Reply-To:	<arfa AT clara DOT net>
From:	"Arthur" <arfa AT clara DOT net>
To:	"DJGPP Mailing List" <djgpp AT delorie DOT com>
Subject:	RE: help please
Date:	Fri, 18 Sep 1998 16:37:13 +0100
Message-ID:	<001701bde31a$34d6f740$eb4d08c3@arthur>
MIME-Version:	1.0
In-Reply-To:	<19980918000252.26170.00000996@ng136.aol.com>
Importance:	Normal

> >What does UNDEFINED REFERENCE mean and how do I fix it?
>
> This is a linker error.  It comes about when a reference in a
> particular module
> is present, and its definition is expected to exist in another
> module but isn't
> found during the linking.  For example,
>
> struct X {
>   void y();
> };
>
> void f() {
> X *x;
> x -> y();
> }
>
> will compile because the definition of X::y doesn't have to be in the same
> module as the declaration of X.  The solution is to be sure that
> a file with
> the definition of X::y is linked into the executable.  This file
> should have,
>
> void X::y() {...}
>
> in it.  Or, you can just put this into the same file that references the
> function, somewhere after the declaration and somewhere before
> the reference.

Note that the above only works for C++.


James Arthur
jaa AT arfa DOT clara DOT net
ICQ#15054819

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