/usr/include/bitcoin/utility/weak_bind.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.
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* 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_WEAK_BIND_HPP
#define LIBBITCOIN_UTILITY_WEAK_BIND_HPP
#include <functional>
#include <memory>
namespace libbitcoin {
template <typename WeakPtr, typename Handler>
struct weak_wrapper_impl
{
WeakPtr weak_ref;
Handler handler;
template <typename... Args>
void operator()(Args&&... args)
{
auto raii_lock = weak_ref.lock();
if (raii_lock)
handler(std::forward<Args>(args)...);
}
};
template <typename WeakPtr, typename Handler>
weak_wrapper_impl<
WeakPtr,
typename std::decay<Handler>::type
>
weak_wrapper(WeakPtr weak_ref, Handler handler)
{
return {weak_ref, handler};
}
template <typename MemberFunction, typename Class, typename... Args>
auto weak_bind(MemberFunction member_func,
std::shared_ptr<Class> ref, Args&&... args)
-> decltype(
weak_wrapper(
std::weak_ptr<Class>(ref),
std::bind(member_func, ref.get(), std::forward<Args>(args)...)
))
{
std::weak_ptr<Class> weak_ref = ref;
auto handler =
std::bind(member_func, ref.get(), std::forward<Args>(args)...);
return weak_wrapper(weak_ref, handler);
}
} // libbitcoin
#endif
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