primitive logging in c++

gistfile1.cpp

// debug.h
#include <iostream>
#define NDEBUG 1
#ifdef NDEBUG
#define debug if(1); else std::cout
#else
#define debug std::cout
#endif

using namespace std;

int main(int argc, char const *argv[])
{
    // 'debug' may be switched off at compile time
    debug << "debug1"; 
    debug << "debug2" << endl;
    // standard streams 
    cout << "info" << endl; 
    cout << "warning" << endl;
    cerr << "error" << endl; 
    return 0;
}