The dreaded question

[Phlip]

Re: The dreaded question

caustik wrote:
[color=blue]
> I don't care if its bad C++, I really dont. I need to convert from
> a member function pointer to a "void*" with zero computational
> overhead.[/color]

Why?

Answering why might lead us to a suggestion that's good for your code.

(BTW the answer is: put the member function pointer into a structure, take
the address of the structure, and cast away. Good luck not crashing.)

--
Phlip

http://www.c2.com/cgi/wiki?TestFirstUserInterfaces

[Ron Natalie]

Re: The dreaded question


"caustik" <caustik@nospam .com> wrote in message news:bdvnpi$hg8 $1@eeyore.INS.c wru.edu...[color=blue]
> P.S. This works *Pefectly* (on my x86/win32 system, which is all i'm
> targetting) :
>[/color]
How can it work perfectly? On VC++ the sizeof(MPT) is some where
between 2 and 4 times the sizeof (void*)?

[Steve Coleman]

Re: Troll Alert: The dreaded question

E. Robert Tisdale wrote:
[color=blue]
> I was simply expressing my opinion.
> I look for the typical signs:
>
> 1. a troll handle
> caustik,
> 2. a forged or disposable email account
> nospam.com,[/color]

Well, they can try to anyway... ;-)

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NNTP-Posting-User: acr10@sandiego. divxnetworks.co m

In answer to the actual question...

If performance is so much of an issue that it becomes socially
acceptable to insult those that might try to help (even before asking
the question), then what's wrong with just coding an ASM var push/pop or
register move and be done with it? *That* will convert most anything! ..
and also ignore all language usage restrictions (aka. protections) in
the process. IMHO one beauty in the C++ language is that it _has_ these
restrictions, and all for good reason! To prevent someone from abusing
the usage of known types in a manner which is undefined or incorrect.

On the other hand my glass is always half full, and given the latest
description of the problem from the original poster perhaps we should
discuss the correct manner to address his issues rather than getting so
wrapped up in the emotionally charged aspects of it. Do we have enough
to go on for a C++ design discussion here? Can anyone out there suggest
a *better solution*[tm] USING the C++ language instead of trying to
fight against it(e.g. unions of pointers)? I'm sure that others out
there who are learning C++ might benefit from a discussion of C++ design
rather than a food fight (lol).

[Default User]

Re: The dreaded question



Alexander Terekhov wrote:[color=blue]
>
> Default User wrote:
> [...][color=green]
> > Yeah . . . I going to need you to go into my killfile. Yeah . . . move
> > all the way to the back. Thanks, that'll be great.[/color]
>
> I'm just curious: how BIG is your killfile?[/color]

Don't worry Al, there's a place for you if you really need it.



Brian Rodenborn

[Default User]

Re: Troll Alert: The dreaded question



"E. Robert Tisdale" wrote:
[color=blue]
> There is seldom a good reason why a legitimate post
> to a technical newsgroup like comp.lang.c++
> should evoke a strong emotional response in any subscriber.
> If it does, you should suspect a troll.[/color]


Well, I feel that way about many of your posts, especially on
comp.lang.c.




Brian Rodenborn

[Alexander Terekhov]

Re: The dreaded question


Default User wrote:[color=blue]
>
> Alexander Terekhov wrote:[color=green]
> >
> > Default User wrote:
> > [...][color=darkred]
> > > Yeah . . . I going to need you to go into my killfile. Yeah . . . move
> > > all the way to the back. Thanks, that'll be great.[/color]
> >
> > I'm just curious: how BIG is your killfile?[/color]
>
> Don't worry Al, there's a place for you if you really need it.[/color]

For free?

regards,
alexander.

[Jeff Rosenfeld]

Re: The dreaded question

template <class T> inline void* MFPtoFP (T p) { return
reinterpret_cas t<void*>(p); }

or maybe even do away with type-foo like so:

#define MFPtoFP(p) reinterpret_cas t<void*>(p)

or some such variant seems to be what you want. Just make sure only to
instantiate it with pointer types. You could be losing information, though,
because pointers to member functions (or even to normal functions) can be
larger than pointers to data.

- Jeff.

