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#if !defined Already_Included_Collection
#define Already_Included_Collection
namespace omega {
template<class T> class Iterator;
template<class T> class Any_Iterator;
//! protocol for any kind of collection
template<class T> class Collection {
public:
virtual Iterator<T> *new_iterator() = 0;
virtual Any_Iterator<T> any_iterator() { return Any_Iterator<T>(new_iterator()); }
virtual int size() const = 0;
};
/*!
* protocol for collections whose elements are ordered
* by the way they are entered into the collection, and
* whose elements can be accessed by "index"
*
* note that the implementation need not be a linked list
*/
template<class T> class Sequence : public Collection<T> {
public:
virtual const T &operator[](int) const = 0;
virtual T &operator[](int) = 0;
/*! Y in X --> X[X.index(Y)] == Y */
virtual int index(const T &) const = 0; };
} // namespace
#define instantiate_Collection(T) template class Collection<T>; \
instantiate_Any_Iterator(T)
#define instantiate_Sequence(T) template class Sequence<T>; \
instantiate_Collection(T)
#endif
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