Redirect debug output to any ostream.

You can write the debug output to any given ostream. The following example opens a file log and uses it to write its debug output to.

Compile as: g++ -DCWDEBUG log_file.cc -lcwd -o log_file

#include <fstream>
#include "debug.h"    // See tutorial 2.
 
int main()
{
  Debug(main_reached());
  Debug(dc::notice.on());
  Debug(libcw_do.on());
 
#ifdef CWDEBUG
  std::ofstream file;
  file.open("log");
#endif
 
  // Set the ostream related with libcw_do to `file':
  Debug(libcw_do.set_ostream(&file));
 
  Dout(dc::notice, "Hippopotamus are heavy");
}

Debug code like the definition of the debug file file, should be put between #ifdef CWDEBUG ... #endif as usual. This isn't needed for Debug() or Dout() because these macros are automatically replaced with white space when CWDEBUG is not defined.

Continue with Tutorial 4: Management Of CWDEBUG.