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Side by Side Diff: webrtc/rtc_base/arraysize.h

Issue 2877023002: Move webrtc/{base => rtc_base} (Closed)
Patch Set: update presubmit.py and DEPS include rules Created 3 years, 5 months ago
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1 /* 1 /*
2 * Copyright (c) 2015 The WebRTC project authors. All Rights Reserved. 2 * Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
3 * 3 *
4 * Use of this source code is governed by a BSD-style license 4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source 5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found 6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may 7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree. 8 * be found in the AUTHORS file in the root of the source tree.
9 */ 9 */
10 10
11 #ifndef WEBRTC_BASE_ARRAYSIZE_H_ 11 #ifndef WEBRTC_RTC_BASE_ARRAYSIZE_H_
12 #define WEBRTC_BASE_ARRAYSIZE_H_ 12 #define WEBRTC_RTC_BASE_ARRAYSIZE_H_
13 13
14 #include <stddef.h> 14 #include <stddef.h>
15 15
16 // This file defines the arraysize() macro and is derived from Chromium's 16 // This file defines the arraysize() macro and is derived from Chromium's
17 // base/macros.h. 17 // base/macros.h.
18 18
19 // The arraysize(arr) macro returns the # of elements in an array arr. 19 // The arraysize(arr) macro returns the # of elements in an array arr.
20 // The expression is a compile-time constant, and therefore can be 20 // The expression is a compile-time constant, and therefore can be
21 // used in defining new arrays, for example. If you use arraysize on 21 // used in defining new arrays, for example. If you use arraysize on
22 // a pointer by mistake, you will get a compile-time error. 22 // a pointer by mistake, you will get a compile-time error.
23 23
24 // This template function declaration is used in defining arraysize. 24 // This template function declaration is used in defining arraysize.
25 // Note that the function doesn't need an implementation, as we only 25 // Note that the function doesn't need an implementation, as we only
26 // use its type. 26 // use its type.
27 template <typename T, size_t N> char (&ArraySizeHelper(T (&array)[N]))[N]; 27 template <typename T, size_t N> char (&ArraySizeHelper(T (&array)[N]))[N];
28 28
29 #define arraysize(array) (sizeof(ArraySizeHelper(array))) 29 #define arraysize(array) (sizeof(ArraySizeHelper(array)))
30 30
31 #endif // WEBRTC_BASE_ARRAYSIZE_H_ 31 #endif // WEBRTC_RTC_BASE_ARRAYSIZE_H_
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