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From: Adam Beneschan <adam@irvine.com>
Newsgroups: comp.lang.ada
Subject: Re: Ada2012 : Expression functions and extended return statements
Date: Fri, 6 Jan 2012 08:38:49 -0800 (PST)
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Date: 2012-01-06T08:38:49-08:00
List-Id: <comp.lang.ada>

On Jan 6, 8:33=A0am, Adam Beneschan <a...@irvine.com> wrote:
> On Jan 6, 12:45=A0am, Martin <mar...@thedowies.com> wrote:
>
>
>
>
>
> > Also, on the topic of extended return statements...
>
> > What's the rational for having to explicitly repeat the return type?
> > Seems rather redundant to my eyes. I wouldn't have minded:
>
> > function Bar return Some_Type is
> > begin
> > =A0 =A0return Result : <> do
> > =A0 =A0 =A0 -- something to initialise 'Result'
> > =A0 =A0end return;
> > end Bar;
>
> > or even
>
> > function Bar return Some_Type is
> > begin
> > =A0 =A0return Result do
> > =A0 =A0 =A0 -- something to initialise 'Result'
> > =A0 =A0end return;
> > end Bar;
>
> > In this case, 'Result' can't be anything other than of type
> > 'Some_Type' can it?
>
> Yes, it can. =A0If Some_Type is a class-wide type, Result's type must be
> a specific type. =A0If Some_Type is, say, an unconstrained array type,
> Result's type must be a constrained subtype.

Oops, I goofed.  Result's type doesn't *have* to be a specific,
constrained subtype, if there is an initial value (which could be a
function call, say); the specific type and subtype are then determined
from the value.  If there is no initial value, however, then Result's
type does have to be constrained.

                        -- Adam