(unknown charset) RE: Named Integers: What possible problems could they cause?

From: (unknown charset) John Stout <"John>
Date: Tue, 23 Nov 2004 21:43:13 -0000

----boundary-LibPST-iamunique-1179202287_-_-
Content-type: text/plain

Well, what would happen in 'normal' Component Pascal?

In case 1 you'd get a duplicate identifier which is what I'd expect and hope
to get
from something like

CONST
        blue* = 4;
        blue* = 1;

so I don't think that's a problem and would need no change to the compiler,
apart from
the syntactic sugar change.

In the second case when you recompile green is redefined and you get a
'object Test1.blue inconsistently imported from Test2'
error when you try to load the module. Again, no change to the compiler once
the sugar is refined.

John Stout

-----Original Message-----
From: Hof, Philipp [mailto:p.hof{([at]})nowhere.xy
Sent: 21 November 2004 20:52
To: 'blackbox{([at]})nowhere.xy
Subject: RE: Named Integers

> now, what possible problems could they cause?

Just some hurry thoughts:

*******************************************

Problem 1:

TYPE
  Colour* = (red := 3, blue, green);
  CarColour* = (blue, yellow, orange);

If I understand the idea right this would be identical to:
 
CONST
  ...
  blue* = 4;
  blue* = 1;

*******************************************

Problem 2:

TYPE
  Colour* = (red = 3, blue, green);
(* green = 5 *)

changes to:
 
TYPE
  Colour* = (red = 3, blue, lightBlue, green);
(* green = 6 *)

-> Causes a problem to existing (compiled) modules using 'Colour'

*******************************************

Cheers,
Philipp
 


-----Original Message-----
From: Douglas G. Danforth [mailto:danforth{([at]})nowhere.xy
Sent: Sunday, 21 November 2004 2:39 p.m.
To: Stan Warford
Cc: info{([at]})nowhere.xy
Subject: Re: Named Integers

Stan,
I like the idea of Named Integers. They would indeed simplify the
documentation (now, what possible problems could they cause?).
-Doug

Stan Warford wrote:
> The benefit of named integers is self-documentation. On the surface,
> they look like enumerated types, but they are fundamentally different
> because they do not have the implementation problems of type checking
> that enumerated types have. Hence, you get 90% of the benefits of
> enumerated types with 10% of the implementation cost.
>
> Here is an example. In the documentation for Module Ports, we have
>
> CONST
> invert = 0; hilite = 1; dim25 = 2; dim50 = 3; dim75 = 4;
>
> Then, later in the documentation we have
>
> (f: Frame) MarkRect (l, t, r, b, s: INTEGER; mode: INTEGER; show:
> BOOLEAN), NEW;
>
> Then, still later in the documentation, we have this explanation
>
> CONST invert, hilite, dim25, dim50, dim75 These values may be passed
> as mode-parameter to procedure MarkRect.
>
> The parameter list of MarkRect is _not_ self-documenting. All you know
> by looking at formal parameter mode is that it is an integer. All you
> know by looking at the CONST section is that there are some integer
> constants, but you have no way of knowing which of the integer
> constants, if any, is meant to be used as the mode value in MarkRect.
> You must search through the documentation for the explanation.
>
> Named integers would work like this.
>
> TYPE
> MarkMode = (invert, hilite, dim25, dim50, dim75);
>
> (f: Frame) MarkRect (l, t, r, b, s: INTEGER; mode: MarkMode; show:
> BOOLEAN), NEW;
>
> Although the syntax looks like the syntax of enumerated types, named
> integers are _not_ enumerated types. As I understand it, 90% of the
> difficulty of implementing enumerated types is the type checking that
> must occur across modules. The implementation difficulty was so severe
> that enumerated types were not included in the definition of CP.
>
> Named integers have none of the implementation problems of enumerated
> types. They are simply a syntactic sugar that provide an immense
> benefit of self-documentation for a very small price. They do not
> introduce a new type. Named integers _are_ integers. In general
>
> TYPE Alpha = (beta, gamma, delta);
>
> is _defined_ to be exactly equivalent to
>
> TYPE Alpha = INTEGER;
> CONST beta = 0; gamma = 1; delta = 2;
>
> As far as export is concerned
>
> TYPE Alpha* = (beta, gamma, delta);
>
> is defined to be equivalent to
>
> TYPE Alpha* = INTEGER;
> CONST beta* = 0; gamma* = 1; delta* = 2;
>
> There is no need for complex type-checking rules with enumerated
> values as there is in C++. gamma _is_ an INTEGER and can be used
> anywhere an integer can be used. mode is still an INTEGER. Named
> integers would change _nothing_ in the implementation of the entire
> BlackBox framework except
for
> making the interfaces much easier to read.
>
> When I was first learning the BB framework I was used to software
> design that emphasized enumerated types for self-documentation. It was
> a source of irritation to see an integer parameter in a formal
> parameter list and not know immediately which set of integer constants
> applied to it. I think one reason it has been a hard sell to the folks
> at Oberon microsystems is that they are so familiar with the framework
> that they forget what it is like for a novice to be learning BB for
> the first time.
>
> Stan
>
> J. Stanley Warford
> Professor of Computer Science
> Pepperdine University
> Malibu, CA 90263
> Stan.Warford{([at]})nowhere.xy
> 310-506-4332
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Received on Tue Nov 23 2004 - 22:43:13 UTC