The MDesCArray mixin class

The MDesCArray class is a mixin which defines a protocol for:

• returning the number of elements in a descriptor array

• returning a non-modifiable pointer descriptor, a TPtrC type representing a specific indexed element.

The use of the mixin permits a degree of polymorphism amongst the descriptor array classes. It permits the number of descriptor array elements to be returned and a TPtrC type for a specific descriptor array element to be returned without knowing the specific concrete descriptor array type being accessed.