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