first commit

src/random.hpp

@@ -0,0 +1,45 @@
+#ifndef RANDOM_H_
+#define RANDOM_H_
+
+#include <random>
+
+namespace sc {
+
+    class random {
+        public:
+            static random& instance() { return singleton; }
+
+            // forbid copying
+            random(const random&) = delete;
+            random& operator=(const random&) = delete;
+
+            // forbid moving
+            random(random&&) = delete;
+            random& operator=(random&&) = delete;
+
+            std::default_random_engine& engine() { return _reng; }
+
+            bool random_bool();
+            int random_int(int from, int to);
+            double random_double();
+            double random_double(double from, double to);
+
+            template <typename T, typename Iter>
+            T choice(Iter beg, Iter end) {
+                std::uniform_int_distribution<int> dist {0, end - beg - 1};
+                return beg + dist(_reng);
+            }
+
+        private:
+            static random singleton;
+
+            random() = default;
+            ~random() = default;
+
+            std::random_device _rdev {};
+            std::default_random_engine _reng {_rdev()};
+    };
+
+}
+
+#endif // RANDOM_H_