why we use Using Declaration in derived class?
<blockquote>
  <p><strong>Possible Duplicate:</strong><br>
  <a href="http://stackoverflow.com/questions/1896830/why-shall-i-use-the-using-keyword-to-access-my-base-class-method">Why shall I use the &ldquo;using&rdquo; keyword to access my base class method?</a>  </p>
</blockquote>



<p><code>using</code> declaration introduces a name of data member or member function from a base class into the scope of derived class which is implicitly accomplished when we derive a class from base class, then what is the utility of using "using declaration"?</p>

<p>i want to know in depth the use of using declaration in classes in c++.</p>
