Function template return type deduction

Question

I have some class C with const and non-const getters for some generic type Node:

template 

        

Answer 1

Define a simple helper trait, which will add/remove const from a type based on whether another type is const:

template 
using copy_const = typename std::conditional<
  std::is_const::value,
  const Dst,
  typename std::remove_const::type
>::type;

And use it:

template 
copy_const& AliasGetNode(CType* cobject);