function-call-operator – Make Me Engineer

Why override operator()?

June 29, 2022 by Tarik

One of the primary goal when overloading operator() is to create a functor. A functor acts just like a function, but it has the advantages that it is stateful, meaning it can keep data reflecting its state between calls. Here is a simple functor example : struct Accumulator { int counter = 0; int operator()(int … Read more

What are C++ functors and their uses?

April 19, 2022 by Tarik

A functor is pretty much just a class which defines the operator(). That lets you create objects which “look like” a function: // this is a functor struct add_x { add_x(int val) : x(val) {} // Constructor int operator()(int y) const { return x + y; } private: int x; }; // Now you can … Read more