1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
|
//===----------------------------------------------------------------------===//
//
// 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
// <map>
// class multimap
// template<typename K>
// size_type count(const K& x) const; // C++14
#include <cassert>
#include <map>
#include <utility>
struct Comp {
using is_transparent = void;
bool operator()(const std::pair<int, int> &lhs,
const std::pair<int, int> &rhs) const {
return lhs < rhs;
}
bool operator()(const std::pair<int, int> &lhs, int rhs) const {
return lhs.first < rhs;
}
bool operator()(int lhs, const std::pair<int, int> &rhs) const {
return lhs < rhs.first;
}
};
int main(int, char**) {
std::multimap<std::pair<int, int>, int, Comp> s{
{{2, 1}, 1}, {{1, 1}, 2}, {{1, 1}, 3}, {{1, 1}, 4}, {{2, 2}, 5}};
auto cnt = s.count(1);
assert(cnt == 3);
return 0;
}
|
