update dir

using/using_derived.cpp

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+/**
+ * @file using_derived.cpp
+ * @brief 函数重装
+ * @author 光城
+ * @version v1
+ * @date 2019-08-07
+ */
+
+#include <iostream>
+using namespace std;
+
+class Base{
+    public:
+        void f(){ cout<<"f()"<<endl;
+        }
+        void f(int n){
+            cout<<"Base::f(int)"<<endl;
+        }
+};
+
+class Derived : private Base {
+    public:
+        using Base::f;
+        void f(int n){
+            cout<<"Derived::f(int)"<<endl;
+        }
+};
+
+int main()
+{
+    Base b;
+    Derived d;
+    d.f();
+    d.f(1);
+    return 0;
+}