--- nono/lib/fixedqueue.h	2026/04/29 17:05:26	1.1.1.10
+++ nono/lib/fixedqueue.h	2026/04/29 17:05:47	1.1.1.11
@@ -130,6 +130,21 @@ class FixedQueue final : private std::ve
 		}
 	}
 
+	// 移動平均値を返す。(T が数値型のときに限る)
+	T GetMovingAverage() const
+	{
+		static_assert(std::is_arithmetic<T>::value, "T must be arithmetic");
+
+		if (Empty()) {
+			return 0;
+		}
+		T sum = 0;
+		for (uint i = 0; i < length; i++) {
+			sum += Peek(i);
+		}
+		return sum / length;
+	}
+
  private:
 	uint start {};				// 開始位置
 	uint length {};				// 現在有効な長さ