1 /* 2 * Copyright 2016 The WebRTC Project Authors. All rights reserved. 3 * 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 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #ifndef SDK_OBJC_BASE_RTCMACROS_H_ 12 #define SDK_OBJC_BASE_RTCMACROS_H_ 13 14 // Internal macros used to correctly concatenate symbols. 15 #define RTC_SYMBOL_CONCAT_HELPER(a, b) a##b 16 #define RTC_SYMBOL_CONCAT(a, b) RTC_SYMBOL_CONCAT_HELPER(a, b) 17 18 // RTC_OBJC_TYPE_PREFIX 19 // 20 // Macro used to prepend a prefix to the API types that are exported with 21 // RTC_OBJC_EXPORT. 22 // 23 // Clients can patch the definition of this macro locally and build 24 // WebRTC.framework with their own prefix in case symbol clashing is a 25 // problem. 26 // 27 // This macro must only be defined here and not on via compiler flag to 28 // ensure it has a unique value. 29 #define RTC_OBJC_TYPE_PREFIX 30 31 // RCT_OBJC_TYPE 32 // 33 // Macro used internally to declare API types. Declaring an API type without 34 // using this macro will not include the declared type in the set of types 35 // that will be affected by the configurable RTC_OBJC_TYPE_PREFIX. 36 #define RTC_OBJC_TYPE(type_name) RTC_SYMBOL_CONCAT(RTC_OBJC_TYPE_PREFIX, type_name) 37 38 #define RTC_OBJC_EXPORT __attribute__((visibility("default"))) 39 40 #if defined(__cplusplus) 41 #define RTC_EXTERN extern "C" RTC_OBJC_EXPORT 42 #else 43 #define RTC_EXTERN extern RTC_OBJC_EXPORT 44 #endif 45 46 #ifdef __OBJC__ 47 #define RTC_FWD_DECL_OBJC_CLASS(classname) @class classname 48 #else 49 #define RTC_FWD_DECL_OBJC_CLASS(classname) typedef struct objc_object classname 50 #endif 51 52 #endif // SDK_OBJC_BASE_RTCMACROS_H_ 53