/
accessor.hpp
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/
accessor.hpp
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/**
* Copyright (c) 2011-2018 libbitcoin developers (see AUTHORS)
*
* This file is part of libbitcoin.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef LIBBITCOIN_DATABASE_ACCESSOR_HPP
#define LIBBITCOIN_DATABASE_ACCESSOR_HPP
#include <cstddef>
#include <cstdint>
#include <bitcoin/bitcoin.hpp>
#include <bitcoin/database/define.hpp>
#include <bitcoin/database/memory/memory.hpp>
namespace libbitcoin {
namespace database {
/// This class provides shared/protected read/write access to a memory buffer.
/// The call caller must know the buffer size as it is unprotected/unmanaged.
class BCD_API accessor
: public memory, noncopyable
{
public:
/// Assign a null upgradeable buffer pointer.
accessor(upgrade_mutex& mutex);
/// Free the buffer pointer lock.
~accessor();
/// Get the buffer pointer.
uint8_t* buffer();
/// Set the buffer pointer and lock for shared access.
void assign(uint8_t* data);
/// Advance the buffer pointer a specified number of bytes.
void increment(size_t value);
private:
upgrade_mutex& mutex_;
uint8_t* data_;
};
} // namespace database
} // namespace libbitcoin
#endif