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/*
* Copyright (C) 2020 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.
*/
#ifndef CHRE_UTIL_ALWAYS_FALSE_H_
#define CHRE_UTIL_ALWAYS_FALSE_H_
#include <type_traits>
namespace chre {
/**
* Simple helper which can be used when a type-dependent expression is needed
* that evaluates to false. Useful with static_assert in templates, for example:
*
* <code>
* template<typename T>
* class MyClass {
* static_assert(AlwaysFalse<T>::value,
* "Use one of the supported template specializations");
* };
*
* template<>
* class MyClass<int> {
* // (valid implementation)
* };
* </code>
*/
template <typename... T>
struct AlwaysFalse : std::false_type {};
} // namespace chre
#endif // CHRE_UTIL_ALWAYS_FALSE_H_
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