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Diffstat (limited to 'third_party/libwebrtc/rtc_base/arraysize.h')
-rw-r--r-- | third_party/libwebrtc/rtc_base/arraysize.h | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/third_party/libwebrtc/rtc_base/arraysize.h b/third_party/libwebrtc/rtc_base/arraysize.h new file mode 100644 index 0000000000..bf8e6d8810 --- /dev/null +++ b/third_party/libwebrtc/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 <stddef.h> + +// 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 <typename T, size_t N> +char (&ArraySizeHelper(T (&array)[N]))[N]; + +#define arraysize(array) (sizeof(ArraySizeHelper(array))) + +#endif // RTC_BASE_ARRAYSIZE_H_ |