title: R check doesn't like std:cout (C++)
body: <p>I'm trying to submit a package to CRAN which contains C++ code (I have no clue about C++, the cpp files were written by somebody else). </p>
  
  <p>The R check complains about <strong>‘std::cout’ (C++)
  Compiled code should not call entry points which might terminate R nor
  write to stdout/stderr instead of to the console, nor the C RNG</strong></p>
  
  <p>I found in the code the following command:</p>
  
  <pre><code> integrate_const(stepper_type( default_error_checker&lt; double &gt;( abs_error , rel_error ) ),
                  mDifEqn,
                  x,
                  0.0,
                  (precipitationLength * timeStep), 
                  timeStep,
                  streaming_observer(std::cout) ); 
  </code></pre>
  
  <p>I guess R (CRAN) expects something else rather than std::cout... but what?</p>