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
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
|
// Copyright 2005-2009 Daniel James.
// Copyright 2021 Peter Dimov.
// Distributed under the Boost Software License, Version 1.0.
// https://www.boost.org/LICENSE_1_0.txt
#include <boost/container_hash/hash.hpp>
#include <boost/core/lightweight_test.hpp>
#include <boost/core/type_name.hpp>
#include <set>
#if defined(BOOST_MSVC)
# pragma warning(disable: 4244) // conversion from int to float
#endif
#if defined(__GNUC__) || defined(__clang__)
# pragma GCC diagnostic ignored "-Wconversion"
# pragma GCC diagnostic ignored "-Wsign-conversion"
#endif
// This test checks for collisions in a small range of numbers
template<class T, int M>
void collision_test_()
{
std::set<std::size_t> hashes;
for( int i = -128; i <= 127; ++i )
{
hashes.insert( boost::hash<T>()( i * M ) );
}
BOOST_TEST_EQ( hashes.size(), 256u );
}
template <class T>
void collision_test()
{
collision_test_<T, 1>();
collision_test_<T, 2>();
collision_test_<T, 3>();
collision_test_<T, 4>();
collision_test_<T, 5>();
collision_test_<T, 8>();
collision_test_<T, 10>();
collision_test_<T, 16>();
collision_test_<T, 32>();
collision_test_<T, 64>();
collision_test_<T, 100>();
collision_test_<T, 128>();
}
#define TEST(type) std::cerr << "Testing: " #type " (" << boost::core::type_name<type>() << ")\n"; collision_test<type>();
int main()
{
#ifndef BOOST_NO_INTRINSIC_WCHAR_T
TEST(wchar_t)
#endif
#ifndef BOOST_NO_CXX11_CHAR16_T
TEST(char16_t)
#endif
#ifndef BOOST_NO_CXX11_CHAR32_T
TEST(char32_t)
#endif
TEST(short)
TEST(unsigned short)
TEST(int)
TEST(unsigned int)
TEST(long)
TEST(unsigned long)
#if !defined(BOOST_NO_LONG_LONG)
TEST(boost::long_long_type)
TEST(boost::ulong_long_type)
#endif
#if defined(BOOST_HAS_INT128)
TEST(boost::int128_type)
TEST(boost::uint128_type)
#endif
TEST(float)
TEST(double)
TEST(long double)
TEST(std::size_t)
TEST(std::ptrdiff_t)
return boost::report_errors();
}
|
