ArrayClasses/Visitor.cpp at main · garthcast95/ArrayClasses · GitHub

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class element_concrete_1;
class element_concrete_2;
class visitor
{
  public:
    virtual void visit(element_concrete_1& el) = 0;
    virtual void visit(element_concrete_2& el) = 0;
};
class visitor_concrete : public visitor
{
  public:
    virtual void visit(element_concrete_1& el) override
    {
      // Do something with el
    };
    virtual void visit(element_concrete_2& el) override
    {
      // Do something with el
    };
};
class element
{
  public:
    virtual void accept(visitor& v) = 0;
};
class element_concrete_1 : public element
{
  public:
    virtual void accept(visitor& v) override
    {
      v.visit(*this);
    }
};
class element_concrete_2 : public element
{
  public:
    virtual void accept(visitor& v) override
    {
      v.visit(*this);
    }
};