update

basic_content/abstract/derived_full.cpp

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+/**
+ * @file derived_full.cpp
+ * @brief 完整示例！抽象类由派生类继承实现！
+ * @author 光城
+ * @version v1
+ * @date 2019-07-20
+ */
+
+#include<iostream> 
+using namespace std; 
+
+class Base 
+{ 
+    int x; 
+    public: 
+    virtual void fun() = 0; 
+    int getX() { return x; } 
+}; 
+
+class Derived: public Base 
+{ 
+    int y; 
+    public: 
+    void fun() { cout << "fun() called"; }  ///< 实现了fun()函数
+}; 
+
+int main(void) 
+{ 
+    Derived d; 
+    d.fun(); 
+    return 0; 
+}