Re: Your wish list for Ada 202X

["björn lundin" <b.f.lundin@gmail.com>]

Den onsdagen den 23:e april 2014 kl. 17:43:48 UTC+2 skrev J-P. Rosen:
> Le 23/04/2014 16:32, björn lundin a écrit :
> 
> >> And what is the benefit over writing:
> >> >    Put_Line (F_T2_Image (V2));
> > not very much.
> > But the usual case is that you have to write
> > Pkg_with_Long_Name.Child_pkg_With_Even_Longer_Name.F_T2_Image(V2)
> > instead of V2'img
> 
> Ah! Another case of "I don't want to use the use clause, give me
> something else that avoids writing these damn long names".

No. using the 'use' is certainly something one can have different opinions on.
But I like to avoid these kind of errors

               SET_ERROR_MODE(NO_ERROR, CRANE_TYPES.ASSIGNMENT_TIMEOUT, FALSE);
                                     |
        >>> error: "NO_ERROR" is not visible
        >>> error: multiple use clauses cause hiding
        >>> error: hidden declaration at crane_types.ads:113
        >>> error: hidden declaration at siemens_interface.ads:374
        >>> error: hidden declaration at core_types.ads:71


One of the best thing with Ada05 was the approval of object.verb notation.
Even if i get to use it seldom at work, I do in hobby projects,
just for this reason. The variable/object knows where it belongs,
no need to use 'use' everywhere.

This is the basic idea for my 'img proposal. 
The variable knows its type. No need to
have long package names or risk hidden declarations.

By the way, the above hidden situation was because of
adding a constant 'NO_ERROR' in siemens_interface.ads

the other two was a constant and a coded value.
no hiding before that.
/Björn