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 #ifdef WEBRTC_ENABLE_OBJC_SYMBOL_EXPORT 15 16 #if defined(WEBRTC_LIBRARY_IMPL) 17 #define RTC_OBJC_EXPORT __attribute__((visibility("default"))) 18 #endif 19 20 #endif // WEBRTC_ENABLE_OBJC_SYMBOL_EXPORT 21 22 #ifndef RTC_OBJC_EXPORT 23 #define RTC_OBJC_EXPORT 24 #endif 25 26 // Internal macros used to correctly concatenate symbols. 27 #define RTC_SYMBOL_CONCAT_HELPER(a, b) a##b 28 #define RTC_SYMBOL_CONCAT(a, b) RTC_SYMBOL_CONCAT_HELPER(a, b) 29 30 // RTC_OBJC_TYPE_PREFIX 31 // 32 // Macro used to prepend a prefix to the API types that are exported with 33 // RTC_OBJC_EXPORT. 34 // 35 // Clients can patch the definition of this macro locally and build 36 // WebRTC.framework with their own prefix in case symbol clashing is a 37 // problem. 38 // 39 // This macro must only be defined here and not on via compiler flag to 40 // ensure it has a unique value. 41 #define RTC_OBJC_TYPE_PREFIX 42 43 // RCT_OBJC_TYPE 44 // 45 // Macro used internally to declare API types. Declaring an API type without 46 // using this macro will not include the declared type in the set of types 47 // that will be affected by the configurable RTC_OBJC_TYPE_PREFIX. 48 #define RTC_OBJC_TYPE(type_name) RTC_SYMBOL_CONCAT(RTC_OBJC_TYPE_PREFIX, type_name) 49 50 #if defined(__cplusplus) 51 #define RTC_EXTERN extern "C" RTC_OBJC_EXPORT 52 #else 53 #define RTC_EXTERN extern RTC_OBJC_EXPORT 54 #endif 55 56 #ifdef __OBJC__ 57 #define RTC_FWD_DECL_OBJC_CLASS(classname) @class classname 58 #else 59 #define RTC_FWD_DECL_OBJC_CLASS(classname) typedef struct objc_object classname 60 #endif 61 62 #endif // SDK_OBJC_BASE_RTCMACROS_H_ 63