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      1 /*
      2  * Copyright (C) 2019 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 #if defined(__cplusplus)
     18 #define __BEGIN_DECLS extern "C" {
     19 #define __END_DECLS }
     20 #else
     21 #define __BEGIN_DECLS
     22 #define __END_DECLS
     23 #endif
     24 
     25 #ifndef __UNUSED
     26 #define __UNUSED __attribute__((__unused__))
     27 #endif  // __UNUSED
     28