Re: why boost:shared_ptr so slower?

"Juha Nieminen" <nospam@thanks.invalid> wrote in message
news:gqyjm.62$lD3.48@read4.inet.fi...


Perhaps something along the lines of:
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struct ref_base {
  unsigned m_count;
  virtual ~ref_base() = 0;
};

ref_base::~ref_base() {}

template<typename T>
class ptr {
  ref_base* m_ptr;

  void prv_init() const {
    if (m_ptr) m_ptr->m_count = 1;
  }

  void prv_inc() const {
    if (m_ptr) ++m_ptr->m_count;
  }

  void prv_dec() const {
    if (m_ptr) {
      if (! --m_ptr->m_count) {
        delete m_ptr;
      }
    }
  }

public:
  ptr(T* ptr = NULL) : m_ptr(static_cast<ref_base*>(ptr)) {
    prv_init();
  }

  ptr(ptr const& rhs) : m_ptr(rhs.m_ptr) {
    prv_inc();
  }

  ~ptr() {
    prv_dec();
  }

  ptr& operator = (ptr const& rhs) {
    rhs.prv_inc();
    prv_dec();
    m_ptr = rhs.m_ptr;
    return *this;
  }

  T* operator ->() {
    return static_cast<T*>(m_ptr);
  }
};
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