C++ how to replace constructor switch?

Question

I would like to replace big switch with something more elegant.

class Base
{
public:
  Base(void*data, int size);
  virtu         


        

Answer 1

If the constructors are exactly the same and Something methods are called similarly then you should be able to use templates like this:

template
void DoSomething(void*data, int size){
    T t(data, size);
    t.Something();
}
..
{
    switch(input){
        case 'a': DoSomething(..); break;
        case 'b': DoSomething(..); break;
    }
}

you can use is_base_of if you want to validate that the template is a derived class of Base.

Since you switch on an unknown variable (in this case a char) I'm not sure how you would minimize the switch, unless following the pattern suggested by Alan Birtles.