map协议源代码，au部分，方便程序员加快map协议的开发速度-map agreement source code, au, programmers to facilitate an agreement to accelerate the development map speed

如果程序员没有显示定义复制构造函数，编译系统就会自动生成一个默认形式的复制构造函数，其功能是创建对象时把已知的数据成员都复制到创建的新对象中。-If the programmer does not define the copy constructor, the compiler system will automatically generate a default form of copy constructor, and its function is to create objects