qwt3d_autoptr.h

#ifndef QWT3D_AUTOPTR_H
#define QWT3D_AUTOPTR_H
 
namespace Qwt3D
{
 
template< typename T >
class ClonePtr
{
public:
    // Standard ctor
    explicit ClonePtr(T* ptr = nullptr) : rawptr_(ptr)
    {
    }
    // Dtor (calls T::destroy)
    ~ClonePtr()
    {
        destroyRawPtr();
    }
 
    // Copy ctor (calls (virtual) clone())
    ClonePtr(ClonePtr const& val)
    {
        rawptr_ = val.rawptr_->clone();
    }
 
    // Assignment in the same spirit as copy ctor
    ClonePtr< T >& operator=(ClonePtr 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_ = nullptr;
    }
};
 
}  // ns
 
#endif  // QWT3D_AUTOPTR_H