Method swap

libCacheSim/dataStructure/sparsepp/spp_smartptr.h:45–45

    spp_sptr& operator=(const spp_sptr &o)  { reset(o._p); return *this; }
    T* get() const                          { return _p; }
    void swap(spp_sptr &o)                  { T *tmp = _p; _p = o._p; o._p = tmp; }
    void reset(const T *p = 0)             
    { 
        if (p == _p)