Fixed static method

src/random.hpp

@@ -32,7 +32,7 @@ namespace sc {
             }
 
             template <typename T, typename Iter>
-            T choice(Iter from, Iter to) {
+            static T choice(Iter from, Iter to) {
                 std::uniform_int_distribution<int> dist {0, static_cast<int>(to - from) - 1};
                 return *(from + dist(instance()._reng));
             }