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> 13*06c3fb27SDimitry Andric #include <__type_traits/enable_if.h> 14*06c3fb27SDimitry Andric #include <__type_traits/integral_constant.h> 15*06c3fb27SDimitry Andric #include <__type_traits/is_same.h> 16*06c3fb27SDimitry Andric #include <__type_traits/is_unsigned.h> 17*06c3fb27SDimitry 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 2681ad6265SDimitry Andric // [rand.req.genl]/1.5: 2781ad6265SDimitry Andric // The effect of instantiating a template that has a template type parameter 2881ad6265SDimitry Andric // named IntType is undefined unless the corresponding template argument is 2981ad6265SDimitry Andric // cv-unqualified and is one of short, int, long, long long, unsigned short, 3081ad6265SDimitry Andric // unsigned int, unsigned long, or unsigned long long. 3181ad6265SDimitry Andric 3281ad6265SDimitry Andric template<class> struct __libcpp_random_is_valid_inttype : false_type {}; 33fcaf7f86SDimitry Andric template<> struct __libcpp_random_is_valid_inttype<int8_t> : true_type {}; // extension 3481ad6265SDimitry Andric template<> struct __libcpp_random_is_valid_inttype<short> : true_type {}; 3581ad6265SDimitry Andric template<> struct __libcpp_random_is_valid_inttype<int> : true_type {}; 3681ad6265SDimitry Andric template<> struct __libcpp_random_is_valid_inttype<long> : true_type {}; 3781ad6265SDimitry Andric template<> struct __libcpp_random_is_valid_inttype<long long> : true_type {}; 38fcaf7f86SDimitry Andric template<> struct __libcpp_random_is_valid_inttype<uint8_t> : true_type {}; // extension 3981ad6265SDimitry Andric template<> struct __libcpp_random_is_valid_inttype<unsigned short> : true_type {}; 4081ad6265SDimitry Andric template<> struct __libcpp_random_is_valid_inttype<unsigned int> : true_type {}; 4181ad6265SDimitry Andric template<> struct __libcpp_random_is_valid_inttype<unsigned long> : true_type {}; 4281ad6265SDimitry Andric template<> struct __libcpp_random_is_valid_inttype<unsigned long long> : true_type {}; 4381ad6265SDimitry Andric 4481ad6265SDimitry Andric #ifndef _LIBCPP_HAS_NO_INT128 45fcaf7f86SDimitry Andric template<> struct __libcpp_random_is_valid_inttype<__int128_t> : true_type {}; // extension 46fcaf7f86SDimitry Andric template<> struct __libcpp_random_is_valid_inttype<__uint128_t> : true_type {}; // extension 4781ad6265SDimitry Andric #endif // _LIBCPP_HAS_NO_INT128 4881ad6265SDimitry Andric 4981ad6265SDimitry Andric // [rand.req.urng]/3: 5081ad6265SDimitry Andric // A class G meets the uniform random bit generator requirements if G models 5181ad6265SDimitry Andric // uniform_random_bit_generator, invoke_result_t<G&> is an unsigned integer type, 5281ad6265SDimitry Andric // and G provides a nested typedef-name result_type that denotes the same type 5381ad6265SDimitry Andric // as invoke_result_t<G&>. 5481ad6265SDimitry Andric // (In particular, reject URNGs with signed result_types; our distributions cannot 5581ad6265SDimitry Andric // handle such generator types.) 5681ad6265SDimitry Andric 5781ad6265SDimitry Andric template<class, class = void> struct __libcpp_random_is_valid_urng : false_type {}; 5881ad6265SDimitry Andric template<class _Gp> struct __libcpp_random_is_valid_urng<_Gp, __enable_if_t< 5981ad6265SDimitry Andric is_unsigned<typename _Gp::result_type>::value && 60bdd1243dSDimitry Andric _IsSame<decltype(std::declval<_Gp&>()()), typename _Gp::result_type>::value 6181ad6265SDimitry Andric > > : true_type {}; 6281ad6265SDimitry Andric 6381ad6265SDimitry Andric _LIBCPP_END_NAMESPACE_STD 6481ad6265SDimitry Andric 6581ad6265SDimitry Andric #endif // _LIBCPP___RANDOM_IS_VALID_H 66