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 w, class UIntType> 13 // class independent_bits_engine 14 // { 15 // public: 16 // // types 17 // typedef UIntType result_type; 18 19 #include <random> 20 #include <type_traits> 21 22 template <class UIntType, UIntType Min, UIntType Max> 23 class rand1 24 { 25 public: 26 // types 27 typedef UIntType result_type; 28 29 private: 30 result_type x_; 31 32 static_assert(Min < Max, "rand1 invalid parameters"); 33 public: 34 35 #ifdef _LIBCPP_HAS_NO_CONSTEXPR 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 _LIBCPP_CONSTEXPR result_type min() {return Min;} 42 static _LIBCPP_CONSTEXPR result_type max() {return Max;} 43 44 explicit rand1(result_type sd = Min) : x_(sd) 45 { 46 if (x_ < Min) 47 x_ = Min; 48 if (x_ > Max) 49 x_ = Max; 50 } 51 52 result_type operator()() 53 { 54 result_type r = x_; 55 if (x_ < Max) 56 ++x_; 57 else 58 x_ = Min; 59 return r; 60 } 61 }; 62 63 void 64 test1() 65 { 66 static_assert((std::is_same< 67 std::independent_bits_engine<rand1<unsigned long, 0, 10>, 16, unsigned>::result_type, 68 unsigned>::value), ""); 69 } 70 71 void 72 test2() 73 { 74 static_assert((std::is_same< 75 std::independent_bits_engine<rand1<unsigned long, 0, 10>, 16, unsigned long long>::result_type, 76 unsigned long long>::value), ""); 77 } 78 79 int main() 80 { 81 test1(); 82 test2(); 83 } 84
