Eiffel.An advanced introduction by Snyder A.A.

By Snyder A.A.

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2 Renaming In some contexts, it may be desirable for a descendant class to inherit two features identically named f from two different classes A and B. In this case, selecting just one f from either A or B will not sufficiently enable one to acquire both versions of f. Recall that selection enables only one version of f to be inherited from any set of parents. However, we can rename one version of f to g for example, thusly resolving a name clash, if any, and enabling two versions of f to be acquired, one of which is under a different name.

That is, if a feature from PERSON depends on the occupation field, will it still be a valid feature since occupation doesn't exist anymore? Consider: class A feature x, y : INTEGER; set_x (new : INTEGER) is do x := new end; end Eiffel: An Advanced IntroductionPage 33 class C inherit A rename x as x1 end end -- C Now, if we create an instance of class C, and attempt to call the set_x routine, is this legal? The answer is yes, this is perfectly legal. The fact that x has been renamed to x1 does not affect the routine set_x (although it should be stated that set_x should be itself renamed to set_x1 for consistency on the programmer's part.

Ensure one_less_element : size = old size - 1; end --remove_leaf end -- SOME_CLASS This eliminates the need to declare an extra local variable, original_size as we had it, for the explicit purpose of temporarily storing the value of size at routine entry. An additional benefit of this keyword is the fact that it promotes readability. It is easier to read old size than go through the motions of determining exactly what original_size means. 3 Invariants Eiffel: An Advanced IntroductionPage 55 As computer scientists, we learn early how to formally specify the behavior of an algorithm.

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