101 lines
2.2 KiB
C++
101 lines
2.2 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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// UNSUPPORTED: c++03
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// <utility>
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// template <class T1, class T2> struct pair
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// pair& operator=(pair const& p);
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#include <utility>
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#include <memory>
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#include <cassert>
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#include "test_macros.h"
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#include "archetypes.h"
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struct CountAssign {
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int copied = 0;
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int moved = 0;
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TEST_CONSTEXPR_CXX20 CountAssign() = default;
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TEST_CONSTEXPR_CXX20 CountAssign& operator=(CountAssign const&) {
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++copied;
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return *this;
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}
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TEST_CONSTEXPR_CXX20 CountAssign& operator=(CountAssign&&) {
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++moved;
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return *this;
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}
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};
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struct Incomplete;
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extern Incomplete inc_obj;
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TEST_CONSTEXPR_CXX20 bool test() {
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{
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typedef std::pair<ConstexprTestTypes::CopyOnly, int> P;
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const P p1(ConstexprTestTypes::CopyOnly(), short{4});
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P p2;
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p2 = p1;
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assert(p2.second == 4);
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}
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{
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using P = std::pair<int&, int&&>;
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int x = 42;
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int y = 101;
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int x2 = -1;
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int y2 = 300;
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P p1(x, std::move(y));
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P p2(x2, std::move(y2));
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p1 = p2;
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assert(p1.first == x2);
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assert(p1.second == y2);
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}
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{
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using P = std::pair<int, ConstexprTestTypes::NonCopyable>;
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static_assert(!std::is_copy_assignable<P>::value, "");
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}
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{
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using P = std::pair<CountAssign, ConstexprTestTypes::Copyable>;
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static_assert(std::is_copy_assignable<P>::value, "");
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P p;
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P p2;
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p = p2;
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assert(p.first.copied == 1);
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assert(p.first.moved == 0);
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assert(p2.first.copied == 0);
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assert(p2.first.moved == 0);
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}
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{
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using P = std::pair<int, ConstexprTestTypes::MoveAssignOnly>;
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static_assert(!std::is_copy_assignable<P>::value, "");
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}
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{
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using P = std::pair<int, Incomplete&>;
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static_assert(!std::is_copy_assignable<P>::value, "");
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P p(42, inc_obj);
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assert(&p.second == &inc_obj);
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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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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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return 0;
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}
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struct Incomplete {};
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Incomplete inc_obj;
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