/usr/include/bitcoin/utility/subscriber.hpp is in libbitcoin-dev 2.0-2.2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 | /*
* Copyright (c) 2011-2013 libbitcoin developers (see AUTHORS)
*
* This file is part of libbitcoin.
*
* libbitcoin is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License with
* additional permissions to the one published by the Free Software
* Foundation, either version 3 of the License, or (at your option)
* any later version. For more information see LICENSE.
*
* 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_UTILITY_SUBSCRIBER_HPP
#define LIBBITCOIN_UTILITY_SUBSCRIBER_HPP
#include <stack>
#include <bitcoin/types.hpp>
#include <bitcoin/threadpool.hpp>
#include <bitcoin/utility/assert.hpp>
namespace libbitcoin {
template <typename... Args>
class subscriber
: public std::enable_shared_from_this<subscriber<Args...>>
{
public:
typedef std::function<void (Args...)> handler_type;
typedef std::shared_ptr<subscriber<Args...>> ptr;
subscriber(threadpool& pool)
: strand_(pool.service())
{
}
void subscribe(handler_type handle)
{
strand_.dispatch(
std::bind(&subscriber<Args...>::do_subscribe,
this->shared_from_this(), handle));
}
void relay(Args... params)
{
strand_.dispatch(
std::bind(&subscriber<Args...>::do_relay,
this->shared_from_this(), std::forward<Args>(params)...));
}
private:
typedef std::stack<handler_type> registry_stack;
void do_subscribe(handler_type handle)
{
registry_.push(handle);
}
void do_relay(Args... params)
{
registry_stack notify_copy = registry_;
registry_ = registry_stack();
while (!notify_copy.empty())
{
notify_copy.top()(params...);
notify_copy.pop();
}
BITCOIN_ASSERT(notify_copy.empty());
}
io_service::strand strand_;
registry_stack registry_;
};
template <typename... Args>
using subscriber_ptr = std::shared_ptr<subscriber<Args...>>;
} // namespace libbitcoin
#endif
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