| //===----------------------------------------------------------------------===// |
| // |
| // 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 |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // <tuple> |
| |
| // constexpr const tuple& operator=(const tuple&) const; |
| // |
| // Constraints: (is_copy_assignable_v<const Types> && ...) is true. |
| |
| // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20 |
| |
| // test constraints |
| |
| #include <cassert> |
| #include <tuple> |
| #include <type_traits> |
| |
| #include "test_macros.h" |
| #include "copy_move_types.h" |
| |
| static_assert(!std::is_assignable_v<const std::tuple<int>&, const std::tuple<int>&>); |
| static_assert(std::is_assignable_v<const std::tuple<int&>&, const std::tuple<int&>&>); |
| static_assert(std::is_assignable_v<const std::tuple<int&, int&>&, const std::tuple<int&, int&>&>); |
| static_assert(!std::is_assignable_v<const std::tuple<int&, int>&, const std::tuple<int&, int>&>); |
| static_assert(std::is_assignable_v<const std::tuple<ConstCopyAssign>&, const std::tuple<ConstCopyAssign>&>); |
| static_assert(!std::is_assignable_v<const std::tuple<CopyAssign>&, const std::tuple<CopyAssign>&>); |
| static_assert(!std::is_assignable_v<const std::tuple<ConstMoveAssign>&, const std::tuple<ConstMoveAssign>&>); |
| static_assert(!std::is_assignable_v<const std::tuple<MoveAssign>&, const std::tuple<MoveAssign>&>); |
| |
| constexpr bool test() { |
| // reference types |
| { |
| int i1 = 1; |
| int i2 = 2; |
| double d1 = 3.0; |
| double d2 = 5.0; |
| const std::tuple<int&, double&> t1{i1, d1}; |
| const std::tuple<int&, double&> t2{i2, d2}; |
| t2 = t1; |
| assert(std::get<0>(t2) == 1); |
| assert(std::get<1>(t2) == 3.0); |
| } |
| |
| // user defined const copy assignment |
| { |
| const std::tuple<ConstCopyAssign> t1{1}; |
| const std::tuple<ConstCopyAssign> t2{2}; |
| t2 = t1; |
| assert(std::get<0>(t2).val == 1); |
| } |
| |
| // make sure the right assignment operator of the type in the tuple is used |
| { |
| std::tuple<TracedAssignment, const TracedAssignment> t1{}; |
| const std::tuple<TracedAssignment, const TracedAssignment> t2{}; |
| t2 = t1; |
| assert(std::get<0>(t2).constCopyAssign == 1); |
| assert(std::get<1>(t2).constCopyAssign == 1); |
| } |
| |
| return true; |
| } |
| |
| int main(int, char**) { |
| test(); |
| |
| // gcc cannot have mutable member in constant expression |
| #if !defined(TEST_COMPILER_GCC) |
| static_assert(test()); |
| #endif |
| return 0; |
| } |