Class: Class

Inherits:
Object
  • Object
show all
Defined in:
lib/setonce.rb

Overview

Class

Instance Method Summary collapse

Instance Method Details

#attr_set_once(*atts) ⇒ Object

attr_set_once



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# File 'lib/setonce.rb', line 6

def attr_set_once(*atts)
	atts.each do |att|
		att = att.to_s
		
		# set
		define_method("#{att}=") do |val|
			if instance_variable_defined?("@#{att}")
				raise 'set-once-instance-variable-already-set: ' + att
			else
				instance_variable_set "@#{att}", val
			end
		end
		
		# get
		define_method("#{att}") do
			if instance_variable_defined?("@#{att}")
				return instance_variable_get("@#{att}")
			else
				return nil
			end
		end
	end
end