title: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
body: <p>When I compile my C++ program using g++</p>
  
  <pre><code>warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
           for ( int i=0; i&lt; myvec-&gt;size(); i++ ){
                                         ^
  </code></pre>
  
  <p>where <code>myvec</code> is an object of <code>std::vector&lt;float&gt;</code>.</p>
  
  <p>For iterating over elements in std::vector, shall I need to deal with the warning? Thanks.</p>