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From: Stephen Leake <Stephen.Leake@gsfc.nasa.gov>
Subject: Re: Warning: Religious naming convention discussion :-) [was: assign
 help!!]
Date: 1997/05/14
Message-ID: <337A1B42.7276@gsfc.nasa.gov>#1/1
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References: <33779E0D.61F8@sprintmail.com> <3378BBD2.7BBA@this.message>
 <3379606E.413E@sprintmail.com> <5lcefp$riu$1@ash.ridgecrest.ca.us>
Organization: NASA Goddard Space Flight Center -- Greenbelt, Maryland USA
Reply-To: Stephen.Leake@gsfc.nasa.gov
Newsgroups: comp.lang.ada
Date: 1997-05-14T00:00:00+00:00
List-Id: <comp.lang.ada>


Do-While Jones wrote:
> 
> Speaking from a maintenance point-of-view, I certainly prefer
> 
>   package Angles is
> 
>     type Degrees is digits ...;
> 
> to
> 
> >  package Angles is
> >
> >    type Angle_Type is digits ...;  -- in degrees
> 
> because it eliminates the need to "grep Angle_Type angles.ads" to see if a
> variable of Angle_Type (declared in a different package) is expressed in
> degrees or radians.

But this package does not prevent someone from writing:

	Angle_In_Radians : Angles.Degrees := Item / 360.0;

If you are trying to enforce units, you need a private type. But then
you need a system of private types providing all units, so this is not
an isolated case.
 
> 
> Never express in a comment that which can be expressed in the code.
> 

More importantly, don't pretend you are providing an abstraction that
you are not!

> 
> Do-While Jones
> 

-- 
- Stephe