#define WRITE_ONCE(x, val) \
({ \
union { typeof(x) __val; char __c[1]; } __u = \
{ .__val = (val) }; \
__write_once_size(&(x), __u.__c, sizeof(x)); \
__u.__val; \
})
为什么是一个 union ？而不能直接赋值？
This topic created in 1242 days ago, the information mentioned may be changed or developed.
1
Select Language