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author | Rusty Russell <rusty@rustcorp.com.au> | 2012-02-22 14:59:32 +1030 |
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committer | Amitay Isaacs <amitay@gmail.com> | 2012-03-07 13:16:16 +1100 |
commit | 361f3ea9ee577c5a3e2fed687a0b417b257c31de (patch) | |
tree | 6d356c3aa64317c609ff4e208be76e18996a55f8 /lib/ccan/check_type/check_type.h | |
parent | 4f5412dda687c3ff76b426842bf284d01d56a997 (diff) | |
download | samba-361f3ea9ee577c5a3e2fed687a0b417b257c31de.tar.gz samba-361f3ea9ee577c5a3e2fed687a0b417b257c31de.tar.bz2 samba-361f3ea9ee577c5a3e2fed687a0b417b257c31de.zip |
lib/ccan: import failtest and required ccan modules for TDB2 unit tests.
New modules: failtest, list, time, read_write_all and tlist.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'lib/ccan/check_type/check_type.h')
-rw-r--r-- | lib/ccan/check_type/check_type.h | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/lib/ccan/check_type/check_type.h b/lib/ccan/check_type/check_type.h new file mode 100644 index 0000000000..b199347116 --- /dev/null +++ b/lib/ccan/check_type/check_type.h @@ -0,0 +1,63 @@ +#ifndef CCAN_CHECK_TYPE_H +#define CCAN_CHECK_TYPE_H +#include "config.h" + +/** + * check_type - issue a warning or build failure if type is not correct. + * @expr: the expression whose type we should check (not evaluated). + * @type: the exact type we expect the expression to be. + * + * This macro is usually used within other macros to try to ensure that a macro + * argument is of the expected type. No type promotion of the expression is + * done: an unsigned int is not the same as an int! + * + * check_type() always evaluates to 0. + * + * If your compiler does not support typeof, then the best we can do is fail + * to compile if the sizes of the types are unequal (a less complete check). + * + * Example: + * // They should always pass a 64-bit value to _set_some_value! + * #define set_some_value(expr) \ + * _set_some_value((check_type((expr), uint64_t), (expr))) + */ + +/** + * check_types_match - issue a warning or build failure if types are not same. + * @expr1: the first expression (not evaluated). + * @expr2: the second expression (not evaluated). + * + * This macro is usually used within other macros to try to ensure that + * arguments are of identical types. No type promotion of the expressions is + * done: an unsigned int is not the same as an int! + * + * check_types_match() always evaluates to 0. + * + * If your compiler does not support typeof, then the best we can do is fail + * to compile if the sizes of the types are unequal (a less complete check). + * + * Example: + * // Do subtraction to get to enclosing type, but make sure that + * // pointer is of correct type for that member. + * #define container_of(mbr_ptr, encl_type, mbr) \ + * (check_types_match((mbr_ptr), &((encl_type *)0)->mbr), \ + * ((encl_type *) \ + * ((char *)(mbr_ptr) - offsetof(enclosing_type, mbr)))) + */ +#if HAVE_TYPEOF +#define check_type(expr, type) \ + ((typeof(expr) *)0 != (type *)0) + +#define check_types_match(expr1, expr2) \ + ((typeof(expr1) *)0 != (typeof(expr2) *)0) +#else +#include <ccan/build_assert/build_assert.h> +/* Without typeof, we can only test the sizes. */ +#define check_type(expr, type) \ + BUILD_ASSERT_OR_ZERO(sizeof(expr) == sizeof(type)) + +#define check_types_match(expr1, expr2) \ + BUILD_ASSERT_OR_ZERO(sizeof(expr1) == sizeof(expr2)) +#endif /* HAVE_TYPEOF */ + +#endif /* CCAN_CHECK_TYPE_H */ |