implicitly declared special member functions
<p>There are four special functions fundamentally implicitly declared.</p>

<ol>
<li>Default constructor</li>
<li>Default destructor</li>
<li>Default assignment operator</li>
<li>Default member-wise copy operator</li>
</ol>

<p>Question:</p>

<p>If any one of them is defined by user, [eg: Destructor ] rest of the three functions will not get declared. Is that the correct?
 or 
it is applicable only to default constructor, and copy Constructor?</p>
