Sizes

Array and member size helpers. More...

Macros
#define	ARRAY_LENGTH(array)   (sizeof((array)) / sizeof((array)[0]))
	Calculate the length of an array, based on the size of the element type.
#define	STATIC_ARRAY_LENGTH(type, array)   (sizeof((type[])array) / sizeof(type))
	Get the number of elements of an array literal, as a compile-time constant.
#define	MEMBER_SIZE(type, member)   sizeof(((type *)0)->member)
	Get the size of a structure member without an instance.

Detailed Description

Array and member size helpers.

Macro Definition Documentation

ARRAY_LENGTH

#define ARRAY_LENGTH

(

array

)

(sizeof((array)) / sizeof((array)[0]))

Calculate the length of an array, based on the size of the element type.

Parameters

array

The array to be evaluated.

Returns

The length of the array.

MEMBER_SIZE

#define MEMBER_SIZE	(		type,
			member
	)		sizeof(((type *)0)->member)

Get the size of a structure member without an instance.

Parameters

type	Structure type.
member	Member name.

Returns

Size of the member in bytes.

STATIC_ARRAY_LENGTH

#define STATIC_ARRAY_LENGTH	(		type,
			array
	)		(sizeof((type[])array) / sizeof(type))

Get the number of elements of an array literal, as a compile-time constant.

#define RATES {10, 25, 50}
static const uint16_t s_rates[] = RATES;
_Static_assert(STATIC_ARRAY_LENGTH(uint16_t, RATES) == 3, "");

Parameters

type	Type of the elements.
array	Brace-enclosed array literal.

Returns

Number of elements.