Zstring makeUpperCopy(const Zstring& str)
{
const size_t len = str.size();
Zstring output;
output.resize(len);
std::transform(str.begin(), str.end(), output.begin(), [](char c) {
return static_cast<char>(::toupper(static_cast<unsigned char>(c)));
}); //locale-dependent!
//result of toupper() is an unsigned char mapped to int range, so the char representation is in the last 8 bits and we need not care about signedness!
//this should work for UTF-8, too: all chars >= 128 are mapped upon themselves!
return output;
}
