visitor pattern

In two different methods.

1. Classical method.

• The classical double dispatch implimentation. Requires two virtual function calls.

2. Using lambda, std::visit and std::variant

• Tested under a contrived example, it takes more time then a typical double dispatch. Possibly because the utility provided by std library has heavy internals.
• One thing this method is better than the first method is that it does not require the visited to be under the same type hierarchy.

Compile / Run

mkdir bld

cd bld

cmake ..

make