forked from OSchip/llvm-project
[libcxx] adds [concepts.arithmetic]
Implements parts of:
* P0898R3 Standard Library Concepts
* P1754 Rename concepts to standard_case for C++20, while we still can
Differential Revision: https://reviews.llvm.org/D88131
This commit is contained in:
Christopher Di Bella
parent
68945a8686
commit
bee7b07f23
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@ -165,6 +165,19 @@ concept convertible_to =
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static_cast<_To>(__f());
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};
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// [concepts.arithmetic], arithmetic concepts
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template<class _Tp>
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concept integral = is_integral_v<_Tp>;
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template<class _Tp>
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concept signed_integral = integral<_Tp> && is_signed_v<_Tp>;
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template<class _Tp>
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concept unsigned_integral = integral<_Tp> && !signed_integral<_Tp>;
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template<class _Tp>
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concept floating_point = is_floating_point_v<_Tp>;
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// [concept.destructible]
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template<class _Tp>
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@ -0,0 +1,346 @@
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//===----------------------------------------------------------------------===//
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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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// UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
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// UNSUPPORTED: libcpp-no-concepts
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// template<class T>
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// concept integral = // see below
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// template<class T>
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// concept signed_integral = // see below
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// template<class T>
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// concept unsigned_integral = // see below
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// template<class T>
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// concept floating_point = // see below
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#include <concepts>
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#include <type_traits>
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namespace {
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template <typename T>
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constexpr bool CheckIntegralQualifiers() {
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constexpr bool result = std::integral<T>;
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static_assert(std::integral<const T> == result);
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static_assert(std::integral<volatile T> == result);
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static_assert(std::integral<const volatile T> == result);
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static_assert(!std::integral<T&>);
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static_assert(!std::integral<const T&>);
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static_assert(!std::integral<volatile T&>);
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static_assert(!std::integral<const volatile T&>);
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static_assert(!std::integral<T&&>);
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static_assert(!std::integral<const T&&>);
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static_assert(!std::integral<volatile T&&>);
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static_assert(!std::integral<const volatile T&&>);
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static_assert(!std::integral<T*>);
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static_assert(!std::integral<const T*>);
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static_assert(!std::integral<volatile T*>);
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static_assert(!std::integral<const volatile T*>);
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static_assert(!std::integral<T (*)()>);
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static_assert(!std::integral<T (&)()>);
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static_assert(!std::integral<T(&&)()>);
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return result;
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}
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enum ClassicEnum { a, b, c };
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enum class ScopedEnum { x, y, z };
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struct EmptyStruct {};
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constexpr void CheckIntegral() {
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// standard signed and unsigned integers
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static_assert(CheckIntegralQualifiers<signed char>());
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static_assert(CheckIntegralQualifiers<unsigned char>());
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static_assert(CheckIntegralQualifiers<short>());
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static_assert(CheckIntegralQualifiers<unsigned short>());
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static_assert(CheckIntegralQualifiers<int>());
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static_assert(CheckIntegralQualifiers<unsigned int>());
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static_assert(CheckIntegralQualifiers<long>());
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static_assert(CheckIntegralQualifiers<unsigned long>());
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static_assert(CheckIntegralQualifiers<long long>());
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static_assert(CheckIntegralQualifiers<unsigned long long>());
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// extended integers
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#ifndef _LIBCPP_HAS_NO_INT128
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static_assert(CheckIntegralQualifiers<__int128_t>());
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static_assert(CheckIntegralQualifiers<__uint128_t>());
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#endif
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// bool and char types are also integral
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static_assert(CheckIntegralQualifiers<wchar_t>());
