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From: dewar@cs.nyu.edu (Robert Dewar)
Subject: Re: How to supply pointer to C?
Date: 1996/08/28
Message-ID: <dewar.841212360@schonberg>#1/1
X-Deja-AN: 176945507
references: <85ybj1zcdu.fsf@walleroo.rp.CSIRO.AU>
 <01bb9464$de525a00$3b8371a5@dhoossr.iquest.com>
organization: Courant Institute of Mathematical Sciences
newsgroups: comp.lang.ada
Date: 1996-08-28T00:00:00+00:00
List-Id: <comp.lang.ada>


David said

"This solution is a portable (i.e. Ada83/Ada95) solution, based on the
assumption that Ada's System.ADDRESS and C's pointer are the same size, and
have identical representations, and that Ada's INTEGER type and C's size_t
type are the same size, and have identical representations.  These
assumptions are usually true."

The size_t assumption is very dangerous, it will typically NOT be true
on any 64-bit machine, for example it is false in the DEC Unix
implementation of GNAT.