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

As long as you are fine with ASCII-only and you can provide a valid pointer to RW memory, there is a simple and very effective one-liner in C:

void strtoupper(char* str)
{ 
    while (*str) *(str++) = toupper((unsigned char)*str);
}

This is especially good for simple strings like ASCII identifiers which you want to normalize into the same character-case. You can then use the buffer to construct a std:string instance.