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
|
#include <cstddef>
#include <cstdint>
#include <cstdlib>
#include <cstring>
#include <glaze/glaze.hpp>
#include <iostream>
#include <thread>
#include <vector>
// must be outside test(), compilation fails on gcc 13 otherwise
template <typename T>
struct Value
{
T value{};
};
template <typename T>
void test()
{
using S = Value<T>;
using UT = std::make_unsigned_t<T>;
auto testone = [](const UT loopvar, auto& outbuf) {
S s;
std::memcpy(&s.value, &loopvar, sizeof(T));
outbuf.clear();
const auto writeec = glz::write_json(s, outbuf);
if (writeec) [[unlikely]] {
std::cerr << "failed writing " << s.value << " to json\n";
std::abort();
}
auto restored = glz::read_json<S>(outbuf);
if (!restored) [[unlikely]] {
std::cerr << "failed parsing " << outbuf << '\n';
std::abort();
}
if (const auto r = restored.value().value; r != s.value) [[unlikely]] {
std::cerr << "failed roundtrip, got " << r << " instead of " << s.value << //
" (diff is " << r - s.value << ") when parsing " << outbuf << '\n';
std::abort();
}
};
auto testrange = [&](const UT start, const UT stop) {
std::string outbuf;
for (UT i = start; i < stop; ++i) {
testone(i, outbuf);
}
};
const auto nthreads = std::thread::hardware_concurrency();
const UT step = (std::numeric_limits<UT>::max)() / nthreads;
// can't use jthread, does not exist in all stdlibs.
std::vector<std::thread> threads;
threads.reserve(nthreads);
for (size_t threadi = 0; threadi < nthreads; ++threadi) {
const UT start = threadi * step;
const UT stop = (threadi == nthreads - 1) ? (std::numeric_limits<UT>::max)() : start + step;
// std::cout << "thread i=" << threadi << " goes from " << start << " to " << stop << '\n';
threads.emplace_back(testrange, start, stop);
}
// test the last value here.
{
std::string buf;
testone((std::numeric_limits<UT>::max)(), buf);
}
std::cout << "started testing in " << nthreads << " threads." << std::endl;
for (auto& t : threads) {
t.join();
}
std::cout << "tested " << (std::numeric_limits<UT>::max)() << " values of " << (std::is_unsigned_v<T> ? "un" : "")
<< "signed type of size " << sizeof(T) << std::endl;
}
void testonetype(int bits)
{
switch (bits) {
case 16:
test<std::int16_t>();
test<std::uint16_t>();
break;
case 32:
test<std::int32_t>();
test<std::uint32_t>();
break;
}
}
int main([[maybe_unused]] int argc, [[maybe_unused]] char* argv[])
{
testonetype(16);
testonetype(32);
}
|
