support bazel complie this project and format code.

learn_class/modern_cpp_30/literalAssert/overridefinal.cpp

@@ -0,0 +1,29 @@
+//
+// Created by light on 19-12-25.
+//
+
+class A {
+public:
+  virtual void foo();
+  virtual void bar();
+  void foobar();
+};
+
+class B : public A {
+public:
+  void foo() override;       // OK
+  void bar() override final; // OK
+                             // void foobar() override;
+  //   非虚函数不能  override
+};
+
+class C final : public B {
+public:
+  void foo() override; // OK
+                       // void bar() override;
+  //  final  函数不可  override
+};
+
+class D : public C {
+  //  错误：final  类不可派生
+};