NAME

SPVM::Comparator::Object - Comparator::Object in SPVM | a callback interface for comparation

SYNOPSYS

use Comparator::Object;

my $comparator : Comparator::Object = method : int ($object1 : object, $object2 : object); {
  my $point1 = (Point)$object1;
  my $point2 = (Point)$object2;
  
  if ($point1->x > $point2->x) {
    return 1;
  }
  elsif ($point1->x < $point2->x) {
    return -1;
  }
  else {
    return 0;
  }
};

my $point1 = Point->new(1, 2);
my $point2 = Point->new(5, 6);
my $result = $comparator->($point1, $point2);

DESCRIPTION

Comparator::Object is a callback interface to compare two objects.

CALLBACK METHOD INTERFACE

method : int ($object1 : object, $object2 : object);

This method must receive two objects and return 1 if $object1 is more than $object2, -1 if $x is less than $object2, 0 if $object1 equals $object2 in the implementation.

This method is planned to be implemented in other classes.