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/* sane - Scanner Access Now Easy.
Copyright (C) 2019 Povilas Kanapickas <povilas@radix.lt>
This file is part of the SANE package.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef BACKEND_GENESYS_STATIC_INIT_H
#define BACKEND_GENESYS_STATIC_INIT_H
#include <functional>
#include <memory>
namespace genesys {
void add_function_to_run_at_backend_exit(const std::function<void()>& function);
// calls functions added via add_function_to_run_at_backend_exit() in reverse order of being
// added.
void run_functions_at_backend_exit();
template<class T>
class StaticInit {
public:
StaticInit() = default;
StaticInit(const StaticInit&) = delete;
StaticInit& operator=(const StaticInit&) = delete;
template<class... Args>
void init(Args&& ... args)
{
ptr_ = std::unique_ptr<T>(new T(std::forward<Args>(args)...));
add_function_to_run_at_backend_exit([this](){ deinit(); });
}
void deinit()
{
ptr_.reset();
}
const T* operator->() const { return ptr_.get(); }
T* operator->() { return ptr_.get(); }
const T& operator*() const { return *ptr_.get(); }
T& operator*() { return *ptr_.get(); }
private:
std::unique_ptr<T> ptr_;
};
} // namespace genesys
#endif // BACKEND_GENESYS_STATIC_INIT_H
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