Hole of new? (Re: Array of array)
schveiguy at yahoo.com
Sat Jan 7 11:00:28 PST 2012
On Sat, 07 Jan 2012 13:29:25 -0500, bearophile <bearophileHUGS at lycos.com>
> Steven Schveighoffer:
>> Interesting trivia, the compiler actually transforms the following:
>> struct S
>> int x;
>> auto s = new S;
>> into this:
>> auto s = (new S).ptr;
>> Found that out when revamping the array allocation code. It's one thing
>> that still bugs me because this means s will be initialized as an
>> appendable array when it doesn't have to be.
> What are the disadvantages caused by this?
Wasted space. An appendable array requires extra space at the end of the
block to store the 'used' length.
> If the disadvantages are significant is this improvement in Bugzilla as
> enhancement request?
It's not in bugzilla, but it's strictly a performance thing, I don't think
the current method causes any harm, it's just not as optimal as it could
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