摸板的一些内容

1.   template<typename T>  

   template<class T >

<c++程序设计>

区别在于,typename 的概念比class更宽泛,不仅包括由类定义引进的类型的名字,还包括语言的内部类型,枚举,typedef引进的名字etc

<MSDN>

typename identifier;

Use this keyword only in template definitions. This keyword tells the compiler that an unknown identifier is a type. For example:

template<class T> class X {
   typename T::Y;      // treat Y as a type
   
   Y m_y;
};

This keyword can also be used in place of class in template parameter lists. For example, the following statements are identical:

template<class T1, class T2>...
template<typename T1, typename T2>...