add swap_n to array

c_os/user/lib/Array.h

@@ -20,10 +20,6 @@ public:
     constexpr Iterator begin() const { return this->begin(); }
     constexpr Iterator end() const { return this->end(); }
 
-    constexpr unsigned int size() const {
-        return N;
-    }
-
     T& operator[](std::size_t i) {
         return this->buf[i];
     }
@@ -37,6 +33,19 @@ public:
             std::swap(this->buf[i], other[i]);
         }
     }
+
+    // Array& other has to have size n:
+    // arr1.swap_n<5>(arr2) => arr2 has size 5, arr1 has size >= 5
+    template<std::size_t n>
+    void swap_n(Array<Type, n>& other) {
+        for (std::size_t i = 0; i < n; ++i) {
+            std::swap(this->buf[i], other[i]);
+        }
+    }
+
+    constexpr std::size_t size() const {
+        return N;
+    }
 };
 
 #endif