(); 93 test2(); 94 test3(); 95} 96