在C中的以下陈述中哪一个更好用？
static const int var = 5;
要么
#define var 5
要么
enum { var = 5 };
我正在浏览一些Route netlink源代码.
我想弄清楚RTNLGRP_NEIGH的价值是什么
资料来源:http://lxr.free-electrons.com/source/include/linux/rtnetlink.h？v = 2.6.35#L550
541 /* RTnetlink multicast groups */
542 enum rtnetlink_groups {
543 RTNLGRP_NONE,
544 #define RTNLGRP_NONE RTNLGRP_NONE
545 RTNLGRP_LINK,
546 #define RTNLGRP_LINK RTNLGRP_LINK
547 RTNLGRP_NOTIFY,
548 #define RTNLGRP_NOTIFY RTNLGRP_NOTIFY
549 RTNLGRP_NEIGH,
550 #define RTNLGRP_NEIGH RTNLGRP_NEIGH
551 RTNLGRP_TC,
552 #define RTNLGRP_TC RTNLGRP_TC
553 RTNLGRP_IPV4_IFADDR,
554 #define RTNLGRP_IPV4_IFADDR RTNLGRP_IPV4_IFADDR
... ...
... ...
#define RTNLGRP_PHONET_IFADDR RTNLGRP_PHONET_IFADDR
585 RTNLGRP_PHONET_ROUTE,
586 #define RTNLGRP_PHONET_ROUTE RTNLGRP_PHONET_ROUTE
587 __RTNLGRP_MAX
588 };
589 #define RTNLGRP_MAX (__RTNLGRP_MAX - 1)
#define做的这个 …
"C接口和实现"显示了数据结构的一些有趣的使用模式,但我确信还有其他的.