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57 lines
1.5 KiB
C
57 lines
1.5 KiB
C
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/*
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This file is part of TON Blockchain Library.
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TON Blockchain Library is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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TON Blockchain Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with TON Blockchain Library. If not, see <http://www.gnu.org/licenses/>.
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Copyright 2017-2019 Telegram Systems LLP
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*/
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#pragma once
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#include "td/utils/port/thread_local.h"
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namespace td {
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template <class Impl>
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class Context {
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public:
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static Impl *get() {
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return context_;
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}
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class Guard {
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public:
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explicit Guard(Impl *new_context) {
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old_context_ = context_;
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context_ = new_context;
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}
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~Guard() {
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context_ = old_context_;
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}
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Guard(const Guard &) = delete;
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Guard &operator=(const Guard &) = delete;
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Guard(Guard &&) = delete;
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Guard &operator=(Guard &&) = delete;
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private:
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Impl *old_context_;
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};
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private:
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static TD_THREAD_LOCAL Impl *context_;
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};
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template <class Impl>
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TD_THREAD_LOCAL Impl *Context<Impl>::context_;
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} // namespace td
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