/* * 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_
