I'm trying to make Twice a member of applicative, but I am getting "Conflicting definitions for `a'" in the functor implementation: Also I'm not sure how to imp
In most language that have parametric / generic types, there is a (type) expression you can write to mean 'Set of something'. E.g. Set<Integer> in Java. S
Why does the for_each call on functor doesn't update sum::total at the end? struct sum { sum():total(0){}; int total; void operator()(int element)