Function Reference

My implementation of a functionRef/functionView variant. Why? I desperately wanted to know just how std::function<> works. So I scoured the tutorials, books what have you, in order to find more information and ended up creating a sort of lightweight variant of it.

The skills you need to have under your belt before attempting this tutorial are:

1. Type erasure.
2. callable objects
3. std::invoke
4. higher order functions
5. lambda calculus - just a smattering knowledge

Based on std::function, functionRef is a non-owning wrapper for an arbitrary callable object.

Implementation notes:

• A primary template is used to match the complete type of a callable, say void( int, int ) or int. The primary template remains an empty struct.
• We want to differentiate the function type...