Using template for return value. how to handle void return?

Question

I have structure for storing callback function like this:

template
struct CommandGlobal : CommandBase
{
    typedef boost::function Co         


        

Answer 1

If it's just the return statement, this should do the trick:

virtual T Execute() const
{
    if(comm)
        return comm();
    return T();
}

If there's more to it, specialize the template for void.