text: // This file is part of libigl, a simple c++ geometry processing library.
  // 
  // Copyright (C) 2013 Alec Jacobson <alecjacobson@gmail.com>
  // 
  // This Source Code Form is subject to the terms of the Mozilla Public License 
  // v. 2.0. If a copy of the MPL was not distributed with this file, You can 
  // obtain one at http://mozilla.org/MPL/2.0/.
  #ifndef IGL_MATLAB_MEX_STREAM_H
  #define IGL_MATLAB_MEX_STREAM_H
  #include <iostream>
  namespace igl
  {
    namespace matlab
    {
      // http://stackoverflow.com/a/249008/148668
      
      // Class to implement "cout" for mex files to print to the matlab terminal
      // window.
      //
      // Insert at the beginning of mexFunction():
      //  MexStream mout;
      //  std::streambuf *outbuf = std::cout.rdbuf(&mout); 
      //  ...
      //  ALWAYS restore original buffer to avoid memory leak problems in matlab
      //  std::cout.rdbuf(outbuf);
      //
      class MexStream : public std::streambuf
      {
        public:
        protected:
          inline virtual std::streamsize xsputn(const char *s, std::streamsize n); 
          inline virtual int overflow(int c = EOF);
      }; 
    }
  }
  
  // Implementation 
  #include <mex.h>
  inline std::streamsize igl::matlab::MexStream::xsputn(
    const char *s, 
    std::streamsize n) 
  {
    mexPrintf("%.*s",n,s);
    mexEvalString("drawnow;"); // to dump string.
    return n;
  }
  
  inline int igl::matlab::MexStream::overflow(int c) 
  {
      if (c != EOF) {
        mexPrintf("%.1s",&c);
        mexEvalString("drawnow;"); // to dump string.
      }
      return 1;
  }
  #endif
  