Re: How can I create an empty array of a generic type?

[b.mcguinness747@gmail.com]

On Friday, July 12, 2019 at 11:36:02 PM UTC-4, b.mcgui...@gmail.com wrote:
> I have a generic package
> 
> 
> generic
>   type Element_Type is private;
>   type Key_Component_Type is private;
>   with function "<" (Left, Right : Key_Component_Type) return Boolean is <>;
>   with function "=" (Left, Right : Element_Type) return Boolean is <>;
> package Ternary_Trees is
> 
> ...
> 
> 
> private
> 
> ...
> 
>   Empty_Key  : constant Key_Type(1..0) := (others => Key_Component_Type'First);
> 
> ...
> 
> end Ternary_Trees;
> 
> 
> When I try to compile the package, I get an error message:
> 
> ternary_trees.ads:77:54: prefix for "First" attribute may not be private type
> 
> 
> How can I make this work?  I want to create an empty array so I can build up a key through concatenation as I descend recursively through a tree.
> 
> Thanks.
> 
> --- Brian McGuinness

Ok.  Thanks for the help

--- Brian McGuinness