title: C++ destroy object
body: <p>I am seriously understand the threaten from the memory leak. </p>
  
  <p>I know if I create a pointer, I need to delete it.</p>
  
  <p>But how about I new an object?</p>
  
  <p>Do i need to destroy a by myself?</p>
  
  <p>Does c++ could recollect it by it self?</p>