Re: Ada Basics

[Wes Groleau <wesgroleau@despammed.com>]

Jerry Petrey wrote:
> In the example you cited, there would be little difference since all integer
> types
> are derived types - type one_to_hundred is range 1..100 creates a derived
> type but the compiler chooses which predefined integer type to derive from (it
> might for
> example, choose short_integer).
> With  one_to_hundred is new Integer range 1..100 , you are explicitly choosing
> 
> the parent type to be the predefined type Integer.

The implementation (size, for example) is also inherited.
Which is why one might choose a particular parent.

But also, by making a derived type instead of a (plain) new type,
you may be sending a message to future readers that the parent
type specifically has operations that are important to the derived type.

-- 
Wes Groleau
http://freepages.rootsweb.com/~wgroleau