Function call operator

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You can overload the function call operator ():

Overloading must be done inside of a class/struct:

//R -> Return type
//Types -> any different type
R operator()(Type name, Type2 name2, ...)
    //Do something
    //return something

//Use it like this (R is return type, a and b are variables)
R foo = object(a, b, ...);

For example:

struct Sum
    int operator()(int a, int b)
        return a + b;

//Create instance of struct
Sum sum;
int result = sum(1, 1); //result == 2

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