ce7771902d
This patch updates the includes guards of the C++ 03 headers. This is part of https://discourse.llvm.org/t/rfc-freezing-c-03-headers-in-libc.
95 lines
3.7 KiB
C++
95 lines
3.7 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___CXX03___RANDOM_IS_VALID_H
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#define _LIBCPP___CXX03___RANDOM_IS_VALID_H
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#include <__cxx03/__config>
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#include <__cxx03/__type_traits/enable_if.h>
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#include <__cxx03/__type_traits/integral_constant.h>
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#include <__cxx03/__type_traits/is_same.h>
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#include <__cxx03/__type_traits/is_unsigned.h>
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#include <__cxx03/__utility/declval.h>
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#include <__cxx03/cstdint>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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// [rand.req.genl]/1.4:
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// The effect of instantiating a template that has a template type parameter
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// named RealType is undefined unless the corresponding template argument is
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// cv-unqualified and is one of float, double, or long double.
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template <class>
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struct __libcpp_random_is_valid_realtype : false_type {};
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template <>
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struct __libcpp_random_is_valid_realtype<float> : true_type {};
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template <>
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struct __libcpp_random_is_valid_realtype<double> : true_type {};
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template <>
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struct __libcpp_random_is_valid_realtype<long double> : true_type {};
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// [rand.req.genl]/1.5:
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// The effect of instantiating a template that has a template type parameter
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// named IntType is undefined unless the corresponding template argument is
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// cv-unqualified and is one of short, int, long, long long, unsigned short,
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// unsigned int, unsigned long, or unsigned long long.
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template <class>
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struct __libcpp_random_is_valid_inttype : false_type {};
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template <>
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struct __libcpp_random_is_valid_inttype<int8_t> : true_type {}; // extension
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template <>
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struct __libcpp_random_is_valid_inttype<short> : true_type {};
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template <>
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struct __libcpp_random_is_valid_inttype<int> : true_type {};
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template <>
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struct __libcpp_random_is_valid_inttype<long> : true_type {};
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template <>
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struct __libcpp_random_is_valid_inttype<long long> : true_type {};
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template <>
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struct __libcpp_random_is_valid_inttype<uint8_t> : true_type {}; // extension
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template <>
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struct __libcpp_random_is_valid_inttype<unsigned short> : true_type {};
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template <>
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struct __libcpp_random_is_valid_inttype<unsigned int> : true_type {};
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template <>
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struct __libcpp_random_is_valid_inttype<unsigned long> : true_type {};
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template <>
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struct __libcpp_random_is_valid_inttype<unsigned long long> : true_type {};
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#ifndef _LIBCPP_HAS_NO_INT128
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template <>
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struct __libcpp_random_is_valid_inttype<__int128_t> : true_type {}; // extension
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template <>
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struct __libcpp_random_is_valid_inttype<__uint128_t> : true_type {}; // extension
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#endif // _LIBCPP_HAS_NO_INT128
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// [rand.req.urng]/3:
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// A class G meets the uniform random bit generator requirements if G models
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// uniform_random_bit_generator, invoke_result_t<G&> is an unsigned integer type,
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// and G provides a nested typedef-name result_type that denotes the same type
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// as invoke_result_t<G&>.
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// (In particular, reject URNGs with signed result_types; our distributions cannot
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// handle such generator types.)
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template <class, class = void>
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struct __libcpp_random_is_valid_urng : false_type {};
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template <class _Gp>
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struct __libcpp_random_is_valid_urng<
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_Gp,
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__enable_if_t< is_unsigned<typename _Gp::result_type>::value &&
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_IsSame<decltype(std::declval<_Gp&>()()), typename _Gp::result_type>::value > > : true_type {};
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___CXX03___RANDOM_IS_VALID_H
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