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103 lines
2.5 KiB
C++
103 lines
2.5 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<ValueType T, size_t N>
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// requires Swappable<T>
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// void
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// swap(T (&a)[N], T (&b)[N]);
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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 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() {}
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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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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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int main(int, char**)
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{
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{
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int i[3] = {1, 2, 3};
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int j[3] = {4, 5, 6};
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std::swap(i, j);
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assert(i[0] == 4);
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assert(i[1] == 5);
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assert(i[2] == 6);
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assert(j[0] == 1);
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assert(j[1] == 2);
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assert(j[2] == 3);
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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[3];
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for (int k = 0; k < 3; ++k)
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i[k].reset(new int(k+1));
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std::unique_ptr<int> j[3];
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for (int k = 0; k < 3; ++k)
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j[k].reset(new int(k+4));
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std::swap(i, j);
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assert(*i[0] == 4);
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assert(*i[1] == 5);
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assert(*i[2] == 6);
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assert(*j[0] == 1);
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assert(*j[1] == 2);
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assert(*j[2] == 3);
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}
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{
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using CA = CopyOnly[42];
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using MA = NoexceptMoveOnly[42];
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using NA = NotMoveConstructible[42];
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static_assert(can_swap<CA&>(), "");
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static_assert(can_swap<MA&>(), "");
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static_assert(!can_swap<NA&>(), "");
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CA ca;
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MA ma;
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static_assert(!noexcept(std::swap(ca, ca)), "");
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static_assert(noexcept(std::swap(ma, ma)), "");
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}
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#endif
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return 0;
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}
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