Added is_zero and is_not_zero to rak::timer.

Author: rakshasa

rak/timer.h

@@ -49,6 +49,9 @@ class timer {
   timer(int64_t usec = 0) : m_time(usec) {}
   timer(timeval tv) : m_time((int64_t)(uint32_t)tv.tv_sec * 1000000 + (int64_t)(uint32_t)tv.tv_usec % 1000000) {}
 
+  bool                is_zero() const                    { return m_time == 0; }
+  bool                is_not_zero() const                { return m_time != 0; }
+
   int32_t             seconds() const                    { return m_time / 1000000; }
   int32_t             seconds_ceiling() const            { return (m_time + 1000000 - 1) / 1000000; }
   int64_t             usec() const                       { return m_time; }