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utils: add _NM_UTILS_MACRO_FIRST and _NM_UTILS_MACRO_REST macros

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Signed-off-by: Thomas Haller <thaller@redhat.com>
This commit is contained in:
Thomas Haller 2014-07-15 16:23:13 +02:00
parent 9f832d99be
commit 65c43a680e
1 changed files with 17 additions and 0 deletions
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17
include/nm-utils-internal.h
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@ -23,5 +23,22 @@
#define __NM_UTILS_INTERNAL_H__
/* http://stackoverflow.com/a/11172679 */
#define _NM_UTILS_MACRO_FIRST(...) __NM_UTILS_MACRO_FIRST_HELPER(__VA_ARGS__, throwaway)
#define __NM_UTILS_MACRO_FIRST_HELPER(first, ...) first
#define _NM_UTILS_MACRO_REST(...) __NM_UTILS_MACRO_REST_HELPER(__NM_UTILS_MACRO_REST_NUM(__VA_ARGS__), __VA_ARGS__)
#define __NM_UTILS_MACRO_REST_HELPER(qty, ...) __NM_UTILS_MACRO_REST_HELPER2(qty, __VA_ARGS__)
#define __NM_UTILS_MACRO_REST_HELPER2(qty, ...) __NM_UTILS_MACRO_REST_HELPER_##qty(__VA_ARGS__)
#define __NM_UTILS_MACRO_REST_HELPER_ONE(first)
#define __NM_UTILS_MACRO_REST_HELPER_TWOORMORE(first, ...) , __VA_ARGS__
#define __NM_UTILS_MACRO_REST_NUM(...) \
__NM_UTILS_MACRO_REST_SELECT_20TH(__VA_ARGS__, \
TWOORMORE, TWOORMORE, TWOORMORE, TWOORMORE, TWOORMORE,\
TWOORMORE, TWOORMORE, TWOORMORE, TWOORMORE, TWOORMORE,\
TWOORMORE, TWOORMORE, TWOORMORE, TWOORMORE, TWOORMORE,\
TWOORMORE, TWOORMORE, TWOORMORE, ONE, throwaway)
#define __NM_UTILS_MACRO_REST_SELECT_20TH(a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20, ...) a20
#endif