1 | // Boost.Signals library |
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2 | |
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3 | // Copyright Douglas Gregor 2001-2004. Use, modification and |
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4 | // distribution is subject to the Boost Software License, Version |
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5 | // 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
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6 | // http://www.boost.org/LICENSE_1_0.txt) |
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7 | |
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8 | // For more information, see http://www.boost.org |
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9 | |
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10 | #define BOOST_SIGNALS_SOURCE |
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11 | |
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12 | #include <boost/signals/slot.hpp> |
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13 | |
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14 | namespace boost { |
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15 | namespace BOOST_SIGNALS_NAMESPACE { |
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16 | namespace detail { |
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17 | void slot_base::create_connection() |
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18 | { |
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19 | // Create a new connection object |
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20 | basic_connection* con = new basic_connection(); |
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21 | |
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22 | /* nothrow */ { |
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23 | // The signal portion isn't really necessary, except that we need a |
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24 | // signal for the connection to be connected. |
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25 | con->signal = static_cast<void*>(this); |
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26 | con->signal_data = 0; |
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27 | con->blocked_ = false ; |
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28 | con->signal_disconnect = &bound_object_destructed; |
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29 | } |
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30 | |
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31 | // This connection watches for destruction of bound objects. Note |
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32 | // that the reset routine will delete con if an allocation throws |
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33 | data->watch_bound_objects.reset(con); |
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34 | |
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35 | // We create a scoped connection, so that exceptions thrown while |
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36 | // adding bound objects will cause a cleanup of the bound objects |
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37 | // already connected. |
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38 | scoped_connection safe_connection(data->watch_bound_objects); |
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39 | |
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40 | // Now notify each of the bound objects that they are connected to this |
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41 | // slot. |
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42 | for(std::vector<const trackable*>::iterator i = |
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43 | data->bound_objects.begin(); |
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44 | i != data->bound_objects.end(); ++i) { |
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45 | // Notify the object that the slot is connecting to it |
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46 | BOOST_SIGNALS_NAMESPACE::detail::bound_object binding; |
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47 | (*i)->signal_connected(data->watch_bound_objects, binding); |
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48 | |
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49 | // This will notify the bound object that the connection just made |
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50 | // should be disconnected if an exception is thrown before the |
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51 | // end of this iteration |
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52 | BOOST_SIGNALS_NAMESPACE::detail::auto_disconnect_bound_object |
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53 | disconnector(binding); |
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54 | |
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55 | // Add the binding to the list of bindings for the connection |
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56 | con->bound_objects.push_back(binding); |
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57 | |
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58 | // The connection object now knows about the bound object, so if an |
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59 | // exception is thrown later the connection object will notify the |
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60 | // bound object of the disconnection automatically |
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61 | disconnector.release(); |
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62 | } |
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63 | |
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64 | // No exceptions will be thrown past this point. |
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65 | safe_connection.release(); |
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66 | |
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67 | data->watch_bound_objects.set_controlling(true); |
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68 | } |
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69 | } // end namespace detail |
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70 | } // end namespace BOOST_SIGNALS_NAMESPACE |
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71 | } // end namespace boost |
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