timer: add assertions to test

1 files changed, 7 insertions, 0 deletions

diff --git a/timer.h b/timer.h
index ce0e629..15e0497 100644
--- a/timer.h
+++ b/timer.h
@@ -2,6 +2,7 @@
 #include <ctime>
 
 namespace timer {
+/// A minimal Linux watch clock.
 struct timer {
   constexpr timer() = default;
 
@@ -17,6 +18,10 @@ struct timer {
                (end.tv_nsec - m_start.tv_nsec);
   }
 
+  constexpr void reset() {
+    m_nanos = 0;
+  }
+
   constexpr double as_sec() const {
     return as_msec() / 1000.0;
   }
@@ -36,6 +41,8 @@ struct timer {
   std::uint64_t m_nanos{0};
 };
 
+/// A scoped timer to automatically start / stop a watch clock in the scope the
+/// scoped_timer lives.
 struct scoped_timer {
   explicit scoped_timer(timer& t) : m_timer(t) {
     m_timer.start();