typed

accessor.rb

class Module
	def sticher_accessor **opt
		opt.each { |name, type|
			if type.class == Class
# 				value = type.new
				value = nil
			else
				value = type
				type  = type.class
			end

			define_method name do
				if instance_variable_defined? "@#{name}"
					instance_variable_get "@#{name}"
				else
					value
				end
			end

			define_method "#{name}=" do |var|
				raise "No match type." unless var.class <= type
				instance_variable_set "@#{name}", var
			end
		}
	end
end


class X
	sticher_accessor name: String, age: Numeric
end


x = X.new.tap{ |x|
	p x.name
	x.name = "homu"
	x.age  = 13
	
	# error
# 	x.name = 13
}
p x
# => #<X:0x00000000f00a78 @name="homu", @age=13>