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
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
|
// Copyright 2023 Matt Borland
// Distributed under the Boost Software License, Version 1.0.
// https://www.boost.org/LICENSE_1_0.txt
#include <boost/config.hpp>
#if !defined(BOOST_NO_CXX17_HDR_CHARCONV) && (!defined(__clang_major__) || (defined(__clang_major__) && __clang_major__ > 7))
#include <boost/charconv.hpp>
#include <boost/core/lightweight_test.hpp>
#include <charconv>
#include <type_traits>
#include <limits>
#include <cstring>
#include <cstdint>
#include <cerrno>
#include <utility>
#include <system_error>
#include <random>
#include <thread>
#include <vector>
template <typename T>
void stress_test_worker()
{
std::random_device rd;
std::mt19937_64 gen(rd());
std::uniform_int_distribution<T> dist((std::numeric_limits<T>::min)(), (std::numeric_limits<T>::max)());
std::mt19937_64 base_gen(rd());
std::uniform_int_distribution<int> base_dist(2, 36);
for (std::size_t i = 0; i < 100'000'000; ++i)
{
char buffer_stl[128] {};
char buffer_boost[128] {};
T v = dist(gen);
int base = base_dist(base_gen);
auto r_stl = std::to_chars(buffer_stl, buffer_stl + sizeof(buffer_stl) - 1, v, base);
auto r_boost = boost::charconv::to_chars(buffer_boost, buffer_boost + sizeof(buffer_boost) - 1, v, base);
BOOST_TEST_EQ(static_cast<std::ptrdiff_t>(r_stl.ptr - buffer_stl), static_cast<std::ptrdiff_t>(r_boost.ptr - buffer_boost));
BOOST_TEST_CSTR_EQ(buffer_stl, buffer_boost);
}
}
template <typename T>
void stress_test()
{
auto num_threads = std::thread::hardware_concurrency();
std::vector<std::thread> thread_manager(num_threads);
for (std::size_t i = 0; i < num_threads; ++i)
{
thread_manager.emplace_back(std::thread(stress_test_worker<T>));
}
for (std::size_t i = 0; i < thread_manager.size(); ++i)
{
if (thread_manager[i].joinable())
{
thread_manager[i].join();
}
}
}
template <typename T, int base = 10>
void random_tests()
{
std::mt19937_64 gen(42);
std::uniform_int_distribution<T> dist((std::numeric_limits<T>::min)(), (std::numeric_limits<T>::max)());
for (std::size_t i = 0; i < 100'000; ++i)
{
char buffer_stl[128] {};
char buffer_boost[128] {};
T v = dist(gen);
auto r_stl = std::to_chars(buffer_stl, buffer_stl + sizeof(buffer_stl) - 1, v, base);
auto r_boost = boost::charconv::to_chars(buffer_boost, buffer_boost + sizeof(buffer_boost) - 1, v, base);
BOOST_TEST_EQ(static_cast<std::ptrdiff_t>(r_stl.ptr - buffer_stl), static_cast<std::ptrdiff_t>(r_boost.ptr - buffer_boost));
BOOST_TEST_CSTR_EQ(buffer_stl, buffer_boost);
}
}
template <typename T>
void test()
{
// Signed 0
char buffer1_stl[64] {};
char buffer1_boost[64] {};
T v1 = static_cast<T>(-0);
auto r1_stl = std::to_chars(buffer1_stl, buffer1_stl + sizeof(buffer1_stl) - 1, v1);
auto r1_boost = boost::charconv::to_chars(buffer1_boost, buffer1_boost + sizeof(buffer1_boost) - 1, v1);
BOOST_TEST_EQ(r1_stl.ptr, buffer1_stl + 1);
BOOST_TEST_EQ(r1_boost.ptr, buffer1_boost + 1);
BOOST_TEST_CSTR_EQ(buffer1_stl, "0");
BOOST_TEST_CSTR_EQ(buffer1_boost, "0");
// Binary
char buffer2_stl[64] {};
char buffer2_boost[64] {};
