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<div class="title">CObservable.h</div> </div>
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<a href="_c_observable_8h.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/* +---------------------------------------------------------------------------+</span>
<a name="l00002"></a>00002 <span class="comment"> | The Mobile Robot Programming Toolkit (MRPT) C++ library |</span>
<a name="l00003"></a>00003 <span class="comment"> | |</span>
<a name="l00004"></a>00004 <span class="comment"> | http://www.mrpt.org/ |</span>
<a name="l00005"></a>00005 <span class="comment"> | |</span>
<a name="l00006"></a>00006 <span class="comment"> | Copyright (C) 2005-2011 University of Malaga |</span>
<a name="l00007"></a>00007 <span class="comment"> | |</span>
<a name="l00008"></a>00008 <span class="comment"> | This software was written by the Machine Perception and Intelligent |</span>
<a name="l00009"></a>00009 <span class="comment"> | Robotics Lab, University of Malaga (Spain). |</span>
<a name="l00010"></a>00010 <span class="comment"> | Contact: Jose-Luis Blanco <jlblanco@ctima.uma.es> |</span>
<a name="l00011"></a>00011 <span class="comment"> | |</span>
<a name="l00012"></a>00012 <span class="comment"> | This file is part of the MRPT project. |</span>
<a name="l00013"></a>00013 <span class="comment"> | |</span>
<a name="l00014"></a>00014 <span class="comment"> | MRPT is free software: you can redistribute it and/or modify |</span>
<a name="l00015"></a>00015 <span class="comment"> | it under the terms of the GNU General Public License as published by |</span>
<a name="l00016"></a>00016 <span class="comment"> | the Free Software Foundation, either version 3 of the License, or |</span>
<a name="l00017"></a>00017 <span class="comment"> | (at your option) any later version. |</span>
<a name="l00018"></a>00018 <span class="comment"> | |</span>
<a name="l00019"></a>00019 <span class="comment"> | MRPT is distributed in the hope that it will be useful, |</span>
<a name="l00020"></a>00020 <span class="comment"> | but WITHOUT ANY WARRANTY; without even the implied warranty of |</span>
<a name="l00021"></a>00021 <span class="comment"> | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |</span>
<a name="l00022"></a>00022 <span class="comment"> | GNU General Public License for more details. |</span>
<a name="l00023"></a>00023 <span class="comment"> | |</span>
<a name="l00024"></a>00024 <span class="comment"> | You should have received a copy of the GNU General Public License |</span>
<a name="l00025"></a>00025 <span class="comment"> | along with MRPT. If not, see <http://www.gnu.org/licenses/>. |</span>
<a name="l00026"></a>00026 <span class="comment"> | |</span>
<a name="l00027"></a>00027 <span class="comment"> +---------------------------------------------------------------------------+ */</span>
<a name="l00028"></a>00028 <span class="preprocessor">#ifndef CObservable_H</span>
<a name="l00029"></a>00029 <span class="preprocessor"></span><span class="preprocessor">#define CObservable_H</span>
<a name="l00030"></a>00030 <span class="preprocessor"></span>
<a name="l00031"></a>00031 <span class="preprocessor">#include <<a class="code" href="utils__defs_8h.html">mrpt/utils/utils_defs.h</a>></span>
<a name="l00032"></a>00032 <span class="preprocessor">#include <<a class="code" href="mrpt_event_8h.html">mrpt/utils/mrptEvent.h</a>></span>
<a name="l00033"></a>00033
<a name="l00034"></a>00034 <span class="keyword">namespace </span>mrpt
<a name="l00035"></a>00035 {
<a name="l00036"></a>00036 <span class="keyword">namespace </span>utils
<a name="l00037"></a>00037 {
<a name="l00038"></a>00038 <span class="keyword">class </span>CObserver;
<a name="l00039"></a>00039 <span class="comment"></span>
<a name="l00040"></a>00040 <span class="comment"> /** Inherit from this class for those objects capable of being observed by a CObserver class.</span>
<a name="l00041"></a>00041 <span class="comment"> *</span>
<a name="l00042"></a>00042 <span class="comment"> * The only thing to do in your child class is to call CObservable::publishEvent() whenever needed and all the</span>
<a name="l00043"></a>00043 <span class="comment"> * observer classes will be notified.</span>
<a name="l00044"></a>00044 <span class="comment"> *</span>
<a name="l00045"></a>00045 <span class="comment"> * \note The pairs CObservable / CObserver automatically notify each other the destruction of any of them, effectively ending the subscription of events.</span>
