C++ template to cover const and non-const method

Question

I have a problem with duplication of identical code for const and non-const versions. I can illustrate the problem with some code. Here are two s

Answer 1

Another solution - require the Visitor class to have a metafunction that adds const when it applies:

template 
static void visit(Visitor &v, typename Visitor::ApplyConst::Type &a)
{
    v(a.i);
    v(a.d);
}