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Re: Almost certainly a module documentation issue

by ferreira (Chaplain)
on Oct 13, 2017 at 23:27 UTC ( #1201360=note: print w/replies, xml ) Need Help??


in reply to Almost certainly a module documentation issue

Sometimes code involving IO handles can be confusing that is because IO handles are of many kinds in Perl, like globs (the old way), glob refs, IO handles in scalar variables (produced with open and other IO operations), and legit objects which derive from IO::Handle, IO::File, etc.

The code in Email::Sender::Transport::Print wants an IO::Handle, or something that satisfies

 $fh->isa('IO::Handle')

This is far from ideal something more TIMTOWTDI, would be a check like the one of Scalar::Util::openhandle()

As you discovered, $fh is a glob ref, and does not satisfy this precondition. But that does

 *{$fh}{IO}->isa('IO::Handle')

This fact is kind of sparse in perl documentation. For example, you can read that suggested at item 7 at Making References

You may use it in your code right now and / or submit a patch to Email::Sender::Transport::Print maintainer.

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Re^2: Almost certainly a module documentation issue
by haukex (Canon) on Oct 14, 2017 at 06:50 UTC
    that is because IO handles are of many kinds in Perl

    Indeed! A question that tobyink tackled a while back, leading to the creation of IO::Detect.

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