1 /* 2 * Copyright (C) 2018 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 #pragma once 18 19 #include <type_traits> 20 21 namespace android::uirenderer { 22 23 template <typename D, typename S> struct copy_const { 24 using type = std::conditional_t<std::is_const<S>::value, std::add_const_t<D>, D>; 25 }; 26 template <typename D, typename S> using copy_const_t = typename copy_const<D, S>::type; 27 28 template <typename D, typename S> struct copy_volatile { 29 using type = std::conditional_t<std::is_volatile<S>::value, std::add_volatile_t<D>, D>; 30 }; 31 template <typename D, typename S> using copy_volatile_t = typename copy_volatile<D, S>::type; 32 33 template <typename D, typename S> struct copy_cv { 34 using type = copy_volatile_t<copy_const_t<D, S>, S>; 35 }; 36 37 template <typename D, typename S> using same_cv = copy_cv<std::remove_cv_t<D>, S>; 38 template <typename D, typename S> using same_cv_t = typename same_cv<D, S>::type; 39 40 } // namespace android::uirenderer 41