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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
// <flat_set>
// explicit flat_set(container_type key_cont, const key_compare& comp = key_compare());
// template<class Allocator>
// flat_set(const container_type& key_cont, const Allocator& a);
// template<class Alloc>
// flat_set(const container_type& key_cont, const key_compare& comp, const Alloc& a);
#include <algorithm>
#include <deque>
#include <flat_set>
#include <functional>
#include <type_traits>
#include <vector>
#include "min_allocator.h"
#include "MoveOnly.h"
#include "test_allocator.h"
#include "test_iterators.h"
#include "test_macros.h"
#include "../../../test_compare.h"
template <class T>
void conversion_test(T);
template <class T, class... Args>
concept ImplicitlyConstructible = requires(Args&&... args) { conversion_test<T>({std::forward<Args>(args)...}); };
template <template <class...> class KeyContainer>
constexpr void test() {
{
// flat_set(container_type)
using M = std::flat_set<int, std::less<int>, KeyContainer<int>>;
KeyContainer<int> ks = {1, 1, 1, 2, 2, 3, 2, 3, 3};
auto m = M(ks);
assert(std::ranges::equal(m, std::vector<int>{1, 2, 3}));
// explicit
static_assert(std::is_constructible_v<M, const KeyContainer<int>&>);
static_assert(!ImplicitlyConstructible<M, const KeyContainer<int>&>);
}
{
// flat_set(container_type)
// move-only
MoveOnly expected[] = {3, 2, 1};
using Ks = KeyContainer<MoveOnly, min_allocator<MoveOnly>>;
using M = std::flat_set<MoveOnly, std::greater<MoveOnly>, Ks>;
Ks ks;
ks.push_back(1);
ks.push_back(3);
ks.push_back(2);
auto m = M(std::move(ks));
assert(ks.empty()); // it was moved-from
assert(std::ranges::equal(m, expected));
}
{
// flat_set(container_type)
// container's allocator is used
using A = test_allocator<int>;
using M = std::flat_set<int, std::less<int>, KeyContainer<int, A>>;
auto ks = KeyContainer<int, A>({1, 1, 1, 2, 2, 3, 2, 3, 3}, A(5));
auto m = M(std::move(ks));
assert(ks.empty()); // it was moved-from
assert((m == M{1, 2, 3}));
auto keys = std::move(m).extract();
assert(keys.get_allocator() == A(5));
}
{
// flat_set(container_type , key_compare)
using C = test_less<int>;
using M = std::flat_set<int, C, KeyContainer<int>>;
KeyContainer<int> ks = {1, 1, 1, 2, 2, 3, 2, 3, 3};
auto m = M(ks, C(4));
assert(std::ranges::equal(m, std::vector<int>{1, 2, 3}));
assert(m.key_comp() == C(4));
// explicit
static_assert(std::is_constructible_v<M, const KeyContainer<int>&, const C&>);
static_assert(!ImplicitlyConstructible<M, const KeyContainer<int>&, const C&>);
}
{
// flat_set(container_type , const Allocator&)
using A = test_allocator<int>;
using M = std::flat_set<int, std::less<int>, KeyContainer<int, A>>;
auto ks = KeyContainer<int, A>({1, 1, 1, 2, 2, 3, 2, 3, 3}, A(5));
auto m = M(ks, A(4)); // replaces the allocators
assert(!ks.empty()); // it was an lvalue above
assert((m == M{1, 2, 3}));
auto keys = M(m).extract();
assert(keys.get_allocator() == A(4));
// explicit(false)
static_assert(ImplicitlyConstructible<M, const KeyContainer<int, A>&, const A&>);
M m2 = {ks, A(4)}; // implicit ctor
assert(!ks.empty()); // it was an lvalue above
assert(m2 == m);
auto keys2 = std::move(m).extract();
assert(keys2.get_allocator() == A(4));
}
{
// flat_set(container_type , key_compare, const Allocator&)
using C = test_less<int>;
using A = test_allocator<int>;
using M = std::flat_set<int, C, KeyContainer<int, A>>;
KeyContainer<int, A> ks = {1, 1, 1, 2, 2, 3, 2, 3, 3};
auto m = M(ks, C(4), A(5));
assert(std::ranges::equal(m, std::vector<int, A>{1, 2, 3}));
assert(m.key_comp() == C(4));
auto m_copy = m;
auto keys = std::move(m_copy).extract();
assert(keys.get_allocator() == A(5));
// explicit(false)
static_assert(ImplicitlyConstructible<M, const KeyContainer<int, A>&, const A&>);
M m2 = {ks, C(4), A(5)};
assert(m2 == m);
assert(m2.key_comp() == C(4));
keys = std::move(m2).extract();
assert(keys.get_allocator() == A(5));
}
}
constexpr bool test() {
{
// The constructors in this subclause shall not participate in overload
// resolution unless uses_allocator_v<container_type, Alloc> is true.
using C = test_less<int>;
using A1 = test_allocator<int>;
using A2 = other_allocator<int>;
using V1 = std::vector<int, A1>;
using V2 = std::vector<int, A2>;
using M1 = std::flat_set<int, C, V1>;
using M2 = std::flat_set<int, C, V2>;
static_assert(std::is_constructible_v<M1, const V1&, const A1&>);
static_assert(std::is_constructible_v<M2, const V2&, const A2&>);
static_assert(!std::is_constructible_v<M1, const V1&, const A2&>);
static_assert(!std::is_constructible_v<M2, const V2&, const A1&>);
static_assert(std::is_constructible_v<M1, const V1&, const C&, const A1&>);
static_assert(std::is_constructible_v<M2, const V2&, const C&, const A2&>);
static_assert(!std::is_constructible_v<M1, const V1&, const C&, const A2&>);
static_assert(!std::is_constructible_v<M2, const V2&, const C&, const A1&>);
}
test<std::vector>();
#ifndef __cpp_lib_constexpr_deque
if (!TEST_IS_CONSTANT_EVALUATED)
#endif
test<std::deque>();
return true;
}
int main(int, char**) {
test();
#if TEST_STD_VER >= 26
static_assert(test());
#endif
return 0;
}
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