handle.hpp

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#ifndef _HANDLE_HPP
#define _HANDLE_HPP

template <typename T>
class PointerHandle {
private:
  T* ptr;
public:
  const T& operator*() const { return *ptr; }
  T& operator*() { return *ptr; }
  const T* operator->() const { return ptr; }
  T* operator->() { return ptr; }
  bool valid() const { return (ptr != NULL); }
  
  PointerHandle() { ptr = NULL; }
  PointerHandle(const PointerHandle<T> &vh) { this->ptr = vh.ptr; }
  PointerHandle(T* ptr) { this->ptr = ptr; }
  PointerHandle(T& item) { this->ptr = &item; }

  bool operator==(const PointerHandle<T>& other) const 
  { return (ptr == other.ptr); }
  bool operator!=(const PointerHandle<T>& other) const 
  { return (ptr != other.ptr); }
  bool operator<(const PointerHandle<T>& other) const 
  { return (ptr < other.ptr); }

  const PointerHandle<T>& operator=(const PointerHandle<T>& other) 
  { this->ptr = other.ptr; return *this; }
};

#endif

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