mirror of
https://github.com/fastfloat/fast_float.git
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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.
77 lines
2.0 KiB
C++
77 lines
2.0 KiB
C++
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#include "fast_float/fast_float.h"
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#include <cassert>
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#include <cmath>
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#include <cstdio>
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#include <ios>
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#include <iostream>
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#include <limits>
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#include <string>
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#include <system_error>
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template <typename T> char *to_string(T d, char *buffer) {
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auto written = std::snprintf(buffer, 64, "%.*e",
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std::numeric_limits<T>::max_digits10 - 1, d);
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return buffer + written;
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}
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bool basic_test_64bit(std::string vals, double val) {
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double result_value;
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auto result = fast_float::from_chars(vals.data(), vals.data() + vals.size(),
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result_value);
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if (result.ec != std::errc() && result.ec != std::errc::result_out_of_range) {
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std::cerr << " I could not parse " << vals << std::endl;
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return false;
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}
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if (std::isnan(val)) {
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if (!std::isnan(result_value)) {
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std::cerr << vals << std::endl;
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std::cerr << "not nan" << result_value << std::endl;
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return false;
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}
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} else if (copysign(1, result_value) != copysign(1, val)) {
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std::cerr << "I got " << std::hexfloat << result_value
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<< " but I was expecting " << val << std::endl;
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return false;
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} else if (result_value != val) {
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std::cerr << vals << std::endl;
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std::cerr << "I got " << std::hexfloat << result_value
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<< " but I was expecting " << val << std::endl;
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std::cerr << std::dec;
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std::cerr << "string: " << vals << std::endl;
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return false;
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}
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return true;
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}
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void all_32bit_values() {
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char buffer[64];
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for (uint64_t w = 0; w <= 0xFFFFFFFF; w++) {
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float v32;
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if ((w % 1048576) == 0) {
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std::cout << ".";
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std::cout.flush();
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}
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uint32_t word = uint32_t(w);
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memcpy(&v32, &word, sizeof(v32));
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double v = v32;
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{
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char const *string_end = to_string(v, buffer);
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std::string s(buffer, size_t(string_end - buffer));
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if (!basic_test_64bit(s, v)) {
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return;
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}
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}
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}
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std::cout << std::endl;
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}
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int main() {
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all_32bit_values();
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std::cout << std::endl;
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std::cout << "all ok" << std::endl;
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return EXIT_SUCCESS;
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}
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