shihongzhi

#include <sys/time.h>                // for gettimeofday()

class StopWatch {
  timeval     started;
  std::string msg;
  
public:
  StopWatch(const std::string& m): msg(m)
    { gettimeofday(&started, NULL); }

shihongzhi

One-line Tree in Python

Using Python's built-in defaultdict we can easily define a tree data structure:

def tree(): return defaultdict(tree)

That's it!