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  1. module Protocol
  2.   class Packet
  3.     def self.packet_id
  4.       rand(10)
  5.     end
  6.   end
  7.  
  8.   class A < Packet
  9.   end
  10.  
  11.   class B < Packet
  12.   end
  13.  
  14.   class NotAPacket
  15.   end
  16. end
  17.  
  18. mapping = Protocol.constants.each_with_object({}) do |constant_name, result|
  19.   klass = Protocol.const_get(constant_name)
  20.   next unless klass.is_a?(Class)
  21.   next unless klass <= Protocol::Packet
  22.   result[klass.packet_id] = klass
  23. end
  24.  
  25. p mapping
  26.  
Success #stdin #stdout 0s 4716KB
comments (?)
stdin 
Standard input is empty
stdout 
{2=>Protocol::Packet, 9=>Protocol::A, 1=>Protocol::B}
https://ideone.com/Cn6hT
language:
Ruby (ruby 2.5.5)
created:
12 years ago
visibility:
public

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