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Potocol
Description
The idea here is to have a "set of methods". So, you can test a class based on that set of methods. But different from roles with stubbed methods it doesn't need do be "doesed" to be matched. It does create a subset but using a different syntax, and will check the methods.
Synopsis
use Protocol;
protocol Writer { # creates a Writer protocol that have a write method
method write { ... }
}
sub write(Writer $w) { # accepts a Writer
$w.write
}
class JustAGreeter { # no roles, parents nor protocols declared on the class
method write { # it has the write method, so it attends to the protocol
say "Hello protocol!"
}
}
write JustAGreeter.new; # prints: Hello protocol!