"caustik" <caustik@nospam .com> wrote in message
news:bdvl9r$cgp $1@eeyore.INS.c wru.edu...[color=blue]
> I don't care if its bad C++, I really dont. I need to convert from
> a member function pointer to a "void*" with zero computational
> overhead.
>
> I have the perfect way to do it right here, but i'm having troubles
> because if the member function pointer i pass to the function is
> not void with no params, I get a casting error.
>
> Any ideas how to do this?
>
> caustik
>
> // *************** *************** *************** *************** ******
> // * Take THIS C++ !!
> // *************** *************** *************** *************** ******
> template <class BaseClass> inline void *MFPtoFP( void
> (BaseClass::*pM emFunc)(void) )
> {
> union
> {
> void BaseClass::*pMe mFunc;
> void *pFunc();
> }
> ThisConv;
>
> ThisConv.pFunc = pMemFunc;
>
> return ThisConv.pFunc;
> }
>
>[/color]

[Alexander Terekhov]

Re: The dreaded question


Default User wrote:[color=blue]
>
> Alexander Terekhov wrote:[color=green]
> >
> > Default User wrote:[/color]
>[color=green][color=darkred]
> > > Don't worry Al, there's a place for you if you really need it.[/color]
> >
> > For free?[/color]
>
> I didn't charge you for the cheese, did I?[/color]

Cheese? I had to pay for garbage recycling.

regards,
alexander.

[Mike Wahler]

Re: Troll Alert: The dreaded question


E. Robert Tisdale <E.Robert.Tisda le@jpl.nasa.gov > wrote in message
news:3F036A8C.3 030306@jpl.nasa .gov...[color=blue]
> Something that calls itself caustik wrote:
>[color=green]
> > I don't care if its bad C++, I really don't. I need to convert from
> > a member function pointer to a "void*" with zero computational
> > overhead.
> >[/color][/color]

[color=blue][color=green]
> > I have the perfect way to do it[/color][/color]
^^^^^

right here, but I'm having troubles
^^^^^^^
[color=blue][color=green]
> > because if the member function pointer i pass to the function is
> > not void with no params, I get a casting error.[/color][/color]

Then is your way really 'perfect' after all?
[color=blue][color=green]
> >
> > Any ideas how to do this?[/color][/color]

How about your 'perfect' way?

-Mike

[Alexander Terekhov]

Re: Troll Alert: The dreaded question


Mike Wahler wrote: [...]

Whaler, you did it much better last year. Gee, that was fun...
can we do this again?

http://google.com/groups?selm=ag217d%245h7%241%40slb3.atl.mindspring.net

**********
Just a quick note to wish all my American friends and
acquaintances here a happy, safe Independence Day.

Between the festivites, fireworks, backyard barbeques, etc.,,
please take a moment to acknowledge the extraordinary integrity,
courage, and achievements of those who risked and gave their
lives so long ago in order to enable us to live as free people.

And to those of you from other various places around
the globe, a pleasant day and a happy, prosperous life
to you as well.

It's an honor and a pleasure to know and interact with
all of you.

-Mike

"I have never been able to conceive how any rational being could
propose happiness to himself from the exercise of power over
others." --Thomas Jefferson to A. L. C. Destutt de Tracy, 1811
**********

regards,
alexander.

P.S. Go and celebrate, chap. Don't waste your time here.

[Default User]

Re: The dreaded question



Alexander Terekhov wrote:[color=blue]
>
> Default User wrote:[/color]
[color=blue][color=green]
> > I didn't charge you for the cheese, did I?[/color]
>
> Cheese? I had to pay for garbage recycling.[/color]


What?! That was the finest genetically engineered Merican cheese food
substitute. All you had to do was unwrap it and place it on the ground,
it would have dissolved a tunnel straight down at least 500 feet (that's
like 29657.222 kizzometrics or whatever weird measurements you use over
there). No disposal costs were required at all.

You don't know much about cheese.




Brian Rodenborn

[Alexander Terekhov]

Re: The dreaded question


Default User wrote:[color=blue]
>
> Alexander Terekhov wrote:[color=green]
> >
> > Default User wrote:[/color]
>[color=green][color=darkred]
> > > I didn't charge you for the cheese, did I?[/color]
> >
> > Cheese? I had to pay for garbage recycling.[/color]
>
> What?! That was the finest genetically engineered Merican cheese food
> substitute. All you had to do was unwrap it and place it on the ground,
> it would have dissolved a tunnel straight down at least 500 feet (that's
> like 29657.222 kizzometrics or whatever weird measurements you use over
> there). No disposal costs were required at all.
>
> You don't know much about cheese.[/color]

I don't pretend to know much about it. I've just heard that
cheese was invented by a wandering slave who was carrying
milk across the Great American Desert in a saddlebag made
from an Alligator's stomach. American product.

regards,
alexander.

[JustBoo@BooHoo.gone]

Re: The dreaded question

On Mon, 7 Jul 2003 16:29:01 -0400, "Marduk"
<guill.lmNOSPAM @sympatico.ca> wrote:
[color=blue]
>Yup, the same guy invented fire in the early 1920's[/color]

Al Gore was alive and walking then?



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[Bren]

Re: The dreaded question

>>Yup, the same guy invented fire in the early 1920's[color=blue]
>
>Al Gore was alive and walking then?[/color]

Oh yah. But these days he's just walking.


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