C++中， 结构体外定义位域有什么好处？

Question

比如

uint8 bPendingNetUpdate:1;

取代bool型变量。

实际上这个东西真地只占一个bit吗？

Answer 1

occupies one bit, but the structure will have padding for memory alignment, so just one bit field does not actually save memory. .
Being more compact will save memory. For example, connecting several flag variables of this type will definitely save memory than bool