November 2002
Intermediate to advanced
560 pages
11h 16m
English
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Assignment Compatibility
As the concepts of object types and interface types have now been explained, albeit very simply, the question of assignment compatibility can be addressed. A simple definition of assignment compatibility for reference types is that a location of type T, where T may be either an object type or an interface type, can refer to any object:
With an exact type of T, or
That is a subtype of T, or
That supports the interface T.
Listing 2.10 demonstrates aspects of assignment compatibility. The program starts by creating values of two different types and two interface references:
A value of type System.Int32 called i
An Object reference called o
A String reference called s
An IComparable reference called ic
Listing 2.10. Assignment ...
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