C++ Convert string (or char*) to wstring (or wchar_t*)

Question

string s = \"おはよう\";
wstring ws = FUNCTION(s, ws);

How would i assign the contents of s to ws?

Searched google and used some techniques but

Answer 1

Your question is underspecified. Strictly, that example is a syntax error. However, std::mbstowcs is probably what you're looking for.

It is a C-library function and operates on buffers, but here's an easy-to-use idiom, courtesy of TBohne (formerly Mooing Duck):

std::wstring ws(s.size(), L' '); // Overestimate number of code points.
ws.resize(std::mbstowcs(&ws[0], s.c_str(), s.size())); // Shrink to fit.