title: Use a C++ compiled code within a R Shiny app in shinyapp.io
body: <p>I have developed a ShinyApp that is built around a C++ program. In short, what the app does is :</p>
  
  <ul>
  <li>provides a nice interface to setup the parameters (in a text file) for the C++ app</li>
  <li>runs the C++ compiled code using the <code>system(...)</code> command</li>
  <li>displays the output of the C++ code using <code>ggplot2</code></li>
  </ul>
  
  <p>The C++ compiled code is stored into the <code>www</code> folder. Locally it works fine, but when I load the app to the shinyapp website (I have a free subscription), I got the following error:</p>
  
  <p><code>sh: 1: ./a.out: Permission denied</code></p>
  
  <p>with <code>a.out</code> being my compile c++ code. Any idea if</p>
  
  <ol>
  <li>I am doing something wrong? </li>
  <li>It is possible call a compiled c++ code within shinyapp.io? </li>
  </ol>