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Diffstat (limited to 'backend/genesys/static_init.h')
-rw-r--r-- | backend/genesys/static_init.h | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/backend/genesys/static_init.h b/backend/genesys/static_init.h new file mode 100644 index 0000000..3ffa62c --- /dev/null +++ b/backend/genesys/static_init.h @@ -0,0 +1,88 @@ +/* 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 |