Case insensitive std::set of strings

Question

How do you have a case insensitive insertion Or search of a string in std::set?

For example-

std::set s;
s.insert(\"Hello\");
s.in         


        

Answer 1

You need to define a custom comparator:

struct InsensitiveCompare { 
    bool operator() (const std::string& a, const std::string& b) const {
        return strcasecmp(a.c_str(), b.c_str()) < 0;
    }
};

std::set s;

You may try stricmp or strcoll if strcasecmp is not available.