Util/Random: Add randtime(Milliseconds const&, Milliseconds const&) t…

…o supersede urandms(uint32,uint32) for scripts being ported to std::chrono.

src/common/Utilities/Random.cpp

@@ -61,6 +61,14 @@ float frand(float min, float max)
     return float(GetRng()->Random() * (max - min) + min);
 }
 
+Milliseconds randtime(Milliseconds const& min, Milliseconds const& max)
+{
+    long long diff = max.count() - min.count();
+    ASSERT(diff >= 0);
+    ASSERT(diff <= (uint32)-1);
+    return min + Milliseconds(urand(0, diff));
+}
+
 uint32 rand32()
 {
     return GetRng()->BRandom();

src/common/Utilities/Random.h

@@ -19,6 +19,7 @@
 #define Random_h__
 
 #include "Define.h"
+#include "Duration.h"
 #include <limits>
 #include <random>
 
@@ -34,6 +35,9 @@ uint32 urandms(uint32 min, uint32 max);
 /* Return a random number in the range 0 .. UINT32_MAX. */
 uint32 rand32();
 
+/* Return a random time in the range min..max (up to millisecond precision). Only works for values where millisecond difference is a valid uint32. */
+Milliseconds randtime(Milliseconds const& min, Milliseconds const& max);
+
 /* Return a random number in the range min..max */
 float frand(float min, float max);