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//===----------------------------------------------------------------------===//
// 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
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
// Older Clangs do not support the C++20 feature to constrain destructors
// XFAIL: clang-14, clang-15, apple-clang-14
// friend constexpr void swap(expected& x, expected& y) noexcept(noexcept(swap(x,y)));
#include <cassert>
#include <expected>
#include <type_traits>
#include <utility>
#include "../../types.h"
#include "test_macros.h"
// Test constraint
static_assert(std::is_swappable_v<std::expected<void, int>>);
struct NotSwappable {
NotSwappable& operator=(const NotSwappable&) = delete;
};
void swap(NotSwappable&, NotSwappable&) = delete;
// !is_swappable_v<E>
static_assert(!std::is_swappable_v<std::expected<void, NotSwappable>>);
struct NotMoveContructible {
NotMoveContructible(NotMoveContructible&&) = delete;
friend void swap(NotMoveContructible&, NotMoveContructible&) {}
};
// !is_move_constructible_v<E>
static_assert(!std::is_swappable_v<std::expected<void, NotMoveContructible>>);
// Test noexcept
struct MoveMayThrow {
MoveMayThrow(MoveMayThrow&&) noexcept(false);
friend void swap(MoveMayThrow&, MoveMayThrow&) noexcept {}
};
template <class E>
concept FreeSwapNoexcept =
requires(std::expected<void, E> x, std::expected<void, E> y) {
{ swap(x, y) } noexcept;
};
static_assert(FreeSwapNoexcept<int>);
// !is_nothrow_move_constructible_v<E>
static_assert(!FreeSwapNoexcept<MoveMayThrow>);
struct SwapMayThrow {
friend void swap(SwapMayThrow&, SwapMayThrow&) noexcept(false) {}
};
// !is_nothrow_swappable_v<E>
static_assert(!FreeSwapNoexcept<SwapMayThrow>);
constexpr bool test() {
// this->has_value() && rhs.has_value()
{
std::expected<void, int> x;
std::expected<void, int> y;
swap(x, y);
assert(x.has_value());
assert(y.has_value());
}
// !this->has_value() && !rhs.has_value()
{
std::expected<void, ADLSwap> x(std::unexpect, 5);
std::expected<void, ADLSwap> y(std::unexpect, 10);
swap(x, y);
assert(!x.has_value());
assert(x.error().i == 10);
assert(x.error().adlSwapCalled);
assert(!y.has_value());
assert(y.error().i == 5);
assert(y.error().adlSwapCalled);
}
// this->has_value() && !rhs.has_value()
{
Traced::state s{};
std::expected<void, Traced> e1(std::in_place);
std::expected<void, Traced> e2(std::unexpect, s, 10);
e1.swap(e2);
assert(!e1.has_value());
assert(e1.error().data_ == 10);
assert(e2.has_value());
assert(s.moveCtorCalled);
assert(s.dtorCalled);
}
// !this->has_value() && rhs.has_value()
{
Traced::state s{};
std::expected<void, Traced> e1(std::unexpect, s, 10);
std::expected<void, Traced> e2(std::in_place);
e1.swap(e2);
assert(e1.has_value());
assert(!e2.has_value());
assert(e2.error().data_ == 10);
assert(s.moveCtorCalled);
assert(s.dtorCalled);
}
return true;
}
void testException() {
#ifndef TEST_HAS_NO_EXCEPTIONS
// !e1.has_value() && e2.has_value()
{
bool e1Destroyed = false;
std::expected<void, ThrowOnMove> e1(std::unexpect, e1Destroyed);
std::expected<void, ThrowOnMove> e2(std::in_place);
try {
swap(e1, e2);
assert(false);
} catch (Except) {
assert(!e1.has_value());
assert(e2.has_value());
assert(!e1Destroyed);
}
}
// e1.has_value() && !e2.has_value()
{
bool e2Destroyed = false;
std::expected<void, ThrowOnMove> e1(std::in_place);
std::expected<void, ThrowOnMove> e2(std::unexpect, e2Destroyed);
try {
swap(e1, e2);
assert(false);
} catch (Except) {
assert(e1.has_value());
assert(!e2.has_value());
assert(!e2Destroyed);
}
}
#endif // TEST_HAS_NO_EXCEPTIONS
}
int main(int, char**) {
test();
static_assert(test());
testException();
return 0;
}
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