c++ - std::wstring length -

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what result of std::wstring.length() function, length in wchar_t(s) or length in symbols? , why?

tchar r2[3]; r2[0] = 0xd834;  // d834, dd1e - musical g clef r2[1] = 0xdd1e;  // r2[2] = 0x0000;  // '/0'  std::wstring r = r2;  std::cout << "capacity: " << r.capacity() << std::endl; std::cout << "length: "   << r.length()   << std::endl; std::cout << "size: "     << r.size()     << std::endl; std::cout << "max_size: " << r.max_size() << std::endl;  output>  capacity: 351 length: 2 size: 2 max_size: 2147483646

std::wstring::size() returns number of wide-char elements in string. not same number of characters (as correctly noticed).

unfortunately, std::basic_string template (and instantiations, such std::string , std::wstring) encoding-agnostic. in sense, template string of bytes , not string of characters.


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