Files are now in a src directory and I'm using a src/meson.build and tests/meson.build to specify what to build.

src/rand.cpp

@@ -0,0 +1,13 @@
+#include "rand.hpp"
+
+namespace Random {
+  std::random_device RNG;
+  std::mt19937 GENERATOR(RNG());
+
+
+  std::chrono::milliseconds milliseconds(int from, int to) {
+    int tick = Random::uniform_real(float(from), float(to));
+    return std::chrono::milliseconds{tick};
+  }
+
+}