Changed choice function to use std::vector

src/random.hpp

@@ -2,6 +2,7 @@
 #define RANDOM_H_
 
 #include <random>
+#include <vector>
 
 namespace sc {
 
@@ -24,10 +25,10 @@ namespace sc {
             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);
+            template <typename T>
+            static T choice(const std::vector<T>& vec) {
+                std::uniform_int_distribution<int> dist {0, vec.size() - 1};
+                return vec[dist(instance()._reng)];
             }
 
         private: