qwt3d_autoptr.h

#ifndef qwt3d_autoptr_h
#define qwt3d_autoptr_h
 
namespace Qwt3D {
 
template<typename T>
class qwt3d_ptr
{
public:
    // Standard ctor
    explicit qwt3d_ptr(T *ptr = 0) : rawptr_(ptr) { }
    // Dtor (calls T::destroy)
    ~qwt3d_ptr() { destroyRawPtr(); }
 
    // Copy ctor (calls (virtual) clone())
    qwt3d_ptr(qwt3d_ptr const &val) { rawptr_ = val.rawptr_->clone(); }
 
    // Assignment in the same spirit as copy ctor
    qwt3d_ptr<T> &operator=(qwt3d_ptr const &val)
    {
        if (this == &val)
            return *this;
 
        destroyRawPtr();
        rawptr_ = val.rawptr_->clone();
 
        return *this;
    }
 
    // Pointer-like access operator
    T *operator->() const { return rawptr_; }
 
    // Dereferencing operator
    T &operator*() const { return *rawptr_; }
 
private:
    T *rawptr_;
    void destroyRawPtr()
    {
        if (rawptr_)
            rawptr_->destroy();
        rawptr_ = 0;
    }
};
 
} // ns
 
#endif /* include guarded */