Sync public subset from Flux (private)

include/utils/random.h

@@ -0,0 +1,37 @@
+#pragma once
+
+#include "./core/omp_config.h"
+#include <random>
+
+namespace utils{
+
+    // Shared engine
+    inline std::mt19937& rng() {
+        static std::random_device rd;
+        static std::mt19937 gen(rd());
+        return gen;
+    }
+
+    // Integral overload
+    template <
+        typename T,
+        typename std::enable_if<std::is_integral<T>::value, int>::type = 0
+    >
+    T random(T low, T high) {
+        std::uniform_int_distribution<T> dist(low, high);
+        return dist(rng());
+    }
+
+    // Floating-point overload
+    template <
+        typename T,
+        typename std::enable_if<std::is_floating_point<T>::value, int>::type = 0
+    >
+    T random(T low, T high) {
+        std::uniform_real_distribution<T> dist(low, high);
+        return dist(rng());
+    }
+
+
+} // end namespace utils
+