In the latest development releases of Types::Standard, you can do this:

use Types::Standard is_InstanceOf => { of => "FishTaco::Topping", -as 
+=> "is_Topping" };

is_Topping( $something );  # returns a boolean

[download]

If you've got Type::Tiny::XS installed, this will be an XS function, so pretty darn fast to call. I haven't done a lot of benchmarking on it, but I'd wager a lot faster than a blessed+isa check. If you don't, then it's still not going to be slow.

(Older versions, you can do something like this for the same effect...

BEGIN {
  require Types::Standard;
  *is_Topping = Types::Standard::InstanceOf->parameterize("FishTaco::T
+opping")->compiled_check;
};

[download]

Newer versions just provide support for of in the import method.)

toby döt ink

In reply to Re^3: Trouble with, or misunderstanding of, Types::Standard ArrayRef[elements] enforcement in Moo by tobyink
in thread Trouble with, or misunderstanding of, Types::Standard ArrayRef[elements] enforcement in Moo by Your Mother

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