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43 lines
915 B
C
43 lines
915 B
C
// Copyright (c) Meta Platforms, Inc. and affiliates.
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// SPDX-License-Identifier: GPL-3.0-or-later
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/**
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* @file
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*
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* Helpers for C arrays.
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*/
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#ifndef DRGN_ARRAY_H
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#define DRGN_ARRAY_H
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#include "pp.h"
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#include "util.h"
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/** @cond */
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#define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
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#define array_for_each_impl(var, arr, unique_end) \
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for (typeof((arr)[0]) *var = (arr), \
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*unique_end = var + array_size(arr); \
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var < unique_end; var++)
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/** @endcond */
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/**
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* Return the number of elements in an array.
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*
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* @hideinitializer
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*/
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#define array_size(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
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/**
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* Iterate over every element in an array.
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*
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* The element is declared as `element_type *var` in the scope of the loop.
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*
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* @hideinitializer
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*/
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#define array_for_each(var, arr) \
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array_for_each_impl(var, arr, PP_UNIQUE(end))
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#endif /* DRGN_ARRAY_H */
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