<a name="l00046"></a>00046 <span class="comment"> *</span>
<a name="l00047"></a>00047 <span class="comment"> * \sa CObserver, mrptEvent</span>
<a name="l00048"></a>00048 <span class="comment"> * \ingroup mrpt_base_grp</span>
<a name="l00049"></a>00049 <span class="comment"> */</span>
<a name="l00050"></a>00050 <span class="keyword">class </span><a class="code" href="base_2include_2mrpt_2base_2link__pragmas_8h.html#a6045fa0129b1a3d6c8bf895470e66574">BASE_IMPEXP</a> CObservable
<a name="l00051"></a>00051 {
<a name="l00052"></a><a class="code" href="classmrpt_1_1utils_1_1_c_observable.html#a22c18bc499a63fbdf75b61e04846c685">00052</a> <span class="keyword">friend</span> <span class="keyword">class </span><a class="code" href="classmrpt_1_1utils_1_1_c_observer.html" title="Inherit from this class to get notified about events from any CObservable object after subscribing to...">CObserver</a>;
<a name="l00053"></a>00053
<a name="l00054"></a>00054 <span class="keyword">public</span>:
<a name="l00055"></a>00055 <a class="code" href="classmrpt_1_1utils_1_1_c_observable.html" title="Inherit from this class for those objects capable of being observed by a CObserver class...">CObservable</a>();
<a name="l00056"></a>00056 <span class="keyword">virtual</span> ~<a class="code" href="classmrpt_1_1utils_1_1_c_observable.html" title="Inherit from this class for those objects capable of being observed by a CObserver class...">CObservable</a>();
<a name="l00057"></a>00057
<a name="l00058"></a>00058 <span class="keyword">private</span>:
<a name="l00059"></a><a class="code" href="classmrpt_1_1utils_1_1_c_observable.html#af284242c78ccac52706d5c67a3e3946f">00059</a> std<a class="code" href="classstd_1_1set.html">::set<CObserver*></a> <a class="code" href="classmrpt_1_1utils_1_1_c_observable.html#af284242c78ccac52706d5c67a3e3946f">m_subscribers</a>;
<a name="l00060"></a>00060 <span class="keywordtype">void</span> internal_observer_begin(<a class="code" href="classmrpt_1_1utils_1_1_c_observer.html" title="Inherit from this class to get notified about events from any CObservable object after subscribing to...">CObserver</a>*);
<a name="l00061"></a>00061 <span class="keywordtype">void</span> internal_observer_end(<a class="code" href="classmrpt_1_1utils_1_1_c_observer.html" title="Inherit from this class to get notified about events from any CObservable object after subscribing to...">CObserver</a>*);
<a name="l00062"></a>00062
<a name="l00063"></a>00063 <span class="keyword">protected</span>:<span class="comment"></span>
<a name="l00064"></a>00064 <span class="comment"> /** Called when you want this object to emit an event to all the observers currently subscribed to this object. */</span>
<a name="l00065"></a>00065 <span class="keywordtype">void</span> publishEvent(<span class="keyword">const</span> <a class="code" href="classmrpt_1_1utils_1_1mrpt_event.html" title="The basic event type for the observer-observable pattern in MRPT.">mrptEvent</a> &e) <span class="keyword">const</span>;
<a name="l00066"></a>00066 <span class="comment"></span>
<a name="l00067"></a>00067 <span class="comment"> /** Can be called by a derived class before preparing an event for publishing with \a publishEvent to determine if there is no one</span>
<a name="l00068"></a>00068 <span class="comment"> * subscribed, so it can save the wasted time preparing an event that will be not read. */</span>
<a name="l00069"></a><a class="code" href="classmrpt_1_1utils_1_1_c_observable.html#a1c1e8c7d0d184ccdaa7d5a0ee5184e1e">00069</a> <span class="keyword">inline</span> <span class="keywordtype">bool</span> <a class="code" href="classmrpt_1_1utils_1_1_c_observable.html#a1c1e8c7d0d184ccdaa7d5a0ee5184e1e" title="Can be called by a derived class before preparing an event for publishing with publishEvent to determ...">hasSubscribers</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> !m_subscribers.empty(); }
<a name="l00070"></a>00070
<a name="l00071"></a>00071 }; <span class="comment">// End of class def.</span>
<a name="l00072"></a>00072
<a name="l00073"></a>00073 } <span class="comment">// End of namespace</span>
<a name="l00074"></a>00074 } <span class="comment">// end of namespace</span>
<a name="l00075"></a>00075 <span class="preprocessor">#endif</span>
</pre></div></div>
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