mirror of
https://github.com/fastfloat/fast_float.git
synced 2025-12-06 16:56:57 +08:00
1a15c66fb9
manually checked modified files for errors, but not committing .clang-format due to the following warning: >>> Setting `QualifierAlignment` to something other than `Leave`, COULD lead to incorrect code formatting due to incorrect decisions made due to clang-formats lack of complete semantic information. As such extra care should be taken to review code changes made by the use of this option.
71 lines
2.1 KiB
C++
71 lines
2.1 KiB
C++
#include "fast_float/fast_float.h"
|
|
|
|
#include <cassert>
|
|
#include <cmath>
|
|
#include <cstdio>
|
|
#include <ios>
|
|
#include <iostream>
|
|
|
|
template <typename T> char *to_string(T d, char *buffer) {
|
|
auto written = std::snprintf(buffer, 128, "%.*e", 64, d);
|
|
return buffer + written;
|
|
}
|
|
|
|
void all_32bit_values() {
|
|
char buffer[128];
|
|
for (uint64_t w = 0; w <= 0xFFFFFFFF; w++) {
|
|
float v32;
|
|
if ((w % 1048576) == 0) {
|
|
std::cout << ".";
|
|
std::cout.flush();
|
|
}
|
|
uint32_t word = uint32_t(w);
|
|
memcpy(&v32, &word, sizeof(v32));
|
|
double v = v32;
|
|
|
|
{
|
|
char const *string_end = to_string(v, buffer);
|
|
double result_value;
|
|
auto result = fast_float::from_chars(buffer, string_end, result_value);
|
|
// Starting with version 4.0 for fast_float, we return result_out_of_range
|
|
// if the value is either too small (too close to zero) or too large
|
|
// (effectively infinity). So std::errc::result_out_of_range is normal for
|
|
// well-formed input strings.
|
|
if (result.ec != std::errc() &&
|
|
result.ec != std::errc::result_out_of_range) {
|
|
std::cerr << "parsing error ? " << buffer << std::endl;
|
|
abort();
|
|
}
|
|
if (std::isnan(v)) {
|
|
if (!std::isnan(result_value)) {
|
|
std::cerr << "not nan" << buffer << std::endl;
|
|
abort();
|
|
}
|
|
} else if (copysign(1, result_value) != copysign(1, v)) {
|
|
std::cerr << "I got " << std::hexfloat << result_value
|
|
<< " but I was expecting " << v << std::endl;
|
|
abort();
|
|
} else if (std::isnan(v)) {
|
|
if (!std::isnan(result_value)) {
|
|
std::cerr << "not nan" << buffer << std::endl;
|
|
abort();
|
|
}
|
|
} else if (result_value != v) {
|
|
std::cerr << "no match ? " << buffer << std::endl;
|
|
std::cout << "started with " << std::hexfloat << v << std::endl;
|
|
std::cout << "got back " << std::hexfloat << result_value << std::endl;
|
|
std::cout << std::dec;
|
|
abort();
|
|
}
|
|
}
|
|
}
|
|
std::cout << std::endl;
|
|
}
|
|
|
|
int main() {
|
|
all_32bit_values();
|
|
std::cout << std::endl;
|
|
std::cout << "all ok" << std::endl;
|
|
return EXIT_SUCCESS;
|
|
}
|