From: "Anthony Liguori" <[EMAIL PROTECTED]>
[...]
> So I wrote up a class that provided virtual constructor functionality.
> It actually allows for types to be treated as objects including storing
> types in any STL container. This allows for really advanced factory
> algorithms and all sorts of fun stuff. The basic usage is as follows:
>
> struct A
> {
> A(int a);
> };
>
> struct B : public A
> {
> B(int a);
> };
>
> typedef factory<A, int> FactoryA;
typedef function<A* (int)> FactoryA;
> FactoryA b = FactoryA::create<B>();
template<class T> struct constructor
{
template<class A1> T * operator()(A1 const & a1)
{
return new T(a1);
}
};
FactoryA b = constructor<B>();
> FactoryA c;
>
> A *a = b(10); // Returns new B(10)
> c = b;
> delete a;
> a = c(15); // Returns new B(10)
;-)
Change 'T*' to auto_ptr<T> or shared_ptr<T> according to taste.
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