Convert a String In C++ To Upper Case

Question

How could one convert a string to upper case. The examples I have found from googling only have to deal with chars.

Answer 1

std::string str = "STriNg oF mIxID CasE lETteRS"

C++ 11

• Using for_each

  std::for_each(str.begin(), str.end(), [](char & c){ c = ::toupper(c); });

• Using transform

  std::transform(str.begin(), str.end(), str.begin(), ::toupper);

C++ (Winodws Only)

_strupr_s(str, str.length());

C++ (Using Boost Library)

boost::to_upper_copy(str)