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Newsgroups: comp.lang.ada
Subject: Re: Types,
 packages & objects : the good old naming conventions question (without
 religious ware)
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From: Stephen Leake <stephen_leake@stephe-leake.org>
Date: Sat, 31 Oct 2009 08:18:40 -0400
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Date: 2009-10-31T08:18:40-04:00
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tmoran@acm.org writes:

>> An example trap (to me at least) : what about a type which would seems
>> obviously named Size and a parameter which seems obviously named
>> Size ? X would surely not be OK, neither Item.
>
>   There is no Size by itself - it's the Size of something. So a function
> to calculate the price of a pumpkin, based on its size, would be
>   function Price(Pumpkin_Size : Size) return Dollars;

You need 100,000 of these functions in a typical large grocery store.
Ada doesn't support this:

   function Price(Pumpkin_Size : Size) return Dollars;
   function Price(Milk_Size : Size) return Dollars;
   function Price(Granny_Smith_Apple_Size : Size) return Dollars;

Clearly this will be

   function Price (Item : Item_Type; Size : Size_Type) return Dollars;

The context associates Size with Item; no need to add more noise.

>   function Price(Its_Size : Size) return Dollars;
> That's as far as you can go if Size is the type name. If you used
> something else, eg Size_Type or Size_T or Sizes, then you could
> shorten the parameter name all the way to Size. Since you probably
> write variable names much more often in the code than the type name,
> it makes sense to try to shorten them, at the expense of slightly
> longer type names. IMHO

Exactly; that's why we use Size_Type.

-- 
-- Stephe