update C overview, rtti.md

Author: icecoobe

docs/c-cpp/basics/rtti.md

@@ -0,0 +1,83 @@
+# RTTI - Run Time Type Information
+
+// Run Time Type Information
+``` cpp
+#include <ios>
+#include <iostream>
+using namespace std;
+class Base
+{
+public:
+    Base() { cout << __FUNCTION__ << endl; }
+    virtual ~Base() { cout << __FUNCTION__ << endl; }
+    virtual void f() 
+    { 
+        cout << "Base" << __FUNCTION__ << endl; 
+    }
+};
+class Derived : public Base
+{
+public:
+    Derived() { cout << __FUNCTION__ << endl; }
+    ~Derived() { cout << __FUNCTION__ << endl; }
+    
+    void f() 
+    { 
+        cout << "Derived-" << __FUNCTION__ << endl;  
+    }
+};
+class Derived2 : public Derived
+{
+public:
+    Derived2() { cout << __FUNCTION__ << endl; }
+    ~Derived2() { cout << __FUNCTION__ << endl; }
+    void f()  
+    { 
+        cout << "Derived2-" << __FUNCTION__ << endl; 
+    }
+};
+int main(void)
+{
+    Derived* p = new Derived2();
+    cout << "-------------------" << endl;
+    p->f();
+    cout << "-------------------" << endl;
+    auto p2 = dynamic_cast<Derived2*>(p);
+    auto p3 = dynamic_cast<Base*>(p2);
+    cout << sizeof(p) << ", " 
+        << typeid(p).name() << ", " 
+        << std::hex << typeid(p).hash_code() << endl;
+    cout << "p2: " << typeid(p2).name() << ", " 
+        << std::hex << typeid(p2).hash_code() << endl;
+    cout << "p3: " << typeid(p3).name() << ", " 
+        << std::hex << typeid(p3).hash_code() << endl;
+    cout << sizeof(*p) << ", " 
+        << typeid(*p).name() << ", " 
+        << std::hex << typeid(*p).hash_code() << endl;
+    cout << "-------------------" << endl;
+    delete p;
+    cout << "-------------------" << endl;
+    return 0;
+}
+```
+
+!!! experiment "Output"
+    ```cpp
+    Base
+    Derived
+    Derived2
+    -------------------
+    Derived2-f
+    -------------------
+    8, P7Derived, 9a7969d972aa52f7
+    p2: P8Derived2, 16a9329eaa369fd5
+    p3: P4Base, 11468d01f070011b
+    8, 8Derived2, f3ec1aaa6ce2faa5
+    -------------------
+    ~Derived2
+    ~Derived
+    ~Base
+    -------------------
+    ```
+
+---

docs/c-cpp/c/00.overview.md

@@ -19,4 +19,15 @@ C语言诞生于上个世界70年代初期，由Dennis Ritchie在贝尔实验室
 他晚年还编写了《Unix传奇》一书。
 
 C语言对于后续的编程语言影响深远，C++、C#、Java、JavaScript、Objective-C等语言都直接或间接地受到了C语言的影响。<br>
-K&R TCPL一书中的Hello World程序成为了编程入门的经典示例。<br>
+K&R TCPL一书中的Hello World程序成为了编程入门的经典示例。<br>
+
+## 编码规范
+
+我个人比较喜欢[OpenResty的编码规范](https://openresty.org/cn/c-coding-style-guide.html)
+
+## 推荐内容
+
+- [C程序设计语言 K&R TCPL](https://book.douban.com/subject/1139336/)
+- [C程序设计语言（中文版）](https://www.learncs.site/assets/files/c-programming-language-2nd-edition-simple-chinese-4ca79b68a8a3542f3e951afe6d1352b1.pdf) 
+- [浙江大学翁恺教你C语言程序设计](https://www.bilibili.com/video/BV1dr4y1n7vA/?spm_id_from=333.337.search-card.all.click)
+- [极客时间 - 深入 C 语言和程序运行原理](https://time.geekbang.org/column/intro/100100701?utm_campaign=geektime_search&utm_content=geektime_search&utm_medium=geektime_search&utm_source=geektime_search&utm_term=geektime_search&tab=catalog)

mkdocs.yml

@@ -156,6 +156,7 @@ nav:
         - virtual: c-cpp/basics/virtual.md
         - final: c-cpp/basics/final.md
         - Pointer and Reference: c-cpp/basics/pointer_and_ref.md
+        - RTTI: c-cpp/basics/rtti.md
     - Design Pattern:
       - Template Method: c-cpp/design_pattern/template_method.md
     - Build: c-cpp/build.md