1 /* 2 * Copyright (C) 2016 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef ANDROID_HIDL_PASSTHROUGH_SUPPORT_H 18 #define ANDROID_HIDL_PASSTHROUGH_SUPPORT_H 19 20 #include <android/hidl/base/1.0/IBase.h> 21 22 namespace android { 23 namespace hardware { 24 namespace details { 25 26 /* 27 * Wrap the given interface with the lowest BsChild possible. Will return the 28 * argument directly if nullptr or isRemote(). 29 * 30 * Note that 'static_cast<IFoo*>(wrapPassthrough(foo).get()) is guaranteed to work' 31 * assuming that foo is an instance of IFoo. 32 * 33 * TODO(b/33754152): calling this method multiple times should not re-wrap. 34 */ 35 sp<::android::hidl::base::V1_0::IBase> wrapPassthroughInternal( 36 sp<::android::hidl::base::V1_0::IBase> iface); 37 38 /** 39 * Helper method which provides reasonable code to wrapPassthroughInternal 40 * which can be used to call wrapPassthrough. 41 */ 42 template <typename IType, 43 typename = std::enable_if_t<std::is_same<i_tag, typename IType::_hidl_tag>::value>> wrapPassthrough(sp<IType> iface)44sp<IType> wrapPassthrough(sp<IType> iface) { 45 return static_cast<IType*>(wrapPassthroughInternal(iface).get()); 46 } 47 48 } // namespace details 49 } // namespace hardware 50 } // namespace android 51 52 53 #endif // ANDROID_HIDL_PASSTHROUGH_SUPPORT_H 54