In the Boost Signals library, they are overloading the () operator. Is this a convention in C++? For callbacks, etc.? I have seen this in code of a co-worker (who happens to be a big Boost fan). ...

I have a simple classifier: struct Clf { x: f64, } The classifier returns 0 if the observed value is smaller than x and 1 if bigger than x. I want to implement the call operator for this class...

I have a small "lambda expression" in the below function: int main() { int x = 10; auto lambda = [=] () { return x + 3; }; } Below is the "anonymous closure class" generated for the above lamb...

I am trying to understand some basics of C. KRC's The C Programming Language says A function call is a postfix expression, called the function designator, followed by parentheses containing a po...

I keep hearing a lot about functors in C++. Can someone give me an overview as to what they are and in what cases they would be useful?

Possible Duplicates: C++ Functors - and their uses. Why override operator() ? I've seen the use of operator() on STL containers but what is it and when do you use it?