On Thursday, 14 August 2014 at 17:16:42 UTC, Philippe Sigaud
wrote:
From time to time, I try to speed up some array-heavy code by
using std.array.Appender, reserving some capacity and so on.
It never works. Never. It gives me executables that are maybe
30-50% slower than bog-standard array code.
I don't do anything fancy: I just replace the types, use
clear() instead of = null...
Do people here get good results from Appender? And if yes, how
are you using it?
I don't know much about Phobos appender implementation details
but the key thing with reusable buffer is avoid freeing them.
AFAIR Appender.clear frees the allocated memory but
`Appender.length = 0` does not, making it possible to just
overwrite stuff again and again.
Won't promise you anything though!
