c++ - 未初始化的枚举器默认值

Question

假设我们有以下声明

enum visibility
{
   On  = 0,
   Off = 1,
   maxVisibility
};

C++11/C++0x标准中maxVisibility枚举数2的保证值是？

Answer 1

是的，这是有保证的。

§ 7.2.2

If the first enumerator has no initializer,the value of the corresponding constant is zero. An enumerator-definition without an initializer gives the enumerator the value obtained by increasing the value of the previous enumerator by one.