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Article #3371

Re: typedef not strong

#3371
From: Paul D. DeRocco
Date: Tue, 20 Feb 1996 18:50
30 lines
1964 bytes
The disadvantage of "class" is that it creates a structure type. If you 
want to create a new arithmetic type, you can do that with "class", but 
you have to define all the arithmetic operators over again, using 
inlines. The Borland compiler, for one, will let you do that, but it 
will never generate code quite as efficient as it will for the built-in 
types, where it is happy to do arithmetic (addition and subtraction, at 
least) in whatever registers are most convenient.

Perhaps we need a syntax like:

	class myint: public int;
	class specialint: public myint;

so a myint could be used where an int was expected, and a specialint 
could be used where a myint was expected.

But as soon as we do that, people will want to specify valid ranges for 
the types, a la Ada, which adds another whole level of complexity.

-- 

Ciao,
Paul D. DeRocco
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Path: arc1-ca.pugleaf.net!chronicle.mti.sgi.com!austern
From: "Paul D. DeRocco" <pderocco@ix.netcom.com>
Newsgroups: comp.std.c++
Subject: Re: typedef not strong
Date: 20 Feb 1996 10:50:00 PST
Organization: Netcom
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