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#include "fast_float/fast_float.h"
#include <iostream>
#include <string>
#include <system_error>
bool tester(std::string s, double expected,
fast_float::chars_format fmt = fast_float::chars_format::general) {
std::wstring input(s.begin(), s.end());
double result;
auto answer = fast_float::from_chars(
input.data(), input.data() + input.size(), result, fmt);
if (answer.ec != std::errc()) {
std::cerr << "parsing of \"" << s << "\" should succeed\n";
return false;
}
if (result != expected && !(std::isnan(result) && std::isnan(expected))) {
std::cerr << "parsing of \"" << s << "\" succeeded, expected " << expected
<< " got " << result << "\n";
return false;
}
input[0] += 256;
answer = fast_float::from_chars(input.data(), input.data() + input.size(),
result, fmt);
if (answer.ec == std::errc()) {
std::cerr << "parsing of altered \"" << s << "\" should fail\n";
return false;
}
return true;
}
bool test_minus() { return tester("-42", -42); }
bool test_plus() {
return tester("+42", 42,
fast_float::chars_format::general |
fast_float::chars_format::allow_leading_plus);
}
bool test_space() {
return tester(" 42", 42,
fast_float::chars_format::general |
fast_float::chars_format::skip_white_space);
}
bool test_nan() {
return tester("nan", std::numeric_limits<double>::quiet_NaN());
}
int main() {
if (test_minus() && test_plus() && test_space() && test_nan()) {
std::cout << "all ok" << std::endl;
return EXIT_SUCCESS;
}
std::cout << "test failure" << std::endl;
return EXIT_FAILURE;
}
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