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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>
// template<class K> pair<iterator,iterator> equal_range(const K& x);
// template<class K> pair<const_iterator,const_iterator> equal_range(const K& x) const;
#include <cassert>
#include <deque>
#include <flat_set>
#include <functional>
#include <string>
#include <utility>
#include "MinSequenceContainer.h"
#include "../helpers.h"
#include "test_macros.h"
#include "min_allocator.h"
// Constraints: The qualified-id Compare::is_transparent is valid and denotes a type.
template <class M>
concept CanEqualRange = requires(M m, Transparent<int> k) { m.equal_range(k); };
using TransparentSet = std::flat_set<int, TransparentComparator>;
using NonTransparentSet = std::flat_set<int, NonTransparentComparator>;
static_assert(CanEqualRange<TransparentSet>);
static_assert(CanEqualRange<const TransparentSet>);
static_assert(!CanEqualRange<NonTransparentSet>);
static_assert(!CanEqualRange<const NonTransparentSet>);
template <class KeyContainer>
constexpr void test_one() {
using Key = typename KeyContainer::value_type;
using M = std::flat_set<Key, TransparentComparator, KeyContainer>;
using R = std::pair<typename M::iterator, typename M::iterator>;
using CR = std::pair<typename M::const_iterator, typename M::const_iterator>;
auto test_found = [](auto&& map, const std::string& expected_key) {
auto [first, last] = map.equal_range(Transparent<std::string>{expected_key});
assert(last - first == 1);
assert(*first == expected_key);
};
auto test_not_found = [](auto&& map, const std::string& expected_key, long expected_offset) {
auto [first, last] = map.equal_range(Transparent<std::string>{expected_key});
assert(first == last);
assert(first - map.begin() == expected_offset);
};
{
M m = {"alpha", "beta", "epsilon", "eta", "gamma"};
const auto& cm = m;
ASSERT_SAME_TYPE(decltype(m.equal_range(Transparent<std::string>{"abc"})), R);
ASSERT_SAME_TYPE(decltype(std::as_const(m).equal_range(Transparent<std::string>{"b"})), CR);
test_found(m, "alpha");
test_found(m, "beta");
test_found(m, "epsilon");
test_found(m, "eta");
test_found(m, "gamma");
test_found(cm, "alpha");
test_found(cm, "beta");
test_found(cm, "epsilon");
test_found(cm, "eta");
test_found(cm, "gamma");
test_not_found(m, "charlie", 2);
test_not_found(m, "aaa", 0);
test_not_found(m, "zzz", 5);
test_not_found(cm, "charlie", 2);
test_not_found(cm, "aaa", 0);
test_not_found(cm, "zzz", 5);
}
{
// empty
M m;
const auto& cm = m;
test_not_found(m, "aaa", 0);
test_not_found(cm, "charlie", 0);
}
}
constexpr bool test() {
test_one<std::vector<std::string>>();
#ifndef __cpp_lib_constexpr_deque
if (!TEST_IS_CONSTANT_EVALUATED)
#endif
test_one<std::deque<std::string>>();
test_one<MinSequenceContainer<std::string>>();
test_one<std::vector<std::string, min_allocator<std::string>>>();
{
bool transparent_used = false;
TransparentComparator c(transparent_used);
std::flat_set<int, TransparentComparator> m(std::sorted_unique, {1, 2, 3}, c);
assert(!transparent_used);
auto p = m.equal_range(Transparent<int>{3});
assert(p.first != p.second);
assert(transparent_used);
}
{
// LWG4239 std::string and C string literal
using M = std::flat_set<std::string, std::less<>>;
M m{"alpha", "beta", "epsilon", "eta", "gamma"};
auto [first, last] = m.equal_range("beta");
assert(first == m.begin() + 1);
assert(last == m.begin() + 2);
}
return true;
}
int main(int, char**) {
test();
#if TEST_STD_VER >= 26
static_assert(test());
#endif
return 0;
}
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