如何对非ascii字符使用tolower函数

Question

I am trying to apply lower function on non-ASCII characters. Following code doesn't work in Linux(Ubuntu) environment but works in windows.

int main() {
        std:string data="ŽŠ";
        std::transform(data.begin(), data.end(), data.begin(), ::tolower);
        cout<< data << endl;
        return 0;
}

I tried installing language packs but did not work.Can someone help me what am i missing in this code?

Answer 1

::tolower() relies in the current locale set in the C library. The default "C" locale is only guaranteed to handle ASCII characters. Microsoft is likely using a different default locale that matches the user's current locale. That would explain why the code is able to work on Windows.

Use ::setlocale() to set the desired locale for ::tolower() to use. Otherwise, use a portable Unicode library, such as ICU .