template <typename T>
struct deep_ptr:
    public std::unique_ptr<T>
{
    using std::unique_ptr<T>::unique_ptr;

    deep_ptr() {}
    deep_ptr(deep_ptr<T> const& other)
    {
        this->reset(new T(*other.get()));
    }
    deep_ptr(std::unique_ptr<T> other):
        std::unique_ptr<T>( std::move(other) )
    {
    }
    deep_ptr<T>& operator=(deep_ptr<T> const& other)
    {
        this->reset(new T(*other.get()));
        return *this;
    }
};