/usr/include/core/connection.h is in libproperties-cpp-dev 0.0.1+14.04.20140220-0ubuntu1.
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 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 | /*
* Copyright © 2013 Canonical Ltd.
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License version 3,
* as published by the Free Software Foundation.
*
* 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Authored by: Thomas Voß <thomas.voss@canonical.com>
*/
#ifndef COM_UBUNTU_CONNECTION_H_
#define COM_UBUNTU_CONNECTION_H_
#include <functional>
#include <memory>
#include <mutex>
namespace core
{
class ScopedConnection;
/**
* @brief The Connection class models a signal-slot connection.
*/
class Connection
{
public:
typedef std::function<void(const std::function<void()>&)> Dispatcher;
/**
* @brief Checks if this instance corresponds to an active signal-slot connection.
* @return true iff the instance corresponds to an active signal-slot connection.
*/
inline bool is_connected() const
{
if (!d)
return false;
return (d->disconnector ? true : false);
}
/**
* @brief End a signal-slot connection.
*/
inline void disconnect()
{
if (d)
d->disconnect();
}
/**
* @brief Installs a dispatcher for this signal-slot connection.
* @param dispatcher The dispatcher to be used for signal emissions.
*/
inline void dispatch_via(const Dispatcher& dispatcher)
{
if (d && d->dispatcher_installer)
d->dispatcher_installer(dispatcher);
}
private:
friend class ScopedConnection;
typedef std::function<void()> Disconnector;
typedef std::function<void(const Dispatcher&)> DispatcherInstaller;
template<typename ... Arguments> friend class Signal;
inline Connection(const Disconnector& disconnector,
const DispatcherInstaller& installer)
: d(std::make_shared<Private>(disconnector, installer))
{
}
inline bool operator<(const Connection& rhs) const
{
return d < rhs.d;
}
inline void reset()
{
if (d)
d->reset();
}
struct Private
{
Private(const Connection::Disconnector& disconnector,
const Connection::DispatcherInstaller& dispatcher_installer)
: disconnector(disconnector),
dispatcher_installer(dispatcher_installer)
{
}
inline void reset()
{
std::lock_guard<std::mutex> lg(guard);
reset_locked();
}
inline void reset_locked()
{
static const Connection::Disconnector empty_disconnector{};
static const Connection::DispatcherInstaller empty_dispatcher_installer{};
disconnector = empty_disconnector;
dispatcher_installer = empty_dispatcher_installer;
}
inline void disconnect()
{
static const Connection::Disconnector empty_disconnector{};
std::lock_guard<std::mutex> lg(guard);
if (disconnector)
disconnector();
reset_locked();
}
std::mutex guard;
Connection::Disconnector disconnector;
Connection::DispatcherInstaller dispatcher_installer;
};
// The whole class is implicitly shared and we thus forward our complete
// shared state to a private structure that is lifetime-managed by a shared_ptr.
std::shared_ptr<Private> d;
};
/**
* @brief Scoped helper class to map signal-slot connection mgmt. to RAII.
*/
class ScopedConnection
{
public:
/**
* @brief Constructs an instance for an existing signal-slot connection.
* @param c The existing signal-slot connection.
*/
inline ScopedConnection(const Connection& c) : connection(c)
{
}
inline ScopedConnection(ScopedConnection&& rhs) : connection(std::move(rhs.connection))
{
}
ScopedConnection(const ScopedConnection&) = delete;
/**
* @brief Disconnects the signal-slot connection.
*/
inline ~ScopedConnection() noexcept(true)
{
try
{
connection.disconnect();
} catch(...)
{
}
}
inline ScopedConnection& operator=(ScopedConnection&& rhs)
{
connection = std::move(rhs.connection);
return *this;
}
ScopedConnection& operator=(const ScopedConnection&) = delete;
bool operator==(const ScopedConnection&) = delete;
inline bool operator<(const ScopedConnection& rhs) const
{
return connection < rhs.connection;
}
private:
Connection connection;
};
}
#endif // COM_UBUNTU_CONNECTION_H_
|