Add missing #include <function>

This fixes compilation using libc++ instead of libstdc++
5 years ago · be4901ce2c
1 changed files with 1 additions and 0 deletions
--- a/chrono/timespan.h
+++ b/chrono/timespan.h
@ -4,6 +4,7 @@
 #include "../conversion/types.h"
 #include "../global.h"

+#include <functional>
 #include <limits>
 #include <string>