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Newsgroups: comp.lang.ada
Date: Mon, 15 Mar 2021 09:46:37 -0700 (PDT)
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Subject: Ada and "early return" - opinion/practice question
From: John McCabe <john@mccabe.org.uk>
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Xref: reader02.eternal-september.org comp.lang.ada:61524
List-Id: <comp.lang.ada>

I hope this isn't a FAQ (it's hard to find relevant articles) but can someo=
ne guide me on the 'normal' treatment in Ada style of what appears to be re=
ferred to (by C/C++ programmers) as early-return.

For example, you have a C++ function (pseudo code sort of thing):

<sometype> fn(<some parameters>)
{
    if (<some undesirable condition 1>)
    {
        return <something bad happened 1>;
    }

    if (<some undesirable condition 2>)
    {
        return <something bad 2>;
    }

    if (<some undesirable condition 3>)
    {
        return <something bad 3>;
    }

    // Only get here if everything's good...
    <do some real stuff>
    return <something good>;
}

I've probably mentioned this before, but it's a long time since I used Ada =
in anger and I don't remember seeing stuff like that when I did use Ada a l=
ot; does anyone write stuff like that in Ada?

When I first learnt to program properly it was using Pascal with, as I reme=
mber it, only one return from a function being allowed, so over the years I=
've mostly looked at positive conditions and indented stuff, pulling the st=
uff in the middle out into its own procedure or function where appropriate,=
 but you see so many people defending this style in C/C++ that I wonder whe=
ther it really is defensible?

Hope this is ok to ask!

John