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 #ifndef ANDROID_HARDWARE_VIBRATOR_UTILS_H 17 #define ANDROID_HARDWARE_VIBRATOR_UTILS_H 18 19 template <typename T> 20 class Is_Iterable { 21 private: 22 template <typename U> 23 static std::true_type test(typename U::iterator *u); 24 25 template <typename U> 26 static std::false_type test(U *u); 27 28 public: 29 static const bool value = decltype(test<T>(0))::value; 30 }; 31 32 template <typename T, bool B> 33 using Enable_If_Iterable = std::enable_if_t<Is_Iterable<T>::value == B>; 34 35 #endif // ANDROID_HARDWARE_VIBRATOR_UTILS_H 36