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Date: Mon, 08 Dec 2003 13:36:03 -0600
From: Chad Bremmon <bremmon@acm.org>
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Newsgroups: comp.lang.ada
Subject: Re: Question about OO programming in Ada
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Date: 2003-12-08T13:36:03-06:00
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Georg Bauhaus wrote:

> What difference does your compiler produce from the following two
> files?
> 
> testX.cc:
> 
> struct X { int a; };
> 
> testY.cc:
> 
> class Y {public: int a;};

The overhead that I'm referring to doesn't come into play until you call 
a function on a class

The way object oriented programming works, is there is an implicit 
parameter always passed to any function of a C++ class.

It is done explicitly in Ada 95, usually with a this paramter.

Obviously there is no runtime overhead with a declaration, because there 
are no instructions associated with a declaration.  The calls to class 
functions usually involve runtime dispatching in a C++ class, they very 
seldom require dispatching in an Ada95 class.

But, if you're going to just write declarations, there is no overhead, 
becuase it doesn't do anything either way.