support bazel complie this project and format code.

codingStyleIdioms/1_classInitializers/1.1_nest.cpp

@@ -0,0 +1,53 @@
+/* 1.1_类之间嵌套.cpp */
+//
+// Created by light on 19-12-9.
+//
+
+#include <iostream>
+
+class Animal {
+public:
+    Animal() {
+        std::cout << "Animal() is called" << std::endl;
+    }
+
+    Animal(const Animal &) {
+        std::cout << "Animal (const Animal &) is called" << std::endl;
+    }
+
+    Animal &operator=(const Animal &) {
+        std::cout << "Animal & operator=(const Animal &) is called" << std::endl;
+        return *this;
+    }
+
+    ~Animal() {
+        std::cout << "~Animal() is called" << std::endl;
+    }
+};
+
+class Dog {
+public:
+    // 第一种： 使用初始化列表。
+    Dog(const Animal &animal) : __animal(animal) {
+        std::cout << "Dog(const Animal &animal) is called" << std::endl;
+    }
+    // 第二种：构造函数赋值来初始化对象。
+//    Dog(const Animal &animal) {
+//        __animal = animal;
+//        std::cout << "Dog(const Animal &animal) is called" << std::endl;
+//    }
+    ~Dog() {
+        std::cout << "~Dog() is called" << std::endl;
+    }
+
+private:
+    Animal __animal;
+};
+
+int main() {
+    Animal animal;
+    std::cout << std::endl;
+    Dog d(animal);
+    std::cout << std::endl;
+    return 0;
+}