Re: [boost] [xint] Third release is ready, requesting preliminary review

Subject: Re: [boost] [xint] Third release is ready, requesting preliminary review
From: Chad Nelson (chad.thecomfychair_at_[hidden])
Date: 2010-05-03 12:13:39

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On 05/03/2010 08:28 AM, Stewart, Robert wrote:

>> But, you save the cost of copying a large object. COW has many
>> disadvantages, but how can you claim it is slower when you require
>> a copy?
> 
> Did you miss the "but then need to modify it/them" part?  The only
> reason for the copy was to have a mutable copy.  Thus, the COW
> overhead was useless in that example.

Not exactly useless -- I *do* know enough to avoid things that are
completely useless. :-) The purpose was to initialize them to the value
of another integer, such as a parameter, before going into a loop that
modifies them based on their current values. With copy-on-write, the
initial allocation can be skipped, which (depending on the number of
times it needs to loop) can be a significant savings.
- -- 
Chad Nelson
Oak Circle Software, Inc.
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