functor
a functor, or function object, is a cl-ss in c++ with the () operator overloaded. functors are used a lot in the standard library to do custom comparisons. they’re used in place of function pointers because sometimes you need to store a value or remember something (ie. put the functor into a special ‘state’ for whatever purpose), a functor can do this, a function pointer can’t (without messing with global variables).
cl-ss over5 { // this cl-ss is the functor
bool operator() (int x) {
return x > 5;
}
};
std::list
… // put a bunch of ints onto the list
over5 o5;
std::find_if(l.begin(), l.end(), o5);
// o5 will have its overloaded () operator called to check if the element in l is over 5.
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