Re: Performance of String Operations

[Colin S. Miller]

Nordlöw wrote:
> Does Emacs contain append/prepend/concat functions for strings that
> modify one of its (first) arguments (for side effects only)?
>
> If so, why not?: Isn't such a function crucial to the performance of a
> language, regarding that strings is such a common object type?
>
> Or does the Emacs compiler optimize such things? Can I somehow
> investigate how Emacs has optimized my lisp code?
>
> /Nordlöw

Nordlöw,

do you mean instead of
(setq a (concat a b c))
you can use
(concat-inplace 'a b c)
?
I don't think lisp supports the second style.
To support it, either all strings have to be over-allocated,
or atleast have space after them for growth.

HTH,
Colin S. Miller



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