On Saturday, 1 August 2020 at 16:04:01 UTC, Steven Schveighoffer wrote:
> On 7/31/20 12:32 PM, wjoe wrote:
>> On Friday, 31 July 2020 at 04:28:57 UTC, Ali Çehreli wrote:
>>> Another option, which is curiously said to be more performant in memory allocation than native arrays, is std.array.Appender. I've used function-local static Appenders to cut down on memory allocation. Here is an uncompiled pseudo code:
>>>
>>> [...]
>> 
>> This looks like an even better way to do it.
>> 
>> Thanks, Ali :)
>
> Just FYI, the reason this is faster is because there is no need to go through the opaque calls into druntime to figure out if appending-in-place is possible. The reserved length is stored directly in the struct.
>
> -Steve

That's good to know, thanks :)
By the looks of it, Appender is half duplicating the runtime :)