Re: One trivial querstion about datatype

[Dmitry Morozhnikov]

On Sun, 23 Dec 2001, Keith Wright wrote:

??>> From: Dmitry Morozhnikov <address@hidden>
??>> But why guile can`t have vector-set-length! as in
??>> SCM? It is easy in implementation and usefull.
KW> It's just as easy to implement in Scheme as in C.
KW> Unless I am missing something, the implementation would
KW> be about the same in either case.  The C standard
KW> library has a procedure 'realloc' which also does the
KW> same thing---if the vector is too short, allocate one
KW> twice as long and copy all the elements into it.
KW> Without very special purpose and expensive hardware for
KW> RAM there isn't any much better way to do it.

As i can see, this is not always  correct.  Glibc  use  mmap()  in
malloc() for some big chunks (>= 128kB by  default)  and  mremap()
for realloc(). Also it try to avoid malloc-copy-free  if  possible
for chunks allocated in regular memory.

??>> It`s intresting..  Go  look  how  it  implemented  in  perl..
KW> Oh, not today.  Somebody else, who knows where to look, can
KW> go look and post a hundred words or less on what
KW> great idea is in there.

Ups.. Sorry.. :-)

-- 
DM, Dmitry Morozhnikov, PGPKEY 0xB6C14D95