1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
10
11// <flat_map>
12
13// mapped_type& operator[](const key_type& k);
14
15#include <cassert>
16#include <deque>
17#include <flat_map>
18#include <functional>
19#include <vector>
20
21#include "MinSequenceContainer.h"
22#include "../helpers.h"
23#include "min_allocator.h"
24#include "test_macros.h"
25
26// Constraints: is_constructible_v<mapped_type> is true.
27template <class M, class Input>
28concept CanIndex = requires(M m, Input k) { m[k]; };
29
30static_assert(CanIndex<std::flat_map<int, double>, const int&>);
31static_assert(!CanIndex<std::flat_map<int, NoDefaultCtr>, const int&>);
32
33template <class KeyContainer, class ValueContainer>
34void test() {
35 using P = std::pair<int, double>;
36 P ar[] = {
37 P(1, 1.5),
38 P(2, 2.5),
39 P(3, 3.5),
40 P(4, 4.5),
41 P(5, 5.5),
42 P(7, 7.5),
43 P(8, 8.5),
44 };
45 const int one = 1;
46 std::flat_map<int, double, std::less<int>, KeyContainer, ValueContainer> m(ar, ar + sizeof(ar) / sizeof(ar[0]));
47 ASSERT_SAME_TYPE(decltype(m[one]), double&);
48 assert(m.size() == 7);
49 assert(m[one] == 1.5);
50 assert(m.size() == 7);
51 m[1] = -1.5;
52 assert(m[1] == -1.5);
53 assert(m.size() == 7);
54 assert(m[6] == 0);
55 assert(m.size() == 8);
56 m[6] = 6.5;
57 assert(m[6] == 6.5);
58 assert(m.size() == 8);
59}
60
61int main(int, char**) {
62 test<std::vector<int>, std::vector<double>>();
63 test<std::deque<int>, std::vector<double>>();
64 test<MinSequenceContainer<int>, MinSequenceContainer<double>>();
65 test<std::vector<int, min_allocator<int>>, std::vector<double, min_allocator<double>>>();
66
67 {
68 auto index_func = [](auto& m, auto key_arg, auto value_arg) {
69 using FlatMap = std::decay_t<decltype(m)>;
70 const typename FlatMap::key_type key = key_arg;
71 const typename FlatMap::mapped_type value = value_arg;
72 m[key] = value;
73 };
74 test_emplace_exception_guarantee(emplace_function&: index_func);
75 }
76 return 0;
77}
78

source code of libcxx/test/std/containers/container.adaptors/flat.map/flat.map.access/index_key.pass.cpp