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Re: [std-proposals] std::sizeof_minus_trailing_padding

From: Breno Guimarães <brenorg_at_[hidden]>
Date: Sun, 3 Dec 2023 16:19:03 -0300
It was just a joke.

By the way, the no_unique_address annotation didn't bring the concept of
overlapping objects. It already existed.


Em dom., 3 de dez. de 2023 14:55, Frederick Virchanza Gotham via
Std-Proposals <std-proposals_at_[hidden]> escreveu:

> On Sun, Dec 3, 2023 at 5:39 PM Breno Guimarães wrote:
> >
> > What if someone memsets the content of the T inside the optional using
> the size of the T?
> > Some people do that even though not always needed, but because paranoia
> is good :D
> My deliberate paranoia has saved my @$$ a few times . . . most
> likely many more times than I know about. There's probably a few
> emails that never got sent to my boss because I put some deliberate
> paranoia in the code. I mean, when programming a microcontroller to
> turn off a laser that's fed by two input pins, I set both pins low
> (even though I only need to set one of the pins low) and also set the
> pin to the MOSFET low that's providing power. Taking a belt and braces
> approach to life is beneficial most of the time unless you're doing
> extreme optimisation. Malcom In The Middle's older brother said it
> better than I ever could: "Always build redundancy into the system".
> I wasn't around in the 1970's but I probably would have invented the
> watchdog timer in tandem with the actual inventor . . . it would have
> been my style.
> Using 'memset' to bulldoze memory can be useful for debugging, and
> also for limiting the catastrophe caused by a future yet-to-be-written
> bug. It's much easier to debug the dereferencing of a nullptr than the
> dereferencing of a pointer to a block of memory that got deallocated 4
> minutes ago.
> I didn't know about the existence of no_unique_address until a few
> days ago, and so now I'll be more careful with 'memset' and 'memcpy'.
> The whole idea of 'potentially-overlapping objects' is a bit mad and I
> would imagine that a few people were hesitant to bring it into C++.
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Received on 2023-12-03 19:20:03