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From: Wendell P Beckwith <wbeckwit@rsa.hisd.harris.com>
Subject: Help with ADA and C function pointers.
Date: 1996/11/20
Message-ID: <32937F73.65A8@rsa.hisd.harris.com>#1/1
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organization: Harris Electronic System Sector
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newsgroups: comp.lang.ada
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Date: 1996-11-20T00:00:00+00:00
List-Id: <comp.lang.ada>


I have an ada main procedure which needs to pass the address of an ada
function to a C funciton.  Using gnat 3.05 the following compiles and
generates an executable, but it cores when you run it.  I knew it would
because no where am I assigning a function to be passed.  That is what
I'd like to know how to do.  Please respond to my work email, since I'm
not in this group alot.  Thanks!!

Wendell

-- my test main
with Text_IO, Interfaces.C; 
use Text_IO;

Procedure Gmain is

	Function func(d : in Integer) return Integer is
	Begin
		return (2 * d);
	End;
	type func_type is access Function(d : in Integer) return Integer;
	funcptr : func_type;
	
	Procedure Stuff(f : in func_type);
	pragma Import(C, Stuff, "stuff");
	
Begin
	Stuff(funcptr);
End;

-- my test C function using the ada callback
#include <stdio.h>

void stuff(int (*function)(int))
{
	printf("Value = %d\n", (*function)(10));
}