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initial commit 2019-09-07 14:03:22 +04:00 • committed by vvaltman
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tdutils/td/utils/Context.h Normal file
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/*
This file is part of TON Blockchain Library.
TON Blockchain Library is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
TON Blockchain Library 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with TON Blockchain Library. If not, see <http://www.gnu.org/licenses/>.
Copyright 2017-2019 Telegram Systems LLP
*/
#pragma once
#include "td/utils/port/thread_local.h"
namespace td {
template <class Impl>
class Context {
public:
static Impl *get() {
return context_;
}
class Guard {
public:
explicit Guard(Impl *new_context) {
old_context_ = context_;
context_ = new_context;
}
~Guard() {
context_ = old_context_;
}
Guard(const Guard &) = delete;
Guard &operator=(const Guard &) = delete;
Guard(Guard &&) = delete;
Guard &operator=(Guard &&) = delete;
private:
Impl *old_context_;
};
private:
static TD_THREAD_LOCAL Impl *context_;
};
template <class Impl>
TD_THREAD_LOCAL Impl *Context<Impl>::context_;
} // namespace td