title: Concat string in C++(STL)
body: <p>i have code like this </p>
  
  <pre><code>string xml_path(conf("CONFIG"));
  
  xml_path+=FILE_NAME;
  </code></pre>
  
  <p>Where,
  conf function returns <code>char *</code> and FILE name is <code>const char *</code></p>
  
  <p>I want to combine it to one line like  </p>
  
  <pre><code>xml_path(conf("CONFIG")).append(FILE_NAME) 
  </code></pre>
  
  <p>how do i do it?</p>
  
  <p>any suggestions ??</p>