countof.h File Reference

macro-based countof implementation More...

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Macros
#define	_COUNTOF_IS_ARRAY(x)
#define	countof(array)

Detailed Description

macro-based countof implementation

Helper macro to count the number of elements in an array. Passing a pointer is rejected at compile time.

Author

Irving Wang (irvin.nosp@m.gw@p.nosp@m.urdue.nosp@m..edu)

Macro Definition Documentation

_COUNTOF_IS_ARRAY

#define _COUNTOF_IS_ARRAY

(

x

)

Value:

(!__builtin_types_compatible_p(typeof(x), typeof(&(x)[0])))

countof

#define countof

(

array

)

Value:

    ({ \
        static_assert(_COUNTOF_IS_ARRAY(array), \
        "countof() argument must be an array"); \
        (sizeof(array) / sizeof((array)[0])); \
    }) \