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From: bright@dataio.UUCP
Newsgroups: net.lang.c
Subject: Re: Casting void - int question
Message-ID: <1100@dataio.UUCP>
Date: Wed, 15-Oct-86 12:54:28 EDT
Article-I.D.: dataio.1100
Posted: Wed Oct 15 12:54:28 1986
Date-Received: Thu, 16-Oct-86 06:11:39 EDT
References: <26@orion.UUCP>
Reply-To: bright@dataio.UUCP (Walter Bright)
Organization: Data I/O - FutureNet Corp., Redmond, WA
Lines: 34

In article <26@orion.UUCP> heins@orion.UUCP (Michael T. Heins) writes:
>I have a number of existing functions with compatible arguments.  Some
>are declared as void, and others as int.  None of the return values are
>used.  I wish to set up an array of pointers to these functions.
>My problem is that the compiler complains about incompatible types, and
>I can't figure out how to use casts or unions to solve the problem.
>Re-declaring the functions is not an option.  I have exemplified the
>situation below:
>
>int fna() { }
>void fnb() { }
>
>int (*array[32])();
>main() {
>    array[0] = fna;
>    array[1] = fnb; /* This won't work as-is. */
>}
>
>I have tried things like
>	array[1] = (int (*)())fnb;
>but this generates the message "operands of CAST have incompatible types".

int fna() { }
void fnb() { }

int callfnb() { fnb(); }

int (*array[32])();
main() {
    array[0] = fna;
    array[1] = callfnb;
}

Messy, but workable.