diff options
| author | Martin Willi <martin@revosec.ch> | 2014-07-04 14:35:27 +0200 |
|---|---|---|
| committer | Martin Willi <martin@revosec.ch> | 2014-08-25 09:48:53 +0200 |
| commit | bb6be261974788d971226d7508bcbc49af86e96e (patch) | |
| tree | 9630c61844572f80dceffb2c705d86fc2f540f22 /src/libstrongswan/utils/utils.h | |
| parent | 8986e2da47ec6e5a57483a1034d3332f8fdd2533 (diff) | |
| download | strongswan-bb6be261974788d971226d7508bcbc49af86e96e.tar.bz2 strongswan-bb6be261974788d971226d7508bcbc49af86e96e.tar.xz | |
utils: Add some initial build time assertion macros
These are useful to assert constants during build time. We evaluate the
expression to 0 when valid, so we can safely use the evaluated value.
Diffstat (limited to 'src/libstrongswan/utils/utils.h')
| -rw-r--r-- | src/libstrongswan/utils/utils.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/src/libstrongswan/utils/utils.h b/src/libstrongswan/utils/utils.h index 1b822dd61..cb60c6e3e 100644 --- a/src/libstrongswan/utils/utils.h +++ b/src/libstrongswan/utils/utils.h @@ -60,6 +60,20 @@ #define BUF_LEN 512 /** + * Build assertion macro for integer expressions, evaluates to 0 + */ +#define BUILD_ASSERT(x) (sizeof(char[(x) ? 0 : -1])) + +/** + * Build time check to assert a is an array, evaluates to 0 + * + * The address of an array element has a pointer type, which is not compatible + * to the array type. + */ +#define BUILD_ASSERT_ARRAY(a) \ + BUILD_ASSERT(!__builtin_types_compatible_p(typeof(a), typeof(&(a)[0]))) + +/** * General purpose boolean type. */ #ifdef HAVE_STDBOOL_H |