kopia lustrzana https://gitlab.com/sane-project/backends
89 wiersze
2.9 KiB
C
89 wiersze
2.9 KiB
C
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/* sane - Scanner Access Now Easy.
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Copyright (C) 2019 Povilas Kanapickas <povilas@radix.lt>
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This file is part of the SANE package.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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MA 02111-1307, USA.
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As a special exception, the authors of SANE give permission for
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additional uses of the libraries contained in this release of SANE.
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The exception is that, if you link a SANE library with other files
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to produce an executable, this does not by itself cause the
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resulting executable to be covered by the GNU General Public
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License. Your use of that executable is in no way restricted on
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account of linking the SANE library code into it.
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This exception does not, however, invalidate any other reasons why
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the executable file might be covered by the GNU General Public
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License.
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If you submit changes to SANE to the maintainers to be included in
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a subsequent release, you agree by submitting the changes that
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those changes may be distributed with this exception intact.
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If you write modifications of your own for SANE, it is your choice
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whether to permit this exception to apply to your modifications.
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If you do not wish that, delete this exception notice.
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*/
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#ifndef BACKEND_GENESYS_STATIC_INIT_H
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#define BACKEND_GENESYS_STATIC_INIT_H
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#include <functional>
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#include <memory>
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namespace genesys {
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void add_function_to_run_at_backend_exit(const std::function<void()>& function);
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// calls functions added via add_function_to_run_at_backend_exit() in reverse order of being
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// added.
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void run_functions_at_backend_exit();
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template<class T>
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class StaticInit {
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public:
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StaticInit() = default;
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StaticInit(const StaticInit&) = delete;
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StaticInit& operator=(const StaticInit&) = delete;
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template<class... Args>
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void init(Args&& ... args)
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{
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ptr_ = std::unique_ptr<T>(new T(std::forward<Args>(args)...));
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add_function_to_run_at_backend_exit([this](){ deinit(); });
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}
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void deinit()
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{
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ptr_.reset();
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}
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const T* operator->() const { return ptr_.get(); }
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T* operator->() { return ptr_.get(); }
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const T& operator*() const { return *ptr_.get(); }
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T& operator*() { return *ptr_.get(); }
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private:
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std::unique_ptr<T> ptr_;
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};
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} // namespace genesys
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#endif // BACKEND_GENESYS_STATIC_INIT_H
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