From: Michael Froman Date: Tue, 16 Sep 2025 14:12:00 -0500 Subject: Bug 1985396 - (fix-f7bbf59659) fixes for c++20 support Mercurial Revision: https://hg.mozilla.org/mozilla-central/rev/81dbe2990355d4fd285fb42864ddd765f01c99de --- rtc_base/arraysize.h | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) create mode 100644 rtc_base/arraysize.h diff --git a/rtc_base/arraysize.h b/rtc_base/arraysize.h new file mode 100644 index 0000000000..bf8e6d8810 --- /dev/null +++ b/rtc_base/arraysize.h @@ -0,0 +1,32 @@ +/* + * Copyright (c) 2015 The WebRTC project authors. All Rights Reserved. + * + * Use of this source code is governed by a BSD-style license + * that can be found in the LICENSE file in the root of the source + * tree. An additional intellectual property rights grant can be found + * in the file PATENTS. All contributing project authors may + * be found in the AUTHORS file in the root of the source tree. + */ + +#ifndef RTC_BASE_ARRAYSIZE_H_ +#define RTC_BASE_ARRAYSIZE_H_ + +#include + +// This file defines the arraysize() macro and is derived from Chromium's +// base/macros.h. + +// The arraysize(arr) macro returns the # of elements in an array arr. +// The expression is a compile-time constant, and therefore can be +// used in defining new arrays, for example. If you use arraysize on +// a pointer by mistake, you will get a compile-time error. + +// This template function declaration is used in defining arraysize. +// Note that the function doesn't need an implementation, as we only +// use its type. +template +char (&ArraySizeHelper(T (&array)[N]))[N]; + +#define arraysize(array) (sizeof(ArraySizeHelper(array))) + +#endif // RTC_BASE_ARRAYSIZE_H_