Dual value integer and string
class IntStr is Allomorph is Int { }
IntStr is a dual value type, a subclass of both Allomorph, hence Str, and Int.
See Allomorph for further details.
my $int-str = <42>;
say $int-str.^name; # OUTPUT: «IntStr»
my Int $int = $int-str; # OK!
my Str $str = $int-str; # OK!
# ∈ operator cares about object identity
say 42 ∈ <42 55 1>; # OUTPUT: «False»
method new(Int $i, Str $s)
The constructor requires both the Int and the Str value, when constructing one directly the values can be whatever is required:
my $f = IntStr.new(42, "forty two");
say +$f; # OUTPUT: «42»
say ~$f; # OUTPUT: «"forty two"»
method Int
Returns the integer value of the IntStr.
multi method Numeric(IntStr:D: --> Int:D)
multi method Numeric(IntStr:U: --> Int:D)
The :D variant returns the numeric portion of the invocant. The :U variant issues a warning about using an uninitialized value in numeric context and then returns value 0.
multi method Real(IntStr:D: --> Int:D)
multi method Real(IntStr:U: --> Int:D)
The :D variant returns the numeric portion of the invocant. The :U variant issues a warning about using an uninitialized value in numeric context and then returns value 0.
multi infix:<===>(IntStr:D $a, IntStr:D $b)
IntStr Value identity operator. Returns True if the Int values of $a and $b are identical and their Str values are also identical. Returns False otherwise.