1 回答
Drop the L before the string literal. Use std::string, not std::wstring.
UPD: There's a better (correct) solution. keep wchar_t, wstring and the L, and call setlocale(LC_ALL,"") in the beginning of your program.
You should call setlocale(LC_ALL,"") in the beginning of your program anyway. This instructs your program to work with your environment's locale, instead of the default "C" locale. Your environment has a UTF-8 one so everything should work.
Without calling setlocale(LC_ALL,""), the program works with UTF-8 sequences without "realizing" that they are UTF-8. If a correct UTF-8 sequence is printed on the terminal, it will be interpreted as UTF-8 and everything will look fine. That's what happens if you use string and char: gcc uses UTF-8 as a default encoding for strings, and the ostream happily prints them without applying any conversion. It thinks it has a sequence of ASCII characters.
But when you use wchar_t, everything breaks: gcc uses UTF-32, the correct re-encoding is not applied (because the locale is "C") and the output is garbage.
When you call setlocale(LC_ALL,"") the program knows it should recode UTF-32 to UTF-8, and everything is fine and dandy again.
This all assumes that we only ever want to work with UTF-8. Using arbitrary locales and encodings is beyond the scope of this answer.