Re: Ada.Containers.Indefinite_Doubly_Linked_Lists

["Jeffrey R. Carter" <jrcarter@acm.org>]

Carroll, Andrew wrote:
> 
> Type Attribute is record
> 	Name: String(50);
> 	Type: String(25);

Type, of course, is a reserved word. String is an unconstrained array 
type, and needs to be constrained by a range:

Name : String (1 .. 50);

Note that Name will always be 50 characters. If you want Names of 
varying lengths, Unbounded_String is probably the easiest way to go.

> I'm kind of lost though as to where these package declarations should
> go.  Should they be like:
> 
> Package Table_List_Thingy is
> 
> 	Type Attribute is record
> 		Name: String(50);
> 		Type: String(25);
> 		...
> 	End record;
> 
> 	Package Attribute_List is new new
> Ada.Containers.Indefinite_Doubly_Linked_Lists (Attribute);
> 
> OR
> 
> Procedure RunMe(...) is 
> 
> 	Type Attribute is record
> 		Name: String(50);
> 		Type: String(25);
> 		...
> 	End record;
> 
> 	Package Attribute_List is new new
> Ada.Containers.Indefinite_Doubly_Linked_Lists (Attribute);

Yes. Either will work. Which you should use depends on the problem and 
your design. (Here we encounter one of Ada's most valuable features: you 
have to think about design before you start coding.)

It doesn't look as if you need the indefinite version for either of your 
lists.

-- 
Jeff Carter
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Monty Python's Flying Circus
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