Class del_ptr_zero

extra/yassl/include/buffer.hpp:196–205

checked delete functor increases effeciency, no indirection on function call sets pointer to zero so safe for std conatiners

// checked delete functor increases effeciency, no indirection on function call
// sets pointer to zero so safe for std conatiners
struct del_ptr_zero
{
    template <typename T>
    void operator()(T*& p) const
    {
        T* tmp = 0;
        STL::swap(tmp, p);
        checked_delete(tmp); 
    }
};