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static_assert(CheckIntegralQualifiers<bool>());
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static_assert(CheckIntegralQualifiers<char>());
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static_assert(CheckIntegralQualifiers<char8_t>());
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static_assert(CheckIntegralQualifiers<char16_t>());
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static_assert(CheckIntegralQualifiers<char32_t>());
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// types that aren't integral
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static_assert(!std::integral<void>);
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static_assert(!CheckIntegralQualifiers<float>());
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static_assert(!CheckIntegralQualifiers<double>());
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static_assert(!CheckIntegralQualifiers<long double>());
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static_assert(!CheckIntegralQualifiers<ClassicEnum>());
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static_assert(!CheckIntegralQualifiers<ScopedEnum>());
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static_assert(!CheckIntegralQualifiers<EmptyStruct>());
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static_assert(!CheckIntegralQualifiers<int EmptyStruct::*>());
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static_assert(!CheckIntegralQualifiers<int (EmptyStruct::*)()>());
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}
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template <typename T>
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constexpr bool CheckSignedIntegralQualifiers() {
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constexpr bool result = std::signed_integral<T>;
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static_assert(std::signed_integral<const T> == result);
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static_assert(std::signed_integral<volatile T> == result);
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static_assert(std::signed_integral<const volatile T> == result);
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static_assert(!std::signed_integral<T&>);
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static_assert(!std::signed_integral<const T&>);
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static_assert(!std::signed_integral<volatile T&>);
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static_assert(!std::signed_integral<const volatile T&>);
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static_assert(!std::signed_integral<T&&>);
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static_assert(!std::signed_integral<const T&&>);
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static_assert(!std::signed_integral<volatile T&&>);
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static_assert(!std::signed_integral<const volatile T&&>);
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static_assert(!std::signed_integral<T*>);
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static_assert(!std::signed_integral<const T*>);
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static_assert(!std::signed_integral<volatile T*>);
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static_assert(!std::signed_integral<const volatile T*>);
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static_assert(!std::signed_integral<T (*)()>);
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static_assert(!std::signed_integral<T (&)()>);
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static_assert(!std::signed_integral<T(&&)()>);
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return result;
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}
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constexpr void CheckSignedIntegral() {
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// standard signed integers
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static_assert(CheckSignedIntegralQualifiers<signed char>());
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static_assert(CheckSignedIntegralQualifiers<short>());
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static_assert(CheckSignedIntegralQualifiers<int>());
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static_assert(CheckSignedIntegralQualifiers<long>());
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static_assert(CheckSignedIntegralQualifiers<long long>());
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// bool and character *may* be signed
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static_assert(CheckSignedIntegralQualifiers<wchar_t>() ==
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std::is_signed_v<wchar_t>);
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static_assert(CheckSignedIntegralQualifiers<bool>() ==
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std::is_signed_v<bool>);
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static_assert(CheckSignedIntegralQualifiers<char>() ==
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std::is_signed_v<char>);
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static_assert(CheckSignedIntegralQualifiers<char8_t>() ==
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std::is_signed_v<char8_t>);
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static_assert(CheckSignedIntegralQualifiers<char16_t>() ==
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std::is_signed_v<char16_t>);
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static_assert(CheckSignedIntegralQualifiers<char32_t>() ==
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std::is_signed_v<char32_t>);
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// integers that aren't signed integrals
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static_assert(!CheckSignedIntegralQualifiers<unsigned char>());
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static_assert(!CheckSignedIntegralQualifiers<unsigned short>());
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static_assert(!CheckSignedIntegralQualifiers<unsigned int>());
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static_assert(!CheckSignedIntegralQualifiers<unsigned long>());
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static_assert(!CheckSignedIntegralQualifiers<unsigned long long>());
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// extended integers
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#ifndef _LIBCPP_HAS_NO_INT128
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static_assert(CheckSignedIntegralQualifiers<__int128_t>());
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static_assert(!CheckSignedIntegralQualifiers<__uint128_t>());
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#endif
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// types that aren't even integers shouldn't be signed integers!
