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#include "fast_float/fast_float.h"
#include <cassert>
#include <cmath>
#include <cstdio>
#include <ios>
#include <iostream>
#include <system_error>
template <typename T> char *to_string(T d, char *buffer) {
auto written = std::snprintf(buffer, 128, "%.*e", 64, d);
return buffer + written;
}
void allvalues() {
char buffer[128];
for (uint64_t w = 0; w <= 0xFFFFFFFF; w++) {
float v;
if ((w % 1048576) == 0) {
std::cout << ".";
std::cout.flush();
}
uint32_t word = uint32_t(w);
memcpy(&v, &word, sizeof(v));
{
char const *string_end = to_string(v, buffer);
float 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 << buffer << std::endl;
std::cerr << "I got " << std::hexfloat << result_value
<< " but I was expecting " << v << std::endl;
abort();
} else if (result_value != v) {
std::cerr << "no match ? " << buffer << " got " << result_value
<< " expected " << v << 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() {
allvalues();
std::cout << std::endl;
std::cout << "all ok" << std::endl;
return EXIT_SUCCESS;
}
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