-
Notifications
You must be signed in to change notification settings - Fork 26
Expand file tree
/
Copy pathtest_num_digits.cpp
More file actions
108 lines (88 loc) · 2.31 KB
/
test_num_digits.cpp
File metadata and controls
108 lines (88 loc) · 2.31 KB
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
// Copyright 2023 Matt Borland
// Distributed under the Boost Software License, Version 1.0.
// https://www.boost.org/LICENSE_1_0.txt
#include <boost/charconv/detail/integer_search_trees.hpp>
#include <boost/charconv/detail/emulated128.hpp>
#include <boost/charconv/config.hpp>
#include <boost/core/lightweight_test.hpp>
#include <type_traits>
#include <limits>
#if defined(__GNUC__) && (__GNUC__ < 7)
# pragma GCC diagnostic push
# pragma GCC diagnostic ignored "-Woverflow"
#endif
#ifdef BOOST_CHARCONV_HAS_INT128
// Test the u128 impl
template <typename T>
void test128()
{
T max = BOOST_CHARCONV_UINT128_MAX;
max /= 10;
T val = 1;
int i = 1;
while (val < max)
{
BOOST_TEST_EQ(boost::charconv::detail::num_digits(val), i);
++i;
val *= 10;
}
BOOST_TEST_EQ(boost::charconv::detail::num_digits(max * 10), 39);
}
#endif
#if defined(__GNUC__) && (__GNUC__ < 7)
# pragma GCC diagnostic pop
#endif
#if defined(__GNUC__) && (__GNUC__ >= 5)
# pragma GCC diagnostic push
# pragma GCC diagnostic ignored "-Wconversion"
#endif
// Tests the generic, u32, and u64 impls
template <typename T>
void test()
{
constexpr T max = (std::numeric_limits<T>::max)() / 10;
T val = 1;
int i = 1;
while (val < max)
{
BOOST_TEST_EQ(boost::charconv::detail::num_digits(val), i);
++i;
val *= static_cast<T>(10);
}
BOOST_TEST_EQ(boost::charconv::detail::num_digits(val), std::numeric_limits<T>::digits10 + 1);
}
#if defined(__GNUC__) && (__GNUC__ >= 5)
# pragma GCC diagnostic pop
#endif
void test_emulated128()
{
using namespace boost::charconv::detail;
uint128 v1 {0, 1234};
BOOST_TEST_EQ(num_digits(v1), 4);
uint128 v2 {1234, 0};
BOOST_TEST_EQ(num_digits(v2), 23);
uint128 v3 {UINT64_MAX, UINT64_MAX};
BOOST_TEST_EQ(num_digits(v3), 39);
}
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 tables
test<std::uint32_t>();
test<std::uint64_t>();
#ifdef BOOST_CHARCONV_HAS_INT128
test128<boost::uint128_type>();
#endif
test_emulated128();
return boost::report_errors();
}