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static_assert(!std::signed_integral<void>);
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static_assert(!CheckSignedIntegralQualifiers<float>());
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static_assert(!CheckSignedIntegralQualifiers<double>());
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static_assert(!CheckSignedIntegralQualifiers<long double>());
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static_assert(!CheckSignedIntegralQualifiers<ClassicEnum>());
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static_assert(!CheckSignedIntegralQualifiers<ScopedEnum>());
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static_assert(!CheckSignedIntegralQualifiers<EmptyStruct>());
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static_assert(!CheckSignedIntegralQualifiers<int EmptyStruct::*>());
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static_assert(!CheckSignedIntegralQualifiers<int (EmptyStruct::*)()>());
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}
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template <typename T>
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constexpr bool CheckUnsignedIntegralQualifiers() {
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constexpr bool result = std::unsigned_integral<T>;
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static_assert(std::unsigned_integral<const T> == result);
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static_assert(std::unsigned_integral<volatile T> == result);
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static_assert(std::unsigned_integral<const volatile T> == result);
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static_assert(!std::unsigned_integral<T&>);
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static_assert(!std::unsigned_integral<const T&>);
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static_assert(!std::unsigned_integral<volatile T&>);
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static_assert(!std::unsigned_integral<const volatile T&>);
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static_assert(!std::unsigned_integral<T&&>);
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static_assert(!std::unsigned_integral<const T&&>);
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static_assert(!std::unsigned_integral<volatile T&&>);
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static_assert(!std::unsigned_integral<const volatile T&&>);
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static_assert(!std::unsigned_integral<T*>);
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static_assert(!std::unsigned_integral<const T*>);
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static_assert(!std::unsigned_integral<volatile T*>);
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static_assert(!std::unsigned_integral<const volatile T*>);
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static_assert(!std::unsigned_integral<T (*)()>);
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static_assert(!std::unsigned_integral<T (&)()>);
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static_assert(!std::unsigned_integral<T(&&)()>);
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return result;
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}
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constexpr void CheckUnsignedIntegral() {
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// standard unsigned types
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static_assert(CheckUnsignedIntegralQualifiers<unsigned char>());
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static_assert(CheckUnsignedIntegralQualifiers<unsigned short>());
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static_assert(CheckUnsignedIntegralQualifiers<unsigned int>());
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static_assert(CheckUnsignedIntegralQualifiers<unsigned long>());
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static_assert(CheckUnsignedIntegralQualifiers<unsigned long long>());
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// Whether bool and character types are signed or unsigned is impl-defined
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static_assert(CheckUnsignedIntegralQualifiers<wchar_t>() ==
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!std::is_signed_v<wchar_t>);
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static_assert(CheckUnsignedIntegralQualifiers<bool>() ==
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!std::is_signed_v<bool>);
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static_assert(CheckUnsignedIntegralQualifiers<char>() ==
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!std::is_signed_v<char>);
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static_assert(CheckUnsignedIntegralQualifiers<char8_t>() ==
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!std::is_signed_v<char8_t>);
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static_assert(CheckUnsignedIntegralQualifiers<char16_t>() ==
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!std::is_signed_v<char16_t>);
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static_assert(CheckUnsignedIntegralQualifiers<char32_t>() ==
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!std::is_signed_v<char32_t>);
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// extended integers
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#ifndef _LIBCPP_HAS_NO_INT128
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static_assert(CheckUnsignedIntegralQualifiers<__uint128_t>());
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static_assert(!CheckUnsignedIntegralQualifiers<__int128_t>());
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#endif
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// integer types that aren't unsigned integrals
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static_assert(!CheckUnsignedIntegralQualifiers<signed char>());
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static_assert(!CheckUnsignedIntegralQualifiers<short>());
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static_assert(!CheckUnsignedIntegralQualifiers<int>());
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static_assert(!CheckUnsignedIntegralQualifiers<long>());
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static_assert(!CheckUnsignedIntegralQualifiers<long long>());
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static_assert(!std::unsigned_integral<void>);
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static_assert(!CheckUnsignedIntegralQualifiers<float>());
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static_assert(!CheckUnsignedIntegralQualifiers<double>());
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static_assert(!CheckUnsignedIntegralQualifiers<long double>());
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static_assert(!CheckUnsignedIntegralQualifiers<ClassicEnum>());
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static_assert(!CheckUnsignedIntegralQualifiers<ScopedEnum>());
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static_assert(!CheckUnsignedIntegralQualifiers<EmptyStruct>());
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static_assert(!CheckUnsignedIntegralQualifiers<int EmptyStruct::*>());
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static_assert(!CheckUnsignedIntegralQualifiers<int (EmptyStruct::*)()>());
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}
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// This overload should never be called. It exists solely to force subsumption.
