On Friday, 15 August 2014 at 14:40:36 UTC, Philippe Sigaud wrote:
Well, I created a wrapper around a std.array.uninitializedArray call, to manage the interface I need
Make sure you don't use that if your type has elaborate construction, or assumes a certain initial state (unless you are actually emplacing your objects of course).
I thought that, having lots of concatenation in my code, that'd be a bottleneck. But it appears than pre-allocation does not give me any speed-up.
If you are using "raw GC arrays", then the "raw" append operation will, outweigh the relocation cost on extension. So pre-allocation wouldn't really help in this situation (though the use of Appender *should*)
