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// <unordered_map>
10
11// template <class Key, class T, class Hash = hash<Key>, class Pred = equal_to<Key>,
12// class Alloc = allocator<pair<const Key, T>>>
13// class unordered_map
14
15// size_type bucket_size(size_type n) const
16
17#include <unordered_map>
18#include <string>
19#include <cassert>
20#include <iterator>
21
22#include "test_macros.h"
23#include "min_allocator.h"
24
25int main(int, char**) {
26 {
27 typedef std::unordered_map<int, std::string> C;
28 typedef std::pair<int, std::string> P;
29 P a[] = {
30 P(1, "one"),
31 P(2, "two"),
32 P(3, "three"),
33 P(4, "four"),
34 P(1, "four"),
35 P(2, "four"),
36 };
37 const C c(std::begin(arr&: a), std::end(arr&: a));
38 assert(c.bucket_count() >= 5);
39 LIBCPP_ASSERT(c.bucket_size(n: 0) == 0);
40 LIBCPP_ASSERT(c.bucket_size(n: 1) == 1);
41 LIBCPP_ASSERT(c.bucket_size(n: 2) == 1);
42 LIBCPP_ASSERT(c.bucket_size(n: 3) == 1);
43 LIBCPP_ASSERT(c.bucket_size(n: 4) == 1);
44 }
45#if TEST_STD_VER >= 11
46 {
47 typedef std::unordered_map<int,
48 std::string,
49 std::hash<int>,
50 std::equal_to<int>,
51 min_allocator<std::pair<const int, std::string>>>
52 C;
53 typedef std::pair<int, std::string> P;
54 P a[] = {
55 P(1, "one"),
56 P(2, "two"),
57 P(3, "three"),
58 P(4, "four"),
59 P(1, "four"),
60 P(2, "four"),
61 };
62 const C c(std::begin(a), std::end(a));
63 assert(c.bucket_count() >= 5);
64 LIBCPP_ASSERT(c.bucket_size(0) == 0);
65 LIBCPP_ASSERT(c.bucket_size(1) == 1);
66 LIBCPP_ASSERT(c.bucket_size(2) == 1);
67 LIBCPP_ASSERT(c.bucket_size(3) == 1);
68 LIBCPP_ASSERT(c.bucket_size(4) == 1);
69 }
70#endif
71
72 return 0;
73}
74

source code of libcxx/test/std/containers/unord/unord.map/bucket_size.pass.cpp