结构和类又非常多的相似之处，如结构可以实现界面，和可以拥有和类一样的成员。结构与类也有一些重要的区

别：结构是值类型，而不是引用类型，所以不支持继承！结构被存在堆栈中或者是内联。结构在精心下可以提高

存储效能-structure and category there are a lot of similarities, such as the interface structure can be achieved, and can have and the members of the same category. The class structure are some important differences between the two : the structure is the type of value, rather than the type used, they did not support inheritance! There are structural stack or Intranet. Under the careful structure can improve storage efficiency