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// class unordered_map
12
13// size_type max_size() const;
14
15#include <cassert>
16#include <limits>
17#include <type_traits>
18#include <unordered_map>
19
20#include "test_allocator.h"
21#include "test_macros.h"
22
23int main(int, char**)
24{
25 typedef std::pair<const int, int> KV;
26 {
27 typedef limited_allocator<KV, 10> A;
28 typedef std::unordered_map<int, int, std::hash<int>, std::equal_to<int>, A>
29 C;
30 C c;
31 assert(c.max_size() <= 10);
32 LIBCPP_ASSERT(c.max_size() == 10);
33 }
34 {
35 typedef limited_allocator<KV, (std::size_t)-1> A;
36 typedef std::unordered_map<int, int, std::hash<int>, std::equal_to<int>, A>
37 C;
38 const C::size_type max_dist =
39 static_cast<C::size_type>(std::numeric_limits<C::difference_type>::max());
40 C c;
41 assert(c.max_size() <= max_dist);
42 LIBCPP_ASSERT(c.max_size() == max_dist);
43 }
44 {
45 typedef std::unordered_map<char, int> C;
46 const C::size_type max_dist =
47 static_cast<C::size_type>(std::numeric_limits<C::difference_type>::max());
48 C c;
49 assert(c.max_size() <= max_dist);
50 assert(c.max_size() <= alloc_max_size(c.get_allocator()));
51 }
52
53 return 0;
54}
55

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