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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_map>
// template <class... Args>
// iterator emplace_hint(const_iterator position, Args&&... args);
#include <flat_map>
#include <cassert>
#include <deque>
#include <functional>
#include <vector>
#include "MinSequenceContainer.h"
#include "test_macros.h"
#include "../../../Emplaceable.h"
#include "DefaultOnly.h"
#include "min_allocator.h"
#include "../helpers.h"
#if defined(_LIBCPP_VERSION)
// spec only specifies `emplace(Args&&...)` is_constructible_v<pair<key_type, mapped_type>, Args...> is true.
// nothing mentioned for emplace_hint
template <class M, class... Args>
concept CanEmplaceHint =
requires(M m, typename M::const_iterator i, Args&&... args) { m.emplace_hint(i, std::forward<Args>(args)...); };
using Map = std::flat_map<Emplaceable, Emplaceable>;
static_assert(CanEmplaceHint<Map>);
static_assert(CanEmplaceHint<Map, Emplaceable, Emplaceable>);
static_assert(CanEmplaceHint<Map, std::piecewise_construct_t, std::tuple<int, double>, std::tuple<int, double>>);
static_assert(!CanEmplaceHint<Map, Emplaceable>);
static_assert(!CanEmplaceHint<Map, int, double>);
#endif
template <class KeyContainer, class ValueContainer>
void test() {
using Key = typename KeyContainer::value_type;
using Value = typename ValueContainer::value_type;
using M = std::flat_map<Key, Value, std::less<Key>, KeyContainer, ValueContainer>;
using R = M::iterator;
{
// was empty
M m;
std::same_as<R> decltype(auto) r = m.emplace_hint(m.end(), typename M::value_type(2, 3.5));
assert(r == m.begin());
assert(m.size() == 1);
assert(r->first == 2);
assert(r->second == 3.5);
}
{
// hints correct at the begin
M m = {{3, 3.0}, {4, 4.0}};
auto hint = m.begin();
std::same_as<R> decltype(auto) r = m.emplace_hint(hint, typename M::value_type(2, 2.0));
assert(r == m.begin());
assert(m.size() == 3);
assert(r->first == 2);
assert(r->second == 2.0);
}
{
// hints correct in the middle
M m = {{0, 0.0}, {1, 1.0}, {3, 3.0}, {4, 4.0}};
auto hint = m.begin() + 2;
std::same_as<R> decltype(auto) r = m.emplace_hint(hint, typename M::value_type(2, 2.0));
assert(r == m.begin() + 2);
assert(m.size() == 5);
assert(r->first == 2);
assert(r->second == 2.0);
}
{
// hints correct at the end
M m = {{0, 0.0}, {1, 1.0}};
auto hint = m.end();
std::same_as<R> decltype(auto) r = m.emplace_hint(hint, typename M::value_type(2, 2.0));
assert(r == m.begin() + 2);
assert(m.size() == 3);
assert(r->first == 2);
assert(r->second == 2.0);
}
{
// hints correct but key already exists
M m = {{0, 0.0}, {1, 1.0}, {2, 1.9}, {3, 3.0}, {4, 4.0}};
auto hint = m.begin() + 2;
std::same_as<R> decltype(auto) r = m.emplace_hint(hint, typename M::value_type(2, 2.0));
assert(r == m.begin() + 2);
assert(m.size() == 5);
assert(r->first == 2);
assert(r->second == 1.9);
}
{
// hints incorrectly at the begin
M m = {{1, 1.0}, {4, 4.0}};
auto hint = m.begin();
std::same_as<R> decltype(auto) r = m.emplace_hint(hint, typename M::value_type(2, 2.0));
assert(r == m.begin() + 1);
assert(m.size() == 3);
assert(r->first == 2);
assert(r->second == 2.0);
}
{
// hints incorrectly in the middle
M m = {{0, 0.0}, {1, 1.0}, {3, 3.0}, {4, 4.0}};
auto hint = m.begin() + 1;
std::same_as<R> decltype(auto) r = m.emplace_hint(hint, typename M::value_type(2, 2.0));
assert(r == m.begin() + 2);
assert(m.size() == 5);
assert(r->first == 2);
assert(r->second == 2.0);
}
{
// hints incorrectly at the end
M m = {{0, 0.0}, {3, 3.0}};
auto hint = m.end();
std::same_as<R> decltype(auto) r = m.emplace_hint(hint, typename M::value_type(2, 2.0));
assert(r == m.begin() + 1);
assert(m.size() == 3);
assert(r->first == 2);
assert(r->second == 2.0);
}
{
// hints incorrect and key already exists
M m = {{0, 0.0}, {1, 1.0}, {2, 1.9}, {3, 3.0}, {4, 4.0}};
auto hint = m.begin();
std::same_as<R> decltype(auto) r = m.emplace_hint(hint, typename M::value_type(2, 2.0));
assert(r == m.begin() + 2);
assert(m.size() == 5);
assert(r->first == 2);
assert(r->second == 1.9);
}
}
template <class KeyContainer, class ValueContainer>
void test_emplaceable() {
using M = std::flat_map<int, Emplaceable, std::less<int>, KeyContainer, ValueContainer>;
using R = M::iterator;
M m;
ASSERT_SAME_TYPE(decltype(m.emplace_hint(m.cbegin())), R);
R r = m.emplace_hint(m.end(), std::piecewise_construct, std::forward_as_tuple(2), std::forward_as_tuple());
assert(r == m.begin());
assert(m.size() == 1);
assert(m.begin()->first == 2);
assert(m.begin()->second == Emplaceable());
r = m.emplace_hint(m.end(), std::piecewise_construct, std::forward_as_tuple(1), std::forward_as_tuple(2, 3.5));
assert(r == m.begin());
assert(m.size() == 2);
assert(m.begin()->first == 1);
assert(m.begin()->second == Emplaceable(2, 3.5));
r = m.emplace_hint(m.end(), std::piecewise_construct, std::forward_as_tuple(1), std::forward_as_tuple(2, 3.5));
assert(r == m.begin());
assert(m.size() == 2);
assert(m.begin()->first == 1);
assert(m.begin()->second == Emplaceable(2, 3.5));
}
int main(int, char**) {
test<std::vector<int>, std::vector<double>>();
test<std::deque<int>, std::vector<double>>();
test<MinSequenceContainer<int>, MinSequenceContainer<double>>();
test<std::vector<int, min_allocator<int>>, std::vector<double, min_allocator<double>>>();
test_emplaceable<std::vector<int>, std::vector<Emplaceable>>();
test_emplaceable<std::deque<int>, std::vector<Emplaceable>>();
test_emplaceable<MinSequenceContainer<int>, MinSequenceContainer<Emplaceable>>();
test_emplaceable<std::vector<int, min_allocator<int>>, std::vector<Emplaceable, min_allocator<Emplaceable>>>();
{
auto emplace_func = [](auto& m, auto key_arg, auto value_arg) {
m.emplace_hint(m.begin(), std::piecewise_construct, std::tuple(key_arg), std::tuple(value_arg));
};
test_emplace_exception_guarantee(emplace_func);
}
return 0;
}
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