Re: Protected types made of ADT's, and Passive Iterators

[Mats Weber <Mats.Weber@elca-matrix.ch>]

Matthew Heaney wrote:

> What's wrong with this:

You need an exception handler to release the resource on a failure. Note that
almost anything can be raised in Process.

> generic
>    with procedure Process
>       (Item : in out Collection_Item;
>        Quit : in out Boolean);
> procedure Modify_Items (Collection : in out Collection_Type);
> 
> procedure Modify_Items (Collection : in out Collection_Type) is
> 
>    Quit : Boolean := False;
>    List : List_Type;
> begin
> 
>    [as before]
> 
>    Release (Collection.Guard);

  exception
     when others =>
        Release (Collection.Guard);
        raise;
> 
> end Modify_Items;