title: C4244: '+=' : conversion from 'std::streamsize' to 'size_t', possible loss of data
body: <p>I have migrated my VC++ project form VS2008 to VS2013 and got some warnings like:</p>
  
  <blockquote>
    <p><code>C4244: '+=' : conversion from 'std::streamsize' to 'size_t', possible loss of data.</code> </p>
  </blockquote>
  
  <p>How can I resolve these type of warnings?</p>