title: In what cases should I use memcpy over standard operators in C++?
body: <p>When can I get better performance using <code>memcpy</code> or how do I benefit from using it?
  For example: </p>
  
  <pre><code>float a[3]; float b[3];
  </code></pre>
  
  <p>is code:</p>
  
  <pre><code>memcpy(a, b, 3*sizeof(float));
  </code></pre>
  
  <p><em>faster</em> than this one?</p>
  
  <pre><code>a[0] = b[0];
  a[1] = b[1];
  a[2] = b[2];
  </code></pre>