Appender is ... slow

[Vladimir Panteleev via Digitalmars-d-learn]

On Thursday, 14 August 2014 at 18:31:15 UTC, Dicebot wrote:
> 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!

Appender has no .length property, and .clear does rewind the 
write pointer without deallocating memory, thus allowing you to 
reuse the buffer.