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ccan/array_size.h
26 строк
876 B
Parav Pandit
ccan: Add array_size.h file
04 июн 2018, 17:38
04 июн 2018, 17:38
61c02e4
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/* CC0 (Public domain) - see LICENSE file for details */ #ifndef CCAN_ARRAY_SIZE_H #define CCAN_ARRAY_SIZE_H #include "config.h" #include <ccan/build_assert.h> /** * ARRAY_SIZE - get the number of elements in a visible array * @arr: the array whose size you want. * * This does not work on pointers, or arrays declared as [], or * function parameters. With correct compiler support, such usage * will cause a build error (see build_assert). */ #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + _array_size_chk(arr)) #if HAVE_BUILTIN_TYPES_COMPATIBLE_P && HAVE_TYPEOF /* Two gcc extensions. * &a[0] degrades to a pointer: a different type from an array */ #define _array_size_chk(arr) \ BUILD_ASSERT_OR_ZERO(!__builtin_types_compatible_p(typeof(arr), \ typeof(&(arr)[0]))) #else #define _array_size_chk(arr) 0 #endif #endif /* CCAN_ALIGNOF_H */