perl vs. C++ operators

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

Hello, I would like to know how I override an operator such as * for e.g. this 3d engine pseudo code :

sub matrix_calculate
{
  my ($self, $matrix) = shift;

  ###return 
  my ($matrix4) = $self->{$matrixX} * $self->{$matrixY} * $self->{$mat
+rixZ} * $self->{$matrix};
}
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The meaning of the XYZ matrices are the rotation matrices with sin and cos.

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Re: perl vs. C++ operators by Your Mother (Archbishop) on Oct 09, 2017 at 14:58 UTC
You want overload; its doc is quite good so I am not going to attempt a rehashed synopsis. I recommend you take a good look at PDL before you go ahead with what you're doing though.	[reply]
Re: perl vs. C++ operators by Corion (Patriarch) on Oct 09, 2017 at 14:58 UTC
See the overload pragma, which allows you that. Also, note that assignment is not really overloadable and some other caveats to overload.	[reply]
Re: perl vs. C++ operators by LanX (Saint) on Oct 09, 2017 at 14:58 UTC
`$self->{$matrixX}` and the others need to be objects of a class (basically `bless`ed to Package ) which `overload`s the operators. Cheers Rolf _{(addicted to the Perl Programming Language and ☆☆☆☆ :) Je suis Charlie!}	[reply] [d/l]
Re: perl vs. C++ operators by Anonymous Monk on Oct 09, 2017 at 16:18 UTC
You don't necessarily have to roll your own matrix class, there are a number of them out there already. If you're doing a lot of numerical work, you might like PDL::Matrix (though it uses `x` for matrix multiplication, leaving `*` for elementwise multiplication). If you're doing exclusively 3d work, you might want something specialized for that purpose, but I don't have a module to suggest.	[reply]
Re: perl vs. C++ operators by etj (Priest) on May 08, 2022 at 18:01 UTC
For 3D work in PDL, there's PDL::Graphics::TriD to visualise things in various ways. There's also PDL::Graphics::TriD::Quaternion, not hyperlinked because not indexed by MetaCPAN; it's in a slightly rough state (e.g. doesn't have the obvious overloads), but is used by the UI interaction code, so actually works very well.	[reply]
Re^2: perl vs. C++ operators by Anonymous Monk on May 09, 2022 at 14:21 UTC
PDL::Graphics::TriD::Quaternion	[reply]