How to use std::find/std::find_if with a vector of custom class objects?

Question

I have a class representing a user called Nick and I want to use std::find_if on it, where I want to find if the userlist vector has an object incl

Answer 1

You can use boost::bind

std::find_if( userlist.begin(), userlist.end(),
            boost::bind( & Nick::isFound,
                         _1 ) );

just implement bool Nick::isFound()

You can also pass the criteria

std::find_if( userlist.begin(), userlist.end(),
              boost::bind( & Nick::compare,
                           _1,
                           nick ) );

implement

bool Nick::compare( const Nick & nick )
{
    return this->username == nick.username;
}