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Re: Running initial code when in library


From: Paulo Matos
Subject: Re: Running initial code when in library
Date: 25 May 2006 02:29:46 -0700
User-agent: G2/0.2

Paul Pluzhnikov wrote:
> "Paulo Matos" <address@hidden> writes:
>
> > Isn't this a normal
> > problem: an interface with some libraries using the interface. The core
> > creates and destroys the object of the libraries through the interface.
>
> No, I don't believe this is a widely-used design pattern,
> at least not with static linking.
>

OK, I may agree with you on this.

> > This seems a normal issue which turns out to be a nightmare
> > to solve. :-/
>
> Firstly, your nightmare is entirely of your own doing.
>

Why is it of my doing? Because I'm trying a design pattern which is not
so common after all?

> Secondly, it has trivial solutions.
> One I already mentioned: listing objects explicitly.
>
> Here is another:
> - rename your "registration" objects such that their names are
>   unique, e.g. instead of "proxy p;" say
>
>   proxy p_libbf; // in libbf.a
>   proxy p_libot; // in libot.a
>   // etc.
>
>
> - into your main.o add this:
>
>   #ifdef PULL_LIBBF
>   extern proxy p_libbf;
>   proxy &p_libbf_ref = p_libbf;
>   #endif
>   // etc.
>
> - now you can control what is pulled into the static link:
>
>   g++ -DPULL_LIBBF main.cc -c
>
> - link just the way you do now, and the object(s) that you need
>   from libbf.a will be pulled in into the main exe, because p_libbf
>   is now on the "needed" list.
>

This seems a nice solution. I'll only be able to try this later. Thanks
a lot for you help, comments and suggestions. I do appreciate them. :-)

Cheers,

Paulo Matos

> Cheers,
> --
> In order to understand recursion you must first understand recursion.
> Remove /-nsp/ for email.



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