| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef _LIBCPP___RANDOM_IS_VALID_H |
| #define _LIBCPP___RANDOM_IS_VALID_H |
| |
| #include <__config> |
| #include <cstdint> |
| #include <type_traits> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| # pragma GCC system_header |
| #endif |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| // [rand.req.genl]/1.5: |
| // The effect of instantiating a template that has a template type parameter |
| // named IntType is undefined unless the corresponding template argument is |
| // cv-unqualified and is one of short, int, long, long long, unsigned short, |
| // unsigned int, unsigned long, or unsigned long long. |
| |
| template<class> struct __libcpp_random_is_valid_inttype : false_type {}; |
| template<> struct __libcpp_random_is_valid_inttype<int8_t> : true_type {}; // extension |
| template<> struct __libcpp_random_is_valid_inttype<short> : true_type {}; |
| template<> struct __libcpp_random_is_valid_inttype<int> : true_type {}; |
| template<> struct __libcpp_random_is_valid_inttype<long> : true_type {}; |
| template<> struct __libcpp_random_is_valid_inttype<long long> : true_type {}; |
| template<> struct __libcpp_random_is_valid_inttype<uint8_t> : true_type {}; // extension |
| template<> struct __libcpp_random_is_valid_inttype<unsigned short> : true_type {}; |
| template<> struct __libcpp_random_is_valid_inttype<unsigned int> : true_type {}; |
| template<> struct __libcpp_random_is_valid_inttype<unsigned long> : true_type {}; |
| template<> struct __libcpp_random_is_valid_inttype<unsigned long long> : true_type {}; |
| |
| #ifndef _LIBCPP_HAS_NO_INT128 |
| template<> struct __libcpp_random_is_valid_inttype<__int128_t> : true_type {}; // extension |
| template<> struct __libcpp_random_is_valid_inttype<__uint128_t> : true_type {}; // extension |
| #endif // _LIBCPP_HAS_NO_INT128 |
| |
| // [rand.req.urng]/3: |
| // A class G meets the uniform random bit generator requirements if G models |
| // uniform_random_bit_generator, invoke_result_t<G&> is an unsigned integer type, |
| // and G provides a nested typedef-name result_type that denotes the same type |
| // as invoke_result_t<G&>. |
| // (In particular, reject URNGs with signed result_types; our distributions cannot |
| // handle such generator types.) |
| |
| template<class, class = void> struct __libcpp_random_is_valid_urng : false_type {}; |
| template<class _Gp> struct __libcpp_random_is_valid_urng<_Gp, __enable_if_t< |
| is_unsigned<typename _Gp::result_type>::value && |
| _IsSame<decltype(std::declval<_Gp&>()()), typename _Gp::result_type>::value |
| > > : true_type {}; |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // _LIBCPP___RANDOM_IS_VALID_H |