NAME

SPVM::Comparator - a callback type for comparation

SYNOPSYS

use SPVM::Comparator;

my $comparator : SPVM::Comparator = sub : int ($self : self, $obj1 : object, $obj2 : object); {
  my $point1 = (SPVM::Point)$obj1;
  my $point2 = (SPVM::Point)$obj2;
  
  if ($point1->x > $point2->x) {
    return 1;
  }
  elsif ($point1->x < $point2->x) {
    return -1;
  }
  else {
    return 0;
  }
};

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

DESCRIPTION

SPVM::Comparator is a callback type to compare objects.

CALLBACK METHOD

sub : int ($self : self, $obj1 : object, $obj2 : object);

This method should receive two objects and return 1 if $obj1 is more than $obj2, -1 if $x is lass than $obj2, 0 if $obj1 equals $obj2 in the implementation.