OpenEuphoria

Re: Reverse() was: Win32Lib Update

• Posted by Ralf Nieuwenhuijsen <nieuwen at XS4ALL.NL> Nov 29, 1998
• 646 views

>This raises a couple of issues:
>    1. I should probably not make it an error (just a warning) to override
>        a global symbol with a local symbol. The local should
>        take precedence within the file it is declared in.
>        I'm not sure if I'll do it for this release. It involves changes
>        to compile-time symbol lookup, run-time symbol lookup
>       (trace and routine_id) as well as the bind.ex program.
>       It would alleviate some of the namespace conflicts.

Ive mentioned this before, a warning might be in place, but you should
always be able to overwrite a global identifer with a local identifer. I
only think you should see a warning when you overwrite a global identifer.

>    2. Which reverse() is the fastest? I was planning to add a
>         Euphoria-coded reverse() to misc.e. A few weeks ago
>         I coded reverse5() below, but it looks like reverse2() (Hawke)
>         is the fastest, so I'll use his unless someone comes up
>         with something even faster.


Good, it sounds like we're going to see some general purpose routines, and
maybe containing a boolean type. Ive had many conflicts with them that I
decided to add them to the beginning of every file *locally* .. if they
would in an standard Euphoria file, one could trust the convention.

Its just:

global constant
 TRUE = 1,
 FALSE = 0,
 NONE = -1

global type boolean (object x)
    if integer (x) then
        return x > -2 and x < 2
    else
        return FALSE
    end if
end type


The none is just a flag value. And could be used with result of find () or
any of the input routines.

Ralf