On Thursday, 31 October 2013 at 09:15:53 UTC, Namespace wrote:
I'm sure we had already this conversation but I don't find the
thread.
T[] buffer = new T[N]; assumes more space than stated (in
average 2010 elements more. See:
http://dpaste.dzfl.pl/af92ad22c). It behaves exactly like
reserve and that is IMO wrong. If I reserve memory with
buffer.reserve(N), I want to have at least N elements. That
behaviour is correct. But if I use new T[N] I mostly want
exactly N elements and no extra space.
Thoughts?
To me it looks like it is derived directly from the way the GC
allocates chunks:
Next power of two if less than 4096 otherwise some multiple of
4096.
Unless you modify the GC, this behaviour is present whether you
can see it or not (http://dpaste.dzfl.pl/5481ffc2 .)
