103 lines
2.7 KiB
C++
103 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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// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
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// <flat_set>
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// container_type extract() &&;
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#include <algorithm>
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#include <concepts>
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#include <deque>
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#include <flat_set>
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#include <functional>
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#include <vector>
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#include "MinSequenceContainer.h"
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#include "../helpers.h"
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#include "test_macros.h"
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#include "min_allocator.h"
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template <class T>
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concept CanExtract = requires(T&& t) { std::forward<T>(t).extract(); };
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static_assert(CanExtract<std::flat_multiset<int>&&>);
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static_assert(!CanExtract<std::flat_multiset<int>&>);
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static_assert(!CanExtract<std::flat_multiset<int> const&>);
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static_assert(!CanExtract<std::flat_multiset<int> const&&>);
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template <class KeyContainer>
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void test_one() {
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using M = std::flat_multiset<int, std::less<int>, KeyContainer>;
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{
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M m = M({1, 1, 3});
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std::same_as<KeyContainer> auto keys = std::move(m).extract();
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auto expected_keys = {1, 1, 3};
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assert(std::ranges::equal(keys, expected_keys));
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check_invariant(m);
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LIBCPP_ASSERT(m.empty());
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}
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{
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// was empty
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M m;
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assert(m.empty());
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auto keys = std::move(m).extract();
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assert(keys.empty());
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LIBCPP_ASSERT(m.empty());
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}
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}
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void test() {
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test_one<std::vector<int>>();
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test_one<std::deque<int>>();
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test_one<MinSequenceContainer<int>>();
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test_one<std::vector<int, min_allocator<int>>>();
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{
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// extracted object maintains invariant if the underlying container does not clear after move
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using M = std::flat_multiset<int, std::less<>, CopyOnlyVector<int>>;
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M m = M({1, 1, 3});
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std::same_as<M::container_type> auto keys = std::move(m).extract();
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assert(keys.size() == 3);
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check_invariant(m);
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LIBCPP_ASSERT(m.empty());
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}
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}
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void test_exception() {
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{
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#ifndef TEST_HAS_NO_EXCEPTIONS
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using KeyContainer = ThrowOnMoveContainer<int>;
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using M = std::flat_multiset<int, std::ranges::less, KeyContainer>;
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M m;
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m.emplace(1);
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m.emplace(2);
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try {
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auto c = std::move(m).extract();
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assert(false);
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} catch (int) {
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check_invariant(m);
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// In libc++, we try to erase the key after value emplacement failure.
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// and after erasure failure, we clear the flat_multiset
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LIBCPP_ASSERT(m.size() == 0);
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}
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#endif
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}
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}
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int main(int, char**) {
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test();
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test_exception();
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return 0;
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}
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