比較兩個繼承對象Ruby

Question

我有一個基類，它包含一個等於？方法。我已經繼承了那個對象並且想要使用平等的？方法在超類中作爲平等的一部分？方法在子類中。

class A 
     @a 
     @b 

    def equal?(in) 
     if(@a == in.a && @b == in.b) 
     true 
     else 
     false 
     end 
    end 
end 

class B < A 
     @c 
    def equal?(in) 
    #This is the part im not sure of 
    if(self.equal?in && @c == in.c) 
     true 
    else 
     false 
    end 
    end 
end 

如何引用子類中的繼承的A類對象，以便我可以進行比較？

乾杯

丹

Answer 1

class A 
    attr_accessor :a, :b 
    def equal? other 
    a == other.a and b == other.b 
    end 
end 

class B < A 
    attr_accessor :c 
    def equal? other 
    # super(other) calls same method in superclass, no need to repeat 
    # the method name you might be used to from other languages. 
    super(other) && c == other.c 
    end 
end 

x = B.new 
x.a = 1 
y = B.new 
y.a = 2 
puts x.equal?(y)