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Re: how does /no_copy work??? [message #15724 is a reply to message #15651]

Thu, 03 June 1999 00:00

John Persing
Messages: 4
Registered: June 1999

Junior Member

Peter Mason <menakkis@my-deja.com> wrote in message
news:7j5a1n$8d1$1@nnrp1.deja.com...
> Further to what David has written, there is a way to capture the
> "spirit" of NO_COPY, in general - wherever there's some kind of
> assignment going on. Use the TEMPORARY() function. e.g., If you do
> A=B then A is set up with a copy of B's stuff (B is left intact). If
> you do A=TEMPORARY(B) then B's stuff is essentially "switched over" to A
> (B is deleted).
> This technique is only worthwhile in cases where the amount of data
> concerned is *large* (e.g., large arrays), or in cases where the amount
> of data is not insignificant and the operation is done very frequently.

But let me ask, how can this be possible when deal with a variable that
"starts" on the stack and "ends up" on the heap? If B is an ordinary array
and A is property of an object, then this is what will occur. The heap and
stack are entirely different memory locations.

It seems that what you say will be slick if B is a pointer to an array, then
the assignment to the object will be fast. Of course, there is hardly the
need for TEMPORARY for such a small assignment.

--
}3 John Persing }3
http://www.frii.com/~persing persing@frii.com
Half of all Americans earn less than the median income!!!!!!

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[Message index]

		how does /no_copy work??? By: D. Mattes on Wed, 02 June 1999 00:00
		Re: how does /no_copy work??? By: davidf on Fri, 04 June 1999 00:00
		Re: how does /no_copy work??? By: steinhh on Fri, 04 June 1999 00:00
		Re: how does /no_copy work??? By: davidf on Thu, 03 June 1999 00:00
		Re: how does /no_copy work??? By: John Persing on Thu, 03 June 1999 00:00

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