From: Jacques GARRIGUE <garrigue@kurims.kyoto-u.ac.jp>
To: mottl@miss.wu-wien.ac.at
Cc: caml-list@inria.fr
Subject: Re: lexer, parser
Date: Tue, 15 Jun 1999 11:01:50 +0900 [thread overview]
Message-ID: <19990615110150N.garrigue@kurims.kyoto-u.ac.jp> (raw)
In-Reply-To: Your message of "Sat, 12 Jun 1999 13:02:58 +0100 (MET DST)" <199906121102.NAA30678@miss.wu-wien.ac.at>
From: Markus Mottl <mottl@miss.wu-wien.ac.at>
> Execution of "semantics" is also much faster than versions that use
> algebraic datatypes and pattern matching, because here we only have to
> call methods (wrapped in the functions of the stream) on objects instead
> of match abstract syntax trees or else.
Sorry to answer pinpoint, but I just want to avoid a confusion.
In caml pattern-matching is much more efficient than calling a method.
Calling a method is a dynamic operation, involving looking-up a table
and calling a possibly curried function, while pattern-matching is
completely statically compiled.
OO may help you structure your program, but when algebraic datatypes
are handy, I would suggest sticking with them.
Jacques
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Jacques Garrigue Kyoto University garrigue at kurims.kyoto-u.ac.jp
<A HREF=http://wwwfun.kurims.kyoto-u.ac.jp/~garrigue/>JG</A>
next prev parent reply other threads:[~1999-06-15 20:47 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <0580637621241002*/c=FR/admd=ATLAS/prmd=SG/o=INFI/s=EBER/g=JEAN-MARC/@MHS>
[not found] ` <0579137620FCB001*/c=FR/admd=ATLAS/prmd=SG/o=INFI/s=EBER/g=JEAN-MARC/@MHS>
1999-06-03 11:55 ` John Skaller
1999-06-12 12:02 ` Markus Mottl
1999-06-15 2:01 ` Jacques GARRIGUE [this message]
1999-06-15 10:20 ` Markus Mottl
1999-06-14 7:15 ` Christian Lindig
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