Jun 29, 2018 · 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?

Jan 9, 2010 · A functor is a function which maps objects and morphisms from one category to objects and morphisms in another. Least that's how I understand it. What that means exactly …

For one, the functor can contain internal state; a state that is valid for this invocation of the function object only. You could add static variables to your function, but those would be used …

Sep 24, 2023 · In sum, the question is whether or not to mean functor as a property of couples of functions or as to couple of functions with built-in domain and codomain (which are …

Aug 28, 2011 · A functor that is Applicative but not a Monad because laws cannot be satisfied even though the type signature of bind can be implemented. This example has generated …

Moreover, the functor mappings preserve function composition over the functions on arguments and values. Briefly, functions map element while Functors map systems (=elements+functions …

Jun 2, 2009 · c++ functor and function templates Asked 16 years, 4 months ago Modified 16 years, 4 months ago Viewed 28k times

Jan 13, 2011 · I wonder where should we use lambda expression over functor in C++. To me, these two techniques are basically the same, even functor is more elegant and cleaner than …

Dec 3, 2009 · A C callback function written in C++ must be declared as an extern "C" function - so using a functor directly is out. You'll need to write some sort of wrapper function to use as that …

Sep 10, 2011 · Functors With a Functor. A Functor is basically a Lambda, but one that is wrapped in an object. While functions cannot be passed into other functions as parameters, objects …