Adds mean and makes median more generic

EyeRecToo/src/utils.h

@@ -100,12 +100,17 @@ void set(const QSettings* settings, const QString key, T& v)
 void loadSoundEffect(const QString& fileName, const QString& exeDir, QSoundEffect& effect);
 
 template <typename T>
-double median(std::vector<T> v)
+double median(T v)
 {
-    int size = static_cast<int>(v.size());
     std::sort(v.begin(), v.end());
-    int mid = size / 2;
-    return size % 2 == 0 ? (v[mid] + v[mid - 1]) / 2 : v[mid];
+    size_t mid = v.size() / 2;
+    return v.size() % 2 == 0 ? (v[mid] + v[mid - 1]) / 2 : v[mid];
+}
+
+template <typename T>
+double mean(T v)
+{
+    return std::accumulate(v.begin(), v.end(), 0.0) / v.size();
 }
 
 template <typename T>