Groups > comp.lang.forth > #41962

Re: Strings and numbers

From	Paul Rubin <no.email@nospam.invalid>
Newsgroups	comp.lang.forth
Subject	Re: Strings and numbers
Date	2015-09-11 15:53 -0700
Organization	A noiseless patient Spider
Message-ID	<87k2rwsh2w.fsf@jester.gateway.pace.com> (permalink)
References	(6 earlier) <877fo0t4y0.fsf@jester.gateway.pace.com> <99b72d58-0b1a-4e09-9c34-42ebb844fff8@googlegroups.com> <f8c62977-77d0-47ca-9f21-3c9589ec49a0@googlegroups.com> <87oah9st2o.fsf@jester.gateway.pace.com> <ec7d26f3-8d15-4e8d-a983-7e702b00e4e1@googlegroups.com>

Show all headers | View raw

Richard Todd <richard.wesley.todd@gmail.com> writes:
> using an exception for returning a normal value is another kind of
> smell, is it not?

I actually don't know, and will defer to the Forth gurus about that (I'm
far from one).  It's idiomatic in Lisp to use catch/throw that way, so I
went with it.  It's frowned on in Java but I think that's because Java
exceptions are slow and heavy.  I haven't studied how catch/throw is
implemented in Forth but I'm imagining it to be a setjmp/longjmp style
mechanism where the catch handlers are linked through the R stack, with
the innermost one remembered in a static cell, and the handler mostly
just restores the old DP and RP.  So if it works that way, it should be
lightweight and fast.

> I made a pass through it to clean it up.  It's basically the same
> backtracking search,

OK, I'll take a look later.

Thread

Strings and numbers Steve Graham <solitary.wanderer52@gmail.com> - 2015-08-03 13:24 -0700
  Re: Strings and numbers Julian Fondren <julian.fondren@gmail.com> - 2015-08-03 13:51 -0700
    Re: Strings and numbers "Rod Pemberton" <boo@fasdfrewar.cdm> - 2015-08-03 17:38 -0400
    Re: Strings and numbers Steve Graham <solitary.wanderer52@gmail.com> - 2015-08-03 14:44 -0700
  Re: Strings and numbers Paul Rubin <no.email@nospam.invalid> - 2015-08-03 20:59 -0700
    Re: Strings and numbers Steve Graham <solitary.wanderer52@gmail.com> - 2015-08-04 12:19 -0700
      Re: Strings and numbers "WJ" <w_a_x_man@yahoo.com> - 2015-08-07 09:29 +0000
        Re: Strings and numbers "WJ" <w_a_x_man@yahoo.com> - 2015-09-04 15:14 +0000
          Re: Strings and numbers "WJ" <w_a_x_man@yahoo.com> - 2015-09-07 19:34 +0000
            Re: Strings and numbers Julian Fondren <julian.fondren@gmail.com> - 2015-09-08 11:48 -0700
            Re: Strings and numbers Paul Rubin <no.email@nospam.invalid> - 2015-09-09 00:41 -0700
              Re: Strings and numbers Richard Todd <richard.wesley.todd@gmail.com> - 2015-09-10 00:32 -0700
                Re: Strings and numbers Richard Todd <richard.wesley.todd@gmail.com> - 2015-09-10 10:29 -0700
                Re: Strings and numbers Paul Rubin <no.email@nospam.invalid> - 2015-09-10 17:22 -0700
                Re: Strings and numbers Richard Todd <richard.wesley.todd@gmail.com> - 2015-09-10 21:34 -0700
                Re: Strings and numbers humptydumpty <ouatubi@gmail.com> - 2015-09-11 02:16 -0700
                Re: Strings and numbers humptydumpty <ouatubi@gmail.com> - 2015-09-11 07:33 -0700
                Re: Strings and numbers Paul Rubin <no.email@nospam.invalid> - 2015-09-13 00:12 -0700
                Re: Strings and numbers humptydumpty <ouatubi@gmail.com> - 2015-09-13 02:09 -0700
                Re: Strings and numbers Paul Rubin <no.email@nospam.invalid> - 2015-09-11 15:53 -0700
                Re: Strings and numbers Andrew Haley <andrew29@littlepinkcloud.invalid> - 2015-12-18 16:02 -0600
            Re: Strings and numbers "WJ" <w_a_x_man@yahoo.com> - 2015-09-12 23:38 +0000
              Re: Strings and numbers "WJ" <w_a_x_man@yahoo.com> - 2015-09-13 19:41 +0000
            Re: Strings and numbers "WJ" <w_a_x_man@yahoo.com> - 2015-11-29 18:09 +0000

csiph-web