can 0 be used as sentinel value for pointers to members ?

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3 total messages Started by Christian Millour Thu, 16 Nov 1995 16:07

#2596

Author: Christian Millour
Date: Thu, 16 Nov 1995 16:07

12 lines
970 bytes

Hi all. 

Can 0 be used as sentinel/null value for pointer-to-member data 
or functions, the way it is used for ordinary pointers ?

TIA,

--chris@etca.fr

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Re: can 0 be used as sentinel value for pointe

#2600

Author: Steve Clamage
Date: Fri, 17 Nov 1995 01:05

20 lines
1053 bytes

In article lhe@etca.etca.fr, chris@etca.fr (Christian Millour) writes:
>
>Can 0 be used as sentinel/null value for pointer-to-member data 
>or functions, the way it is used for ordinary pointers ?

Yes.

A constant integral zero serves as a null pointer-to-member just as it
serves as a null data pointer or function pointer.

---
Steve Clamage, stephen.clamage@eng.sun.com



---
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Re: can 0 be used as sentinel value for pointers to members ?

#2622

Author: J. Kanze
Date: Sat, 18 Nov 1995 03:14

17 lines
1372 bytes

Christian Millour (chris@etca.fr) wrote:
|> Hi all. 

|> Can 0 be used as sentinel/null value for pointer-to-member data 
|> or functions, the way it is used for ordinary pointers ?

Yes.  It is guaranteed that no valid pointer to member will ever compare
equal to 0.
-- 
James Kanze           (+33) 88 14 49 00          email: kanze@gabi-soft.fr
GABI Software, Sarl., 8 rue des Francs Bourgeois, 67000 Strasbourg, France
Conseils, itudes et rialisations en logiciel orienti objet --
              -- A la recherche d'une activiti dans une region francophone
---
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