std_pattern

代码说明：

  单件模块，包括单件类和单件宏，使用单件宏能够从一个类(orgClassName)派生出一个单件类(newClassName)，并保持基类的功能。 (Single module, including a single category and single-hong, the use of a single category from a macro (orgClassName) derived from a single category (newClassName), and maintain the functions of base class.)