From: Todd Hoff <tmh@possibility.com>
To: shiva@well.com
Cc: C++ Embedded <c++-embedded@cygnus.com>
Subject: Re: static function tables
Date: Mon, 29 Jun 1998 19:55:00 -0000 [thread overview]
Message-ID: <3598531C.99E95CB5@possibility.com> (raw)
In-Reply-To: <35982CA0.21E2@compuserve.com>
Ken wrote:
> The catch in this case is that the objects are static, and this is a
> memory-limited embedded system where I don't want to copy a const array
> of structures in ROM into equivalent C++ structures in RAM. This is kind
> of a general problem in using C++ in a memory-limited environment.
I would be inclined to overload the new operator and take the memory
out of a static array or some other fixed source. Best of both worlds.
In fact, in a memory constrained system i would overload the global
new and allocate memory from pools of fixed sized buffers. Works
best i think.
>There
> are cases where it would be nice to initialize static const C++ objects
> at compile or link time (on the host) rather than just before main() (on
> the target).
Some say potatoes...
> I've seen a trick lately (I think in Embedded Systems Programming) where
> one exposes a C++ class that defines an internal private struct for the
> static const data. Something like
>
> class public_class
> {
> private:
> struct static_data { ... };
> static const static_data data[]; // stored in ROM
> };
>
> This looks applicable to the situation.
This is the pimple pattern or the handle pattern. Works fine.
Just better make sure your rom address is correct!
------------------------------------------------------------------
tmh@possibility.com http://www.possibility.com/Tmh
Desperate measures require the invention of desperate times.
-- Todd Hoff
prev parent reply other threads:[~1998-06-29 19:55 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
1998-06-27 1:34 Ken
1998-06-27 8:40 ` Todd Hoff
1998-06-29 17:27 ` Ken
1998-06-29 19:55 ` Todd Hoff [this message]
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