Why not do this: 
my $book = MyPackage->startup( $stuff );

package MyPackage;

sub startup {
    # do stuff here, like creating the object

    # do your check for authority here and exit, if appropriate

    # Do more stuff here

    return $book;
}

[download]

This is the method used by classes like DBI. Calling it startup() makes it more clear to your maintainer (which may be you!) what exactly you're doing. (Which is why I suspect Tim Bunce chose connect() instead of new() for DBI.)

------
We are the carpenters and bricklayers of the Information Age.

The idea is a little like C++ templates, except not quite so brain-meltingly complicated. -- TheDamian, Exegesis 6

... strings and arrays will suffice. As they are easily available as native data types in any sane language, ... - blokhead, speaking on evolutionary algorithms

Please remember that I'm crufty and crochety. All opinions are purely mine and all code is untested, unless otherwise specified.

In reply to Re: Re: OO: Leaving a constructor midway? by dragonchild
in thread OO: Leaving a constructor midway? by jest

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