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From: tneff@bfmny0.UUCP (Tom Neff)
Newsgroups: comp.std.c
Subject: Re: Question about function pointers & prototypes
Message-ID: <14594@bfmny0.UUCP>
Date: 26 Aug 89 16:28:18 GMT
References: <1611@agora.UUCP>
Reply-To: tneff@bfmny0.UU.NET (Tom Neff)
Organization: ^
Lines: 18

In article <1611@agora.UUCP> rickc@agora.UUCP (Rick Coates) writes:
>I am using an array of pointers to functions to access procedures.  My
>compiler complains about lacking a function prototype.  Since the 
>procedures take from none to four differing parameters, how do I declare it?

If the list of function pointers is such that the Nth entry is always
a function of a certain declaration, while the N+1th is always a function
of a certain OTHER declaration, etc., then it is probably better to use
a structure here than an array.  The structure declaration will let you
provide explicit prototypes for the component function (pointers).  If
one or more entries in the list really do take a variable number of
parameters, then the standard pANS "varargs" can be used in their
declaration within the structure.

This is a standard solution for installable drivers and the like.
-- 
"We walked on the moon --	((	Tom Neff
	you be polite"		 )) 	tneff@bfmny0.UU.NET