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/*
* Copyright (C) 2021 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
namespace aidl::android::hardware::biometrics::fingerprint {
// Interface for representing parameterless functions. Unlike std::function<void()>, this can also
// represent move-only lambdas.
class Callable {
public:
virtual void operator()() = 0;
virtual ~Callable() = default;
// Creates a heap-allocated Callable instance from any function object.
template <typename T>
static std::unique_ptr<Callable> from(T func);
private:
template <typename T>
class AnyFuncWrapper;
};
// Private helper class for wrapping any function object into a Callable.
template <typename T>
class Callable::AnyFuncWrapper : public Callable {
public:
explicit AnyFuncWrapper(T func) : mFunc(std::move(func)) {}
void operator()() override { mFunc(); }
private:
T mFunc;
};
template <typename T>
std::unique_ptr<Callable> Callable::from(T func) {
return std::make_unique<AnyFuncWrapper<T>>(std::move(func));
}
} // namespace aidl::android::hardware::biometrics::fingerprint
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