模板是C++支持参数化多态的工具，使用模板可以使用户为类或者函数声明一种一般模式，使得类中的某些数据成员或者成员函数的参数、返回值取得任意类型。(The template is C++ supports parametric polymorphism tool, can be used as a general user mode or function declaration using a template, the parameters, some data members of the class or member function returns the value of obtaining any type.)