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  1. class Interface
  2. {
  3. public:
  4.    virtual void someMethod() = 0;
  5.    virtual void someOtherMethod() const = 0;
  6. };
  7.  
  8. template<class I>
  9. class ProxyBase
  10. {
  11. public:
  12.     template<class> friend class ProxyBase;
  13.  
  14.     ProxyBase(I& actualObject)
  15.     : actualObject(&actualObject){}
  16.  
  17.     //conversion ctor
  18.     ProxyBase(ProxyBase<Interface> const& other):actualObject(other.actualObject){}
  19.  
  20.     //conversion op=
  21.     ProxyBase & operator=(ProxyBase<Interface> const& other){
  22.         actualObject = other.actualObject;
  23.         return *this;
  24.     }
  25.  
  26.     void someMethod()
  27.     {
  28.         // mache irgendwas
  29.         actualObject->someMethod();
  30.     }
  31.     void someOtherMethod() const
  32.     {
  33.          // mache irgendwas
  34.          actualObject->someOtherMethod();
  35.     }
  36.  
  37. private:
  38.     I* actualObject;
  39. };
  40.  
  41. typedef ProxyBase<Interface> Proxy;
  42. typedef ProxyBase<Interface const> ConstProxy;
  43.  
  44. #include <iostream>
  45.  
  46. class ActualObject : public Interface
  47. {
  48.     void someMethod()
  49.     {
  50.         std::cout << "ActualObject::someMethod()\n";
  51.     }
  52.  
  53.     void someOtherMethod() const
  54.     {
  55.         std::cout << "ActualObject::someOtherMethod() const\n";
  56.     }
  57. };
  58.  
  59. int main()
  60. {
  61.     const ActualObject someObject;
  62.     ActualObject someNonConstObject;
  63.  
  64.     ConstProxy proxy(someObject);
  65.     proxy.someOtherMethod();
  66.  
  67.     Proxy proxy2(someNonConstObject);
  68.     proxy2.someOtherMethod();
  69.     proxy2.someMethod();
  70. }
Success #stdin #stdout 0s 3296KB
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Standard input is empty
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ActualObject::someOtherMethod() const
ActualObject::someOtherMethod() const
ActualObject::someMethod()
https://ideone.com/BacScB
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

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