Re: Universal type in Ada

[Martin Krischik <krischik@users.sourceforge.net>]

zw wrote:

> Hi, I am trying to create a Universal type in Ada such as "Object" in
> Java so that I could define a function that returns a value in this
> Universal type, then I could lower-cast value in this type to its
> specific type such as String, Float or any user-defined types. Because
> in Java if a method returns an Object, it could be casted to any other
> types that are subtypes of Object.

In Ada you don't usually "cast" types you convert them. Read the article
about type conversions:

http://en.wikibooks.org/wiki/Programming:Ada:Subtypes#Converting_Data

> Is there a Universal type in Ada? 
> Could anyone tell me how to create such types in Ada, please?

A tagged type will do:

http://en.wikibooks.org/wiki/Programming:Ada:OO

Martin

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