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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, write to the Free Software
+ Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ MA 02111-1307, USA.
+
+ As a special exception, the authors of SANE give permission for
+ additional uses of the libraries contained in this release of SANE.
+
+ The exception is that, if you link a SANE library with other files
+ to produce an executable, this does not by itself cause the
+ resulting executable to be covered by the GNU General Public
+ License. Your use of that executable is in no way restricted on
+ account of linking the SANE library code into it.
+
+ This exception does not, however, invalidate any other reasons why
+ the executable file might be covered by the GNU General Public
+ License.
+
+ If you submit changes to SANE to the maintainers to be included in
+ a subsequent release, you agree by submitting the changes that
+ those changes may be distributed with this exception intact.
+
+ If you write modifications of your own for SANE, it is your choice
+ whether to permit this exception to apply to your modifications.
+ If you do not wish that, delete this exception notice.
+*/
+
+#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