This defines the internal interface for packing values into a DCField.
The various different DC objects inherit from this.
Normally these methods are called only by the DCPacker object; the user wouldn't normally call these directly.
Returns true if this interface is bitwise the same as the interface described with the indicated formatted string, e.g.
int16)", or false otherwise.
If DCFile is not NULL, it specifies the DCFile that was previously loaded, from which some predefined structs and typedefs may be referenced in the description string.