title: Can you invoke an instantiated object's class constructor explicity in C++?
body: <p>After creating a instance of a class, can we invoke the constructor explicitly?
  For example</p>
  
  <pre><code>class A{
      A(int a)
      {
      }
  }
  
  A instance;
  
  instance.A(2);
  </code></pre>
  
  <p>Can we do this?</p>