Callables can be stored in
&-sigiled containers, the default type constraint of such a container is
my = ; # Empty block needs a semicolonmy = -> ;my = sub () ;sub foo() ;my = ;
method CALL-ME(Callable : |arguments)
This method is required for the
( ) postcircumfix operator and the
.( ) postcircumfix operator. It's what makes an object actually call-able and needs to be overloaded to let a given object act like a routine. If the object needs to be stored in a
&-sigiled container, it has to implement Callable.
does Callablemy = A;say a(); # OUTPUT: «called␤»
Callable role is not a requirement to make an object callable; if a class simply wants to add subroutine-like semantics in a regular scalar container, the submethod
CALL-ME can be used for that.
my = A.new: values => [4,5,6,7];say (2); # OUTPUT: «6␤»