load_factor.pass.cpp revision 7a6b7cedcb3359ad7d77e355b02ab982d9d2b25b 
1//===----------------------------------------------------------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is dual licensed under the MIT and the University of Illinois Open
6// Source Licenses. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10// <unordered_set>
11
12// template <class Value, class Hash = hash<Value>, class Pred = equal_to<Value>,
13//           class Alloc = allocator<Value>>
14// class unordered_multiset
15
16// float load_factor() const
17
18#include <unordered_set>
19#include <cassert>
20#include <cfloat>
21
22#include "../../min_allocator.h"
23
24int main()
25{
26    {
27        typedef std::unordered_multiset<int> C;
28        typedef int P;
29        P a[] =
30        {
31            P(10),
32            P(20),
33            P(30),
34            P(40),
35            P(50),
36            P(60),
37            P(70),
38            P(80)
39        };
40        const C c(std::begin(a), std::end(a));
41        assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
42    }
43    {
44        typedef std::unordered_multiset<int> C;
45        typedef int P;
46        const C c;
47        assert(c.load_factor() == 0);
48    }
49#if __cplusplus >= 201103L
50    {
51        typedef std::unordered_multiset<int, std::hash<int>,
52                                      std::equal_to<int>, min_allocator<int>> C;
53        typedef int P;
54        P a[] =
55        {
56            P(10),
57            P(20),
58            P(30),
59            P(40),
60            P(50),
61            P(60),
62            P(70),
63            P(80)
64        };
65        const C c(std::begin(a), std::end(a));
66        assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
67    }
68    {
69        typedef std::unordered_multiset<int, std::hash<int>,
70                                      std::equal_to<int>, min_allocator<int>> C;
71        typedef int P;
72        const C c;
73        assert(c.load_factor() == 0);
74    }
75#endif
76}
77