While explaining to someone what a type class X is I struggle to find good examples of data structures which are exactly X. So, I request examples for: A type constructor which is not a Functor. A type constructor which is a Functor, but not Applicative. A type constructor which is an Applicative, but is … Read more
I’ve come across the term ‘Functor’ a few times while reading various articles on functional programming, but the authors typically assume the reader already understands the term. Looking around on the web has provided either excessively technical descriptions (see the Wikipedia article) or incredibly vague descriptions (see the section on Functors at this ocaml-tutorial website). … Read more
I’m looking for the rules involving passing C++ templates functions as arguments. This is supported by C++ as shown by an example here: #include <iostream> void add1(int &v) { v+=1; } void add2(int &v) { v+=2; } template <void (*T)(int &)> void doOperation() { int temp=0; T(temp); std::cout << “Result is ” << temp << … Read more
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? 14 s 14 A functor is pretty much just a class which defines the operator(). That lets you create objects which “look like” a function: // this … Read more