T v2 = static_cast<T>(42);
auto r2_stl = std::to_chars(buffer2_stl, buffer2_stl + sizeof(buffer2_stl) - 1, v2, 2);
auto r2_boost = boost::charconv::to_chars(buffer2_boost, buffer2_boost + sizeof(buffer2_boost) - 1, v2, 2);
BOOST_TEST_EQ(r2_stl.ptr, buffer2_stl + 6);
BOOST_TEST_EQ(r2_boost.ptr, buffer2_boost + 6);
BOOST_TEST_CSTR_EQ(buffer2_stl, "101010");
BOOST_TEST_CSTR_EQ(buffer2_boost, "101010");
// Base 10
char buffer3_stl[64] {};
char buffer3_boost[64] {};
T v3 = static_cast<T>(120);
auto r3_stl = std::to_chars(buffer3_stl, buffer3_stl + sizeof(buffer3_stl) - 1, v3);
auto r3_boost = boost::charconv::to_chars(buffer3_boost, buffer3_boost + sizeof(buffer3_boost) - 1, v3);
BOOST_TEST_EQ(r3_stl.ptr, buffer3_stl + 3);
BOOST_TEST_EQ(r3_boost.ptr, buffer3_boost + 3);
BOOST_TEST_CSTR_EQ(buffer3_stl, "120");
BOOST_TEST_CSTR_EQ(buffer3_boost, "120");
// Hexadecimal
char buffer4_stl[64] {};
char buffer4_boost[64] {};
T v4 = static_cast<T>(44);
auto r4_stl = std::to_chars(buffer4_stl, buffer4_stl + sizeof(buffer4_stl) - 1, v4, 16);
auto r4_boost = boost::charconv::to_chars(buffer4_boost, buffer4_boost + sizeof(buffer4_boost) - 1, v4, 16);
BOOST_TEST_EQ(r4_stl.ptr, buffer4_stl + 2);
BOOST_TEST_EQ(r4_boost.ptr, buffer4_boost + 2);
BOOST_TEST_CSTR_EQ(buffer4_stl, "2c");
BOOST_TEST_CSTR_EQ(buffer4_boost, "2c");
// Base 28
char buffer5_stl[64] {};
char buffer5_boost[64] {};
T v5 = static_cast<T>(100);
auto r5_stl = std::to_chars(buffer5_stl, buffer5_stl + sizeof(buffer5_stl) - 1, v5, 28);
auto r5_boost = boost::charconv::to_chars(buffer5_boost, buffer5_boost + sizeof(buffer5_boost) - 1, v5, 28);
BOOST_TEST_EQ(r5_stl.ptr, buffer5_stl + 2);
BOOST_TEST_EQ(r5_boost.ptr, buffer5_boost + 2);
BOOST_TEST_CSTR_EQ(buffer5_stl, "3g");
BOOST_TEST_CSTR_EQ(buffer5_boost, "3g");
// Overflow
char buffer6_stl[1] {};
char buffer6_boost[1] {};
T v6 = static_cast<T>(100);
auto r6_stl = std::to_chars(buffer6_stl, buffer6_stl + sizeof(buffer6_stl) - 1, v6);
auto r6_boost = boost::charconv::to_chars(buffer6_boost, buffer6_boost + sizeof(buffer6_boost) - 1, v6);
BOOST_TEST_EQ(r6_stl.ptr, r6_stl.ptr);
BOOST_TEST_EQ(r6_boost.ptr, r6_boost.ptr);
}
int main()
{
test<char>();
test<signed char>();
test<unsigned char>();
test<short>();
test<unsigned short>();
test<int>();
test<unsigned>();
test<long>();
test<unsigned long>();
test<long long>();
test<unsigned long long>();
// Specialized bases
random_tests<int, 2>();
random_tests<int, 4>();
random_tests<int, 8>();
random_tests<int, 16>();
random_tests<int, 32>();
#ifndef _MSC_VER // MSVC does not allow for 8-bit ints in std::uniform_int_distribution
random_tests<std::int8_t, 10>();
random_tests<std::uint8_t, 10>();
#endif
random_tests<std::int16_t, 10>();
random_tests<std::uint16_t, 10>();
random_tests<std::int32_t, 10>();
random_tests<std::uint32_t, 10>();
random_tests<std::int64_t, 10>();
random_tests<std::uint64_t, 10>();
// Generic implementation
random_tests<int, 23>();
// Stress tests are disabled for CI
#ifdef BOOST_CHARCONV_STRESS_TEST
stress_test<int>();
#endif
return boost::report_errors();
}
#else
int main()
{
return 0;
}
#endif
|
