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  1. struct Visitor { };
  2. struct Env { };
  3. struct InappropriateFunction { };
  4.  
  5. class AbsTree { 
  6.    public:
  7.        AbsTree();
  8.        virtual ~AbsTree() =0;
  9.        virtual void accept(Visitor &visitor) const = 0;
  10.        virtual void execute(Env &ctxt) const throw (InappropriateFunction);
  11. };
  12.  
  13. class Operation: public AbsTree{
  14.    public:
  15.       Operation(char oper);
  16.       virtual ~Operation();
  17.       virtual void accept (Visitor &visitor) const;
  18.       char getOperator() const;
  19.    private:
  20.       char operator_;
  21. };
  22.  
  23. AbsTree::AbsTree() {}
  24. AbsTree::~AbsTree() {}
  25. void AbsTree::accept(Visitor &visitor) const{}
  26. void AbsTree::execute(Env &ctxt) const throw (InappropriateFunction) {}
  27.  
  28. Operation::Operation(char oper): operator_(oper) {}
  29. Operation::~Operation(){}
  30. void Operation::accept(Visitor &visitor) const{}
  31. char Operation::getOperator() const {
  32.    return operator_;
  33. }
  34.  
  35. int main()
  36. {
  37.     Operation o('x');
  38.     Visitor my_visitor;
  39.     o.accept(my_visitor);
  40.     o.getOperator();
  41. }
Success #stdin #stdout 0s 3292KB
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https://ideone.com/Ef22JU
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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