Re: Flex 2.5.11 comments

[John Millaway]

> 3. yyalloc, yyrealloc, and yyfree are declared and
>     called with an additional argument in reentrant
>     scanners, but in no case is the additional argument
>     used.  It would be nice if these three were declared
>     and called without the additional argument so as to
>     be compatible with standard malloc, realloc, and free
>     function calls (in case the user wants to redefine
>     them).

This is for consistency's sake in the reentrant API. More importantly, it is
the only way to pass a custom allocator to these functions. For example, it can
be used with a pooled memory allocator, such as Apache's APR
(http://apr.apache.org/), in which the caller needs to pass a handle to the
desired memory pool. Without the additional argument, you'd need global
variables to pass information to the reentrant scanner... which is a no-no.

The default implementations of yyalloc, yyrealloc, and yyfree do not use the
additional argument because they are just wrappers around standard malloc,
realloc, and free.

-John



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