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Commit 28a99277 authored by Jooyung Han's avatar Jooyung Han
Browse files

binder: Add enum_range<Enum> 

Native backends of AIDL enum types support a template variable for
enumerating all values of the type.

Bug: 143992652
Test: system/tools/aidl/runtests.sh
      atest CtsNdkBinderTestCases

Change-Id: I3c3d24a6f24c4c02ac5c5b59bb0831c26f695dd2
parent 5d4883d8

libs/binder/include/binder/Enums.h

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/*

 * Copyright (C) 2019 The Android Open Source Project

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *      http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

#pragma once



#include <iterator>

#include <type_traits>



namespace android {



namespace internal {



// Never instantiated. Used as a placeholder for template variables.

template <typename T>

struct invalid_type;



// AIDL generates specializations of this for enums.

template <typename EnumType, typename = std::enable_if_t<std::is_enum<EnumType>::value>>

constexpr invalid_type<EnumType> enum_values;

} // namespace internal



// Usage: for (const auto v : enum_range<EnumType>() ) { ... }

template <typename EnumType, typename = std::enable_if_t<std::is_enum<EnumType>::value>>

struct enum_range {

    constexpr auto begin() const { return std::begin(internal::enum_values<EnumType>); }

    constexpr auto end() const { return std::end(internal::enum_values<EnumType>); }

};



} // namespace android
 
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libs/binder/ndk/include_ndk/android/binder_enums.h

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/*

 * Copyright (C) 2019 The Android Open Source Project

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *      http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */



/**

 * @addtogroup NdkBinder

 * @{

 */



/**

 * @file binder_enums.h

 * @brief Helpers for AIDL enum types.

 */



#pragma once



#include <iterator>

#include <type_traits>



namespace ndk {



namespace internal {

/**

 * Never instantiated. Used as a placeholder for template variables.

 */

template <typename T>

struct invalid_type;



/**

 * AIDL generates specializations of this for enums.

 */

template <typename EnumType, typename = std::enable_if_t<std::is_enum<EnumType>::value>>

constexpr invalid_type<EnumType> enum_values;

}  // namespace internal



/**

 * Iterable interface to enumerate all values of AIDL enum types.

 */

template <typename EnumType, typename = std::enable_if_t<std::is_enum<EnumType>::value>>

struct enum_range {

    /**

     * Return an iterator pointing to the first enum value.

     */

    constexpr auto begin() const { return std::begin(internal::enum_values<EnumType>); }

    /**

     * Return an iterator pointing to one past the last enum value.

     */

    constexpr auto end() const { return std::end(internal::enum_values<EnumType>); }

};



}  // namespace ndk



/** @} */
 
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