| //===----------------------------------------------------------------------===// |
| // |
| // 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> |
| |
| // template <class... Types> class tuple; |
| |
| // template <class U1, class U2> |
| // tuple& operator=(const pair<U1, U2>& u); |
| |
| // UNSUPPORTED: c++03 |
| |
| #include <cassert> |
| #include <memory> |
| #include <tuple> |
| #include <type_traits> |
| #include <utility> |
| |
| struct NothrowCopyAssignable { |
| NothrowCopyAssignable& operator=(NothrowCopyAssignable const&) noexcept { return *this; } |
| }; |
| struct PotentiallyThrowingCopyAssignable { |
| PotentiallyThrowingCopyAssignable& operator=(PotentiallyThrowingCopyAssignable const&) { return *this; } |
| }; |
| |
| #include "test_macros.h" |
| |
| TEST_CONSTEXPR_CXX20 |
| bool test() |
| { |
| { |
| typedef std::pair<long, char> T0; |
| typedef std::tuple<long long, short> T1; |
| T0 t0(2, 'a'); |
| T1 t1; |
| t1 = t0; |
| assert(std::get<0>(t1) == 2); |
| assert(std::get<1>(t1) == short('a')); |
| } |
| return true; |
| } |
| |
| int main(int, char**) |
| { |
| test(); |
| #if TEST_STD_VER >= 20 |
| static_assert(test()); |
| #endif |
| |
| { |
| // test that the implicitly generated copy assignment operator |
| // is properly deleted |
| using T = std::tuple<int, int>; |
| using P = std::tuple<std::unique_ptr<int>, std::unique_ptr<int>>; |
| static_assert(!std::is_assignable<T&, const P &>::value, ""); |
| } |
| { |
| typedef std::tuple<NothrowCopyAssignable, long> Tuple; |
| typedef std::pair<NothrowCopyAssignable, int> Pair; |
| static_assert(std::is_nothrow_assignable<Tuple&, Pair const&>::value, ""); |
| static_assert(std::is_nothrow_assignable<Tuple&, Pair&>::value, ""); |
| static_assert(std::is_nothrow_assignable<Tuple&, Pair const&&>::value, ""); |
| } |
| { |
| typedef std::tuple<PotentiallyThrowingCopyAssignable, long> Tuple; |
| typedef std::pair<PotentiallyThrowingCopyAssignable, int> Pair; |
| static_assert(std::is_assignable<Tuple&, Pair const&>::value, ""); |
| static_assert(!std::is_nothrow_assignable<Tuple&, Pair const&>::value, ""); |
| |
| static_assert(std::is_assignable<Tuple&, Pair&>::value, ""); |
| static_assert(!std::is_nothrow_assignable<Tuple&, Pair&>::value, ""); |
| |
| static_assert(std::is_assignable<Tuple&, Pair const&&>::value, ""); |
| static_assert(!std::is_nothrow_assignable<Tuple&, Pair const&&>::value, ""); |
| } |
| |
| return 0; |
| } |