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54 lines
1.6 KiB
54 lines
1.6 KiB
/*
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* Copyright (C) 2021 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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namespace aidl::android::hardware::biometrics::fingerprint {
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// Interface for representing parameterless functions. Unlike std::function<void()>, this can also
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// represent move-only lambdas.
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class Callable {
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public:
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virtual void operator()() = 0;
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virtual ~Callable() = default;
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// Creates a heap-allocated Callable instance from any function object.
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template <typename T>
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static std::unique_ptr<Callable> from(T func);
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private:
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template <typename T>
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class AnyFuncWrapper;
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};
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// Private helper class for wrapping any function object into a Callable.
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template <typename T>
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class Callable::AnyFuncWrapper : public Callable {
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public:
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explicit AnyFuncWrapper(T func) : mFunc(std::move(func)) {}
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void operator()() override { mFunc(); }
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private:
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T mFunc;
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};
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template <typename T>
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std::unique_ptr<Callable> Callable::from(T func) {
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return std::make_unique<AnyFuncWrapper<T>>(std::move(func));
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}
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} // namespace aidl::android::hardware::biometrics::fingerprint
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