Avoid switching on template parameters

Question

Simplified I have the following class hierarchy:

class BaseVec {
  public:
    BaseVec() {};
    virtual ~BaseVec() {};

    virtual double get_double(int i) con         


        

Answer 1

Why not change foo_template to be:

template
double foo_template(Vec*) {
  // use v which involves calling get
  return result;
}

and foo to be:

template
double foo (Vec* v )
{
return foo_template(v)
}

and let argument deduction do the work?

(You can probably get rid of one of the functions, but I wanted to keep is as close to the original)