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

Something like this should work:

#include 

You just need to add a single line to the factories list for each class.

If you are using an enum with contiguous values starting from 0 then you can just use an array rather than a std::map, e.g:

enum class Class
{
    a,
    b
};

Factory factories[] =
{
    []( void* data, int size ){ return std::make_unique( data, size ); },
    []( void* data, int size ){ return std::make_unique( data, size ); }
};
Class input = Class::a;
factories[static_cast(input)]( data, size )->Something();