| /* |
| * 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 WEBRTC_BASE_ARRAYSIZE_H_ |
| #define WEBRTC_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 // WEBRTC_BASE_ARRAYSIZE_H_ |