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"Default" method

by v_melnik (Scribe)
on Oct 08, 2014 at 12:15 UTC ( [id://1103159]=perlquestion: print w/replies, xml ) Need Help??

v_melnik has asked for the wisdom of the Perl Monks concerning the following question:

Dear monks,

I saw a cool trick that XML::LibXML, Throwable and some other libraries can do: when you try to get the value of the variable containing a reference to the object, you get the result of calling one of its' methods (for example as_string() instead of "SomeClass=HASH(0xdeadbeef)".

How to do that?

Thank you!

UPD: Thank you for replies, the "overload" pragma is exactly what I need!

V.Melnik

Replies are listed 'Best First'.
Re: "Default" method
by McA (Priest) on Oct 08, 2014 at 12:17 UTC

    Hi,

    you can do that with overloading the stringification operator in your class.

    use overload (
    '""' => sub { shift->to_string; },
);

    [download]

    where to_string is the method returning a string representation.

    Regards
    McA

[reply]
[d/l]
[select]
Re: "Default" method
by Anonymous Monk on Oct 08, 2014 at 12:18 UTC
[reply]

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