134a848236
Summary: P0602R4 makes the special member functions of optional and variant conditionally trivial based on the types in the optional/variant. We already implemented that, but the tests were organized as if this were a non-standard extension. This patch reorganizes the tests in a way that makes more sense since this is not an extension anymore. Reviewers: EricWF, mpark, mclow.lists Subscribers: christof, jkorous, dexonsmith, libcxx-commits Differential Revision: https://reviews.llvm.org/D54772 git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@350884 91177308-0d34-0410-b5e6-96231b3b80d8
99 lines
4.2 KiB
C++
99 lines
4.2 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++98, c++03, c++11, c++14
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// <optional>
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// This test asserts the triviality of special member functions of optional<T>
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// whenever T has these special member functions trivial. The goal of this test
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// is to make sure that we do not change the triviality of those, since that
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// constitues an ABI break (small enough optionals would be passed by registers).
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//
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// constexpr optional(const optional& rhs);
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// constexpr optional(optional&& rhs) noexcept(see below);
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// constexpr optional<T>& operator=(const optional& rhs);
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// constexpr optional<T>& operator=(optional&& rhs) noexcept(see below);
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#include <optional>
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#include <type_traits>
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#include <cassert>
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#include "archetypes.hpp"
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template <class T>
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struct SpecialMemberTest {
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using O = std::optional<T>;
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static_assert(std::is_trivially_destructible_v<O> ==
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std::is_trivially_destructible_v<T>,
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"optional<T> is trivially destructible if and only if T is.");
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static_assert(std::is_trivially_copy_constructible_v<O> ==
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std::is_trivially_copy_constructible_v<T>,
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"optional<T> is trivially copy constructible if and only if T is.");
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static_assert(std::is_trivially_move_constructible_v<O> ==
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std::is_trivially_move_constructible_v<T> ||
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(!std::is_move_constructible_v<T> && std::is_trivially_copy_constructible_v<T>),
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"optional<T> is trivially move constructible if T is trivially move constructible, "
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"or if T is trivially copy constructible and is not move constructible.");
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static_assert(std::is_trivially_copy_assignable_v<O> ==
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(std::is_trivially_destructible_v<T> &&
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std::is_trivially_copy_constructible_v<T> &&
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std::is_trivially_copy_assignable_v<T>),
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"optional<T> is trivially copy assignable if and only if T is trivially destructible, "
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"trivially copy constructible, and trivially copy assignable.");
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static_assert(std::is_trivially_move_assignable_v<O> ==
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(std::is_trivially_destructible_v<T> &&
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((std::is_trivially_move_constructible_v<T> && std::is_trivially_move_assignable_v<T>) ||
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((!std::is_move_constructible_v<T> || !std::is_move_assignable_v<T>) &&
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std::is_trivially_copy_constructible_v<T> && std::is_trivially_copy_assignable_v<T>))),
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"optional<T> is trivially move assignable if T is trivially destructible, and either "
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"(1) trivially move constructible and trivially move assignable, or "
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"(2) not move constructible or not move assignable, and "
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"trivially copy constructible and trivially copy assignable.");
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};
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template <class ...Args> static void sink(Args&&...) {}
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template <class ...TestTypes>
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struct DoTestsMetafunction {
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DoTestsMetafunction() { sink(SpecialMemberTest<TestTypes>{}...); }
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};
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struct TrivialMoveNonTrivialCopy {
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TrivialMoveNonTrivialCopy() = default;
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TrivialMoveNonTrivialCopy(const TrivialMoveNonTrivialCopy&) {}
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TrivialMoveNonTrivialCopy(TrivialMoveNonTrivialCopy&&) = default;
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TrivialMoveNonTrivialCopy& operator=(const TrivialMoveNonTrivialCopy&) { return *this; }
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TrivialMoveNonTrivialCopy& operator=(TrivialMoveNonTrivialCopy&&) = default;
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};
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struct TrivialCopyNonTrivialMove {
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TrivialCopyNonTrivialMove() = default;
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TrivialCopyNonTrivialMove(const TrivialCopyNonTrivialMove&) = default;
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TrivialCopyNonTrivialMove(TrivialCopyNonTrivialMove&&) {}
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TrivialCopyNonTrivialMove& operator=(const TrivialCopyNonTrivialMove&) = default;
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TrivialCopyNonTrivialMove& operator=(TrivialCopyNonTrivialMove&&) { return *this; }
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};
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int main()
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{
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sink(
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ImplicitTypes::ApplyTypes<DoTestsMetafunction>{},
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ExplicitTypes::ApplyTypes<DoTestsMetafunction>{},
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NonLiteralTypes::ApplyTypes<DoTestsMetafunction>{},
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NonTrivialTypes::ApplyTypes<DoTestsMetafunction>{},
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DoTestsMetafunction<TrivialMoveNonTrivialCopy, TrivialCopyNonTrivialMove>{}
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);
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}
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