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      1 /*
      2  * hidl interface for wpa_supplicant daemon
      3  * Copyright (c) 2004-2016, Jouni Malinen <j (at) w1.fi>
      4  * Copyright (c) 2004-2016, Roshan Pius <rpius (at) google.com>
      5  *
      6  * This software may be distributed under the terms of the BSD license.
      7  * See README for more details.
      8  */
      9 
     10 #ifndef HIDL_RETURN_UTIL_H_
     11 #define HIDL_RETURN_UTIL_H_
     12 
     13 namespace android {
     14 namespace hardware {
     15 namespace wifi {
     16 namespace offload {
     17 namespace V1_0 {
     18 namespace implementation {
     19 namespace hidl_return_util {
     20 
     21 /**
     22  * These utility functions are used to invoke a method on the provided
     23  * HIDL interface object.
     24  * It then invokes the HIDL continuation callback with the status and
     25  * any returned values.
     26  */
     27 // Use for HIDL methods which return only an instance of OffloadStatus.
     28 template<typename ObjT, typename WorkFuncT, typename... Args>
     29 Return<void> validateAndCall(ObjT* obj, WorkFuncT&& work,
     30                              const std::function<void(const OffloadStatus&)>& hidl_cb,
     31                              Args&&... args) {
     32     hidl_cb((obj->*work)(std::forward<Args>(args)...));
     33     return Void();
     34 }
     35 
     36 // Use for HIDL methods which return instance of OffloadStatus and a single
     37 // return value.
     38 template<typename ObjT, typename WorkFuncT, typename ReturnT, typename... Args>
     39 Return<void> validateAndCall(ObjT* obj, WorkFuncT&& work,
     40                              const std::function<void(const OffloadStatus&, ReturnT)>& hidl_cb,
     41                              Args&&... args) {
     42     const auto& ret_pair = (obj->*work)(std::forward<Args>(args)...);
     43     const OffloadStatus& status = std::get<0>(ret_pair);
     44     const auto& ret_value = std::get<1>(ret_pair);
     45     hidl_cb(status, ret_value);
     46     return Void();
     47 }
     48 
     49 // Use for HIDL methods which return instance of OffloadStatus and 2 return
     50 // values.
     51 template<typename ObjT, typename WorkFuncT, typename ReturnT1, typename ReturnT2, typename... Args>
     52 Return<void>
     53 validateAndCall(ObjT* obj, WorkFuncT&& work,
     54                 const std::function<void(const OffloadStatus&, ReturnT1, ReturnT2)>& hidl_cb,
     55                 Args&&... args) {
     56     const auto& ret_tuple = (obj->*work)(std::forward<Args>(args)...);
     57     const OffloadStatus& status = std::get<0>(ret_tuple);
     58     const auto& ret_value1 = std::get<1>(ret_tuple);
     59     const auto& ret_value2 = std::get<2>(ret_tuple);
     60     hidl_cb(status, ret_value1, ret_value2);
     61     return Void();
     62 }
     63 
     64 }  // namespace hidl_return_util
     65 }  // namespace implementation
     66 }  // namespace V1_0
     67 }  // namespace offload
     68 }  // namespace wifi
     69 }  // namespace hardware
     70 }  // namespace android
     71 #endif  // HIDL_RETURN_UTIL_H_
     72