181ad6265SDimitry Andric //===----------------------------------------------------------------------===// 281ad6265SDimitry Andric // 381ad6265SDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 481ad6265SDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 581ad6265SDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 681ad6265SDimitry Andric // 781ad6265SDimitry Andric //===----------------------------------------------------------------------===// 881ad6265SDimitry Andric 981ad6265SDimitry Andric #ifndef _LIBCPP___RANDOM_IS_VALID_H 1081ad6265SDimitry Andric #define _LIBCPP___RANDOM_IS_VALID_H 1181ad6265SDimitry Andric 1281ad6265SDimitry Andric #include <__config> 1306c3fb27SDimitry Andric #include <__type_traits/enable_if.h> 1406c3fb27SDimitry Andric #include <__type_traits/integral_constant.h> 1506c3fb27SDimitry Andric #include <__type_traits/is_same.h> 1606c3fb27SDimitry Andric #include <__type_traits/is_unsigned.h> 1706c3fb27SDimitry Andric #include <__utility/declval.h> 18fcaf7f86SDimitry Andric #include <cstdint> 1981ad6265SDimitry Andric 2081ad6265SDimitry Andric #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 2181ad6265SDimitry Andric # pragma GCC system_header 2281ad6265SDimitry Andric #endif 2381ad6265SDimitry Andric 2481ad6265SDimitry Andric _LIBCPP_BEGIN_NAMESPACE_STD 2581ad6265SDimitry Andric 265f757f3fSDimitry Andric // [rand.req.genl]/1.4: 275f757f3fSDimitry Andric // The effect of instantiating a template that has a template type parameter 285f757f3fSDimitry Andric // named RealType is undefined unless the corresponding template argument is 295f757f3fSDimitry Andric // cv-unqualified and is one of float, double, or long double. 305f757f3fSDimitry Andric 315f757f3fSDimitry Andric template <class> 325f757f3fSDimitry Andric struct __libcpp_random_is_valid_realtype : false_type {}; 335f757f3fSDimitry Andric template <> 345f757f3fSDimitry Andric struct __libcpp_random_is_valid_realtype<float> : true_type {}; 355f757f3fSDimitry Andric template <> 365f757f3fSDimitry Andric struct __libcpp_random_is_valid_realtype<double> : true_type {}; 375f757f3fSDimitry Andric template <> 385f757f3fSDimitry Andric struct __libcpp_random_is_valid_realtype<long double> : true_type {}; 395f757f3fSDimitry Andric 4081ad6265SDimitry Andric // [rand.req.genl]/1.5: 4181ad6265SDimitry Andric // The effect of instantiating a template that has a template type parameter 4281ad6265SDimitry Andric // named IntType is undefined unless the corresponding template argument is 4381ad6265SDimitry Andric // cv-unqualified and is one of short, int, long, long long, unsigned short, 4481ad6265SDimitry Andric // unsigned int, unsigned long, or unsigned long long. 4581ad6265SDimitry Andric 46*cb14a3feSDimitry Andric template <class> 47*cb14a3feSDimitry Andric struct __libcpp_random_is_valid_inttype : false_type {}; 48*cb14a3feSDimitry Andric template <> 49*cb14a3feSDimitry Andric struct __libcpp_random_is_valid_inttype<int8_t> : true_type {}; // extension 50*cb14a3feSDimitry Andric template <> 51*cb14a3feSDimitry Andric struct __libcpp_random_is_valid_inttype<short> : true_type {}; 52*cb14a3feSDimitry Andric template <> 53*cb14a3feSDimitry Andric struct __libcpp_random_is_valid_inttype<int> : true_type {}; 54*cb14a3feSDimitry Andric template <> 55*cb14a3feSDimitry Andric struct __libcpp_random_is_valid_inttype<long> : true_type {}; 56*cb14a3feSDimitry Andric template <> 57*cb14a3feSDimitry Andric struct __libcpp_random_is_valid_inttype<long long> : true_type {}; 58*cb14a3feSDimitry Andric template <> 59*cb14a3feSDimitry Andric struct __libcpp_random_is_valid_inttype<uint8_t> : true_type {}; // extension 60*cb14a3feSDimitry Andric template <> 61*cb14a3feSDimitry Andric struct __libcpp_random_is_valid_inttype<unsigned short> : true_type {}; 62*cb14a3feSDimitry Andric template <> 63*cb14a3feSDimitry Andric struct __libcpp_random_is_valid_inttype<unsigned int> : true_type {}; 64*cb14a3feSDimitry Andric template <> 65*cb14a3feSDimitry Andric struct __libcpp_random_is_valid_inttype<unsigned long> : true_type {}; 66*cb14a3feSDimitry Andric template <> 67*cb14a3feSDimitry Andric struct __libcpp_random_is_valid_inttype<unsigned long long> : true_type {}; 6881ad6265SDimitry Andric 6981ad6265SDimitry Andric #ifndef _LIBCPP_HAS_NO_INT128 70*cb14a3feSDimitry Andric template <> 71*cb14a3feSDimitry Andric struct __libcpp_random_is_valid_inttype<__int128_t> : true_type {}; // extension 72*cb14a3feSDimitry Andric template <> 73*cb14a3feSDimitry Andric struct __libcpp_random_is_valid_inttype<__uint128_t> : true_type {}; // extension 7481ad6265SDimitry Andric #endif // _LIBCPP_HAS_NO_INT128 7581ad6265SDimitry Andric 7681ad6265SDimitry Andric // [rand.req.urng]/3: 7781ad6265SDimitry Andric // A class G meets the uniform random bit generator requirements if G models 7881ad6265SDimitry Andric // uniform_random_bit_generator, invoke_result_t<G&> is an unsigned integer type, 7981ad6265SDimitry Andric // and G provides a nested typedef-name result_type that denotes the same type 8081ad6265SDimitry Andric // as invoke_result_t<G&>. 8181ad6265SDimitry Andric // (In particular, reject URNGs with signed result_types; our distributions cannot 8281ad6265SDimitry Andric // handle such generator types.) 8381ad6265SDimitry Andric 84*cb14a3feSDimitry Andric template <class, class = void> 85*cb14a3feSDimitry Andric struct __libcpp_random_is_valid_urng : false_type {}; 86*cb14a3feSDimitry Andric template <class _Gp> 87*cb14a3feSDimitry Andric struct __libcpp_random_is_valid_urng< 88*cb14a3feSDimitry Andric _Gp, 89*cb14a3feSDimitry Andric __enable_if_t< is_unsigned<typename _Gp::result_type>::value && 90*cb14a3feSDimitry Andric _IsSame<decltype(std::declval<_Gp&>()()), typename _Gp::result_type>::value > > : true_type {}; 9181ad6265SDimitry Andric 9281ad6265SDimitry Andric _LIBCPP_END_NAMESPACE_STD 9381ad6265SDimitry Andric 9481ad6265SDimitry Andric #endif // _LIBCPP___RANDOM_IS_VALID_H 95