EmptyCrate Software. Travel. Stuff.

class Thing             {}
class Rock     is Thing {}
class Paper    is Thing {}
class Scissors is Thing {}
 
multi sub defeats(Thing    $t1, Thing    $t2) { 0 };
multi sub defeats(Paper    $t1, Rock     $t2) { 1 };
multi sub defeats(Rock     $t1, Scissors $t2) { 1 };
multi sub defeats(Scissors $t1, Paper    $t2) { 1 };
 
my $paper = Paper.new;
my $rock  = Rock.new;
 
say defeats($paper, $rock);
say defeats($rock, $paper);

#include <iostream>
 
class Thing{};
class Rock  : public Thing {};
class Paper : public Thing {};
class Scissors : public Thing {};
 
bool defeats(const Thing &, const Thing &) { return false; }
bool defeats(const Paper &, const Rock &) { return true; }
bool defeats(const Rock  &, const Scissors &) { return true; }
bool defeats(const Scissors &, const Paper &) { return true; }
 
Paper paper;
Rock rock;
 
int main(int, char **)
{
  std::cout << std::boolalpha;
  std::cout << defeats(paper, rock) << std::endl;
  std::cout << defeats(rock, paper) << std::endl;
}