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template <std::integral I>
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[[nodiscard]] constexpr bool CheckSubsumption(I) {
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return false;
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}
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// clang-format off
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template <std::integral I>
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requires std::signed_integral<I> && (!std::unsigned_integral<I>)
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[[nodiscard]] constexpr bool CheckSubsumption(I) {
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return std::is_signed_v<I>;
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}
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template <std::integral I>
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requires std::unsigned_integral<I> && (!std::signed_integral<I>)
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[[nodiscard]] constexpr bool CheckSubsumption(I) {
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return std::is_unsigned_v<I>;
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}
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// clang-format on
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template <typename T>
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constexpr bool CheckFloatingPointQualifiers() {
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constexpr bool result = std::floating_point<T>;
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static_assert(std::floating_point<const T> == result);
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static_assert(std::floating_point<volatile T> == result);
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static_assert(std::floating_point<const volatile T> == result);
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static_assert(!std::floating_point<T&>);
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static_assert(!std::floating_point<const T&>);
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static_assert(!std::floating_point<volatile T&>);
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static_assert(!std::floating_point<const volatile T&>);
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static_assert(!std::floating_point<T&&>);
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static_assert(!std::floating_point<const T&&>);
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static_assert(!std::floating_point<volatile T&&>);
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static_assert(!std::floating_point<const volatile T&&>);
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static_assert(!std::floating_point<T*>);
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static_assert(!std::floating_point<const T*>);
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static_assert(!std::floating_point<volatile T*>);
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static_assert(!std::floating_point<const volatile T*>);
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static_assert(!std::floating_point<T (*)()>);
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static_assert(!std::floating_point<T (&)()>);
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static_assert(!std::floating_point<T(&&)()>);
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return result;
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}
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constexpr void CheckFloatingPoint() {
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// floating-point types
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static_assert(CheckFloatingPointQualifiers<float>());
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static_assert(CheckFloatingPointQualifiers<double>());
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static_assert(CheckFloatingPointQualifiers<long double>());
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// types that aren't floating-point
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static_assert(!CheckFloatingPointQualifiers<signed char>());
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static_assert(!CheckFloatingPointQualifiers<unsigned char>());
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static_assert(!CheckFloatingPointQualifiers<short>());
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static_assert(!CheckFloatingPointQualifiers<unsigned short>());
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static_assert(!CheckFloatingPointQualifiers<int>());
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static_assert(!CheckFloatingPointQualifiers<unsigned int>());
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static_assert(!CheckFloatingPointQualifiers<long>());
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static_assert(!CheckFloatingPointQualifiers<unsigned long>());
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static_assert(!CheckFloatingPointQualifiers<long long>());
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static_assert(!CheckFloatingPointQualifiers<unsigned long long>());
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static_assert(!CheckFloatingPointQualifiers<wchar_t>());
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static_assert(!CheckFloatingPointQualifiers<bool>());
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static_assert(!CheckFloatingPointQualifiers<char>());
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static_assert(!CheckFloatingPointQualifiers<char8_t>());
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static_assert(!CheckFloatingPointQualifiers<char16_t>());
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static_assert(!CheckFloatingPointQualifiers<char32_t>());
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static_assert(!std::floating_point<void>);
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static_assert(!CheckFloatingPointQualifiers<ClassicEnum>());
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static_assert(!CheckFloatingPointQualifiers<ScopedEnum>());
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static_assert(!CheckFloatingPointQualifiers<EmptyStruct>());
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static_assert(!CheckFloatingPointQualifiers<int EmptyStruct::*>());
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static_assert(!CheckFloatingPointQualifiers<int (EmptyStruct::*)()>());
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}
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} // namespace
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int main(int, char**) {
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CheckIntegral();
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CheckSignedIntegral();
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CheckUnsignedIntegral();
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static_assert(CheckSubsumption(0));
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static_assert(CheckSubsumption(0U));
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CheckFloatingPoint();
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return 0;
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}
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@ -6,7 +6,7 @@
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
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// UNSUPPORTED: c++03, c++11, c++14, c++17
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// UNSUPPORTED: libcpp-no-concepts
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// template<class T>
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@ -6,7 +6,7 @@
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
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// UNSUPPORTED: c++03, c++11, c++14, c++17
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// UNSUPPORTED: libcpp-no-concepts
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// template<class T>
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