Added iterator-based choice function

src/random.hpp

@@ -31,6 +31,12 @@ namespace sc {
                 return vec[dist(instance()._reng)];
             }
 
+            template <typename T, typename Iter>
+            T choice(Iter from, Iter to) {
+                std::uniform_int_distribution<int> dist {0, static_cast<int>(to - from) - 1};
+                return *(from + dist(instance()._reng));
+            }
+
         private:
             static random singleton;