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119 lines
2.8 KiB
C++
119 lines
2.8 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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// <utility>
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// template<class T>
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// requires MoveAssignable<T> && MoveConstructible<T>
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// void
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// swap(T& a, T& b);
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#include <utility>
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#include <cassert>
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#include <memory>
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#include "test_macros.h"
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#if TEST_STD_VER >= 11
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struct CopyOnly {
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CopyOnly() {}
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CopyOnly(CopyOnly const&) noexcept {}
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CopyOnly& operator=(CopyOnly const&) { return *this; }
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};
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struct MoveOnly {
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MoveOnly() {}
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MoveOnly(MoveOnly&&) {}
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MoveOnly& operator=(MoveOnly&&) noexcept { return *this; }
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};
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struct NoexceptMoveOnly {
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NoexceptMoveOnly() {}
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NoexceptMoveOnly(NoexceptMoveOnly&&) noexcept {}
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NoexceptMoveOnly& operator=(NoexceptMoveOnly&&) noexcept { return *this; }
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};
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struct NotMoveConstructible {
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NotMoveConstructible& operator=(NotMoveConstructible&&) { return *this; }
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private:
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NotMoveConstructible(NotMoveConstructible&&);
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};
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struct NotMoveAssignable {
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NotMoveAssignable(NotMoveAssignable&&);
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private:
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NotMoveAssignable& operator=(NotMoveAssignable&&);
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};
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template <class Tp>
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auto can_swap_test(int) -> decltype(std::swap(std::declval<Tp>(), std::declval<Tp>()));
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template <class Tp>
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auto can_swap_test(...) -> std::false_type;
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template <class Tp>
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constexpr bool can_swap() {
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return std::is_same<decltype(can_swap_test<Tp>(0)), void>::value;
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}
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#endif
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#if TEST_STD_VER > 17
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constexpr bool test_swap_constexpr()
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{
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int i = 1;
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int j = 2;
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std::swap(i, j);
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return i == 2 && j == 1;
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}
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#endif // TEST_STD_VER > 17
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int main(int, char**)
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{
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{
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int i = 1;
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int j = 2;
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std::swap(i, j);
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assert(i == 2);
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assert(j == 1);
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}
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#if TEST_STD_VER >= 11
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{
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std::unique_ptr<int> i(new int(1));
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std::unique_ptr<int> j(new int(2));
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std::swap(i, j);
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assert(*i == 2);
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assert(*j == 1);
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}
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{
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// test that the swap
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static_assert(can_swap<CopyOnly&>(), "");
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static_assert(can_swap<MoveOnly&>(), "");
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static_assert(can_swap<NoexceptMoveOnly&>(), "");
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static_assert(!can_swap<NotMoveConstructible&>(), "");
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static_assert(!can_swap<NotMoveAssignable&>(), "");
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CopyOnly c;
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MoveOnly m;
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NoexceptMoveOnly nm;
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static_assert(!noexcept(std::swap(c, c)), "");
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static_assert(!noexcept(std::swap(m, m)), "");
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static_assert(noexcept(std::swap(nm, nm)), "");
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}
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#endif
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#if TEST_STD_VER > 17
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static_assert(test_swap_constexpr());
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#endif // TEST_STD_VER > 17
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return 0;
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}
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