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Re: [PATCH] Improved `scm_from_locale_symbol ()' + `scm_take_locale_symb

From: Ludovic Courtès
Subject: Re: [PATCH] Improved `scm_from_locale_symbol ()' + `scm_take_locale_symbol ()'
Date: Tue, 24 Jan 2006 15:22:18 +0100
User-agent: Gnus/5.110004 (No Gnus v0.4) Emacs/21.4 (gnu/linux)

address@hidden (Han-Wen Nienhuys) writes:

> In article <address@hidden>,
> Ludovic Courtès <address@hidden> wrote:


>>This second modification has a nice effect: it can significantly reduce
>>the number of objects created at load-time.  Unfortunately, Guile's
>>built-in reader always produces Scheme strings (in `scm_read_token ()')
>>so it cannot benefit from this optimization.
> Why isn't it possible to write a
>   take_symbol_from_string()
> which takes the C-string inside the SCM string, and sets the data of
> the SCM string to NULL? Or am I missing wrt to shared strings? 

I'd say because the underlying `stringbuf' cannot be shared between a
symbol and a string.

Theoretically, it should be doable but we'd have to generalize things
like `scm_i_string_writable_chars ()' so that it works also for symbols.


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