classdesc::Poly< T, Base > Struct Template Reference

#include <polyBase.h>

Inheritance diagram for classdesc::Poly< T, Base >:

Collaboration diagram for classdesc::Poly< T, Base >:

Public Member Functions
Poly *	clone () const
	clone has to return a Poly* to satisfy covariance

Detailed Description

template<class T, class Base>
struct classdesc::Poly< T, Base >

utility class for building the derived types in a polymorphic heirarchy. Base is the base of the heirarchy. A possible use is as follows:

class MyBase: public PolyBase<int> { static MyBase* create(int); // factory method };

template <int t>=""> class MyClass: public Poly<MyClass, MyBase> { public: int type() const {return t;} };

see also Factory class for another way of doing this static MyBase* MyBase::create(int t) { switch (t) { case 0: return new MyClass<0>; case 1: return new MyClass<1>; case 2: return new MyClass<2>; default: throw std::runtime_error("unknown class construction requested"); } }

See also descriptor specific poly classes, such as polypack.h

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The documentation for this struct was generated from the following file:

• include/polyBase.h