95733a55b9
1. for constructors that takes cvref variation of tuple<UTypes...>, there used to be two SFINAE helper _EnableCopyFromOtherTuple, _EnableMoveFromOtherTuple. And the implementations of these two helpers seem to slightly differ from the spec. But now, we need 4 variations. Instead of adding another two, this change refactored it to a single one _EnableCtrFromUTypesTuple, which directly maps to the spec without changing the C++11 behaviour. However, we need the helper __copy_cvref_t to get the type of std::get<i>(cvref tuple<Utypes...>) for different cvref, so I made __copy_cvref_t to be available in C++11. 2. for constructors that takes variations of std::pair, there used to be four helpers _EnableExplicitCopyFromPair, _EnableImplicitCopyFromPair, _EnableImplicitMoveFromPair, _EnableExplicitMoveFromPair. Instead of adding another four, this change refactored into two helper _EnableCtrFromPair and _BothImplicitlyConvertible. This also removes the need to use _nat 3. for const member assignment operator, since the requirement is very simple, I haven't refactored the old code but instead directly adding the new c++23 code. 4. for const swap, I pretty much copy pasted the non-const version to make these overloads look consistent 5. while doing these change, I found two of the old constructors wasn't marked constexpr for C++20 but they should. fixed them and added unit tests Reviewed By: #libc, ldionne Differential Revision: https://reviews.llvm.org/D116621
80 lines
2.5 KiB
C++
80 lines
2.5 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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// <tuple>
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// constexpr const tuple& operator=(tuple&&) const;
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//
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// Constraints: (is_assignable_v<const Types&, Types> && ...) is true.
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// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
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// test constraints
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#include <cassert>
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#include <tuple>
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#include <type_traits>
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#include "test_macros.h"
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#include "types.h"
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static_assert(!std::is_assignable_v<const std::tuple<int>&, std::tuple<int>&&>);
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static_assert(std::is_assignable_v<const std::tuple<int&>&, std::tuple<int&>&&>);
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static_assert(std::is_assignable_v<const std::tuple<int&, int&>&, std::tuple<int&, int&>&&>);
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static_assert(!std::is_assignable_v<const std::tuple<int&, int>&, std::tuple<int&, int>&&>);
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// this is fallback to tuple's const copy assignment
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static_assert(std::is_assignable_v<const std::tuple<ConstCopyAssign>&, std::tuple<ConstCopyAssign>&&>);
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static_assert(!std::is_assignable_v<const std::tuple<CopyAssign>&, std::tuple<CopyAssign>&&>);
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static_assert(std::is_assignable_v<const std::tuple<ConstMoveAssign>&, std::tuple<ConstMoveAssign>&&>);
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static_assert(!std::is_assignable_v<const std::tuple<MoveAssign>&, std::tuple<MoveAssign>&&>);
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constexpr bool test() {
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// reference types
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{
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int i1 = 1;
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int i2 = 2;
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double d1 = 3.0;
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double d2 = 5.0;
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std::tuple<int&, double&> t1{i1, d1};
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const std::tuple<int&, double&> t2{i2, d2};
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t2 = std::move(t1);
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assert(std::get<0>(t2) == 1);
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assert(std::get<1>(t2) == 3.0);
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}
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// user defined const move assignment
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{
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std::tuple<ConstMoveAssign> t1{1};
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const std::tuple<ConstMoveAssign> t2{2};
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t2 = std::move(t1);
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assert(std::get<0>(t2).val == 1);
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}
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// make sure the right assignment operator of the type in the tuple is used
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{
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std::tuple<TracedAssignment, const TracedAssignment> t1{};
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const std::tuple<TracedAssignment, const TracedAssignment> t2{};
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t2 = std::move(t1);
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assert(std::get<0>(t2).constMoveAssign == 1);
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assert(std::get<1>(t2).constCopyAssign == 1);
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}
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return true;
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}
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int main() {
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test();
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// gcc cannot have mutable member in constant expression
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#if !defined(TEST_COMPILER_GCC)
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static_assert(test());
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#endif
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return 0;
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}
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