Question

Is there any logging functionality in c++ which can be enabled by setting debug=True or something like that to print debug messages to stdout ?

Answer 1

The usual trick goes like this:

void writeLog(const char* message); // Define elsewhere to do your logging

#ifdef DEBUG
#define Log(x) writeLog(x)
#else
#define Log(x)
#endif

// Somewhere in your main code
Log("This message is only seen if DEBUG is defined at compilation");