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CheckedPtr.hh

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#ifndef MANGO_CHECKED_PTR
#define MANGO_CHECKED_PTR

#include <assert.h>
#include "nullness.hh"

namespace MangoPtr
{
    
template <typename T>
class CheckedPtr
{
    public:
        template <typename O2Type> friend class CheckedPtr;
    
        CheckedPtr(T* ptr): ptr(ptr) {}
        CheckedPtr(const CheckedPtr& rhs): ptr(rhs.ptr) {}
        template <typename T2>
        CheckedPtr(const CheckedPtr<T2>& rhs): ptr(rhs.ptr) {}
        

        template <typename T2>
        bool operator==(const CheckedPtr<T2>& rhs) const {return ptr == rhs.ptr;}
        template <typename T2>
        bool operator!=(const CheckedPtr<T2>& rhs) const {return ptr != rhs.ptr;}
        template <typename T2>
        bool operator< (const CheckedPtr<T2>& rhs) const {return ptr <  rhs.ptr;}

        bool operator==(T* rhs) const {return ptr == rhs;}
        bool operator!=(T* rhs) const {return ptr != rhs;}
        bool operator< (T* rhs) const {return ptr <  rhs;}
        
        T* operator->() const {
            assert(isNotNull(ptr));
            return ptr;}

        T& operator*() const {        
            assert(isNotNull(ptr));
            return *ptr;}

        operator T*() const {return ptr;}
        
    private:
        T* const ptr;
};

} // namespace MangoPtr


template <typename T>
inline bool 
isNull(const MangoPtr::CheckedPtr<T>& p) {return 0==(T*)p;}

template <typename T>
inline bool 
isNotNull(const MangoPtr::CheckedPtr<T>& p) {return 0!=(T*)p;}


#endif // MANGO_CHECKED_PTR

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