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<div class="title">events.cpp</div> </div>
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<p>A simple demonstration of using the event system</p>
<div class="fragment"><div class="line"><span class="preprocessor">#include <<a class="code" href="event__handler_8hpp.html">libfilezilla/event_handler.hpp</a>></span></div><div class="line"></div><div class="line"><span class="preprocessor">#include <iostream></span></div><div class="line"><span class="preprocessor">#include <string></span></div><div class="line"><span class="preprocessor">#include <vector></span></div><div class="line"></div><div class="line"><span class="comment">// A condition that we'll use in this example to signal the main</span></div><div class="line"><span class="comment">// thread that the worker has processed the event.</span></div><div class="line"><a name="_a0"></a><a class="code" href="classfz_1_1condition.html">fz::condition</a> c;</div><div class="line"><a name="_a1"></a><a class="code" href="classfz_1_1mutex.html">fz::mutex</a> m;</div><div class="line"></div><div class="line"></div><div class="line"><span class="comment">// Define a new event.</span></div><div class="line"><span class="comment">// The event is uniquely identified via the incomplete my_event_type struct and</span></div><div class="line"><span class="comment">// has two arguments: A string and a vector of ints.</span></div><div class="line"><span class="keyword">struct </span>my_event_type;</div><div class="line"><span class="keyword">typedef</span> <a name="_a2"></a><a class="code" href="classfz_1_1simple__event.html">fz::simple_event<my_event_type, std::string, std::vector<int></a>> my_event;</div><div class="line"></div><div class="line"><span class="comment">// A simple event handler</span></div><div class="line"><span class="keyword">class </span>handler final : <span class="keyword">public</span> <a name="_a3"></a><a class="code" href="classfz_1_1event__handler.html">fz::event_handler</a></div><div class="line">{</div><div class="line"><span class="keyword">public</span>:</div><div class="line"> handler(<a name="_a4"></a><a class="code" href="classfz_1_1event__loop.html">fz::event_loop</a>& l)</div><div class="line"> : <a class="code" href="namespacefz.html">fz</a>::event_handler(l)</div><div class="line"> {}</div><div class="line"></div><div class="line"> <span class="keyword">virtual</span> ~handler()</div><div class="line"> {</div><div class="line"> <span class="comment">// This _MUST_ be called to avoid a race so that operator()(fz::event_base const&) is not called on a partially destructed object.</span></div><div class="line"> <a name="a5"></a><a class="code" href="classfz_1_1event__handler.html#a50653cb04de110c658a44cf9eccfa391">remove_handler</a>();</div><div class="line"> }</div><div class="line"></div><div class="line"><span class="keyword">private</span>:</div><div class="line"> <span class="comment">// The event loop calls this function for every event sent to this handler.</span></div><div class="line"> <span class="keyword">virtual</span> <span class="keywordtype">void</span> <a name="a6"></a><a class="code" href="classfz_1_1event__handler.html#a98f41a1071a9ef5318929178dec7c45c">operator()</a>(<a name="_a7"></a><a class="code" href="classfz_1_1event__base.html">fz::event_base</a> <span class="keyword">const</span>& ev)</div><div class="line"> {</div><div class="line"> <span class="comment">// Dispatch the event to the correct function.</span></div><div class="line"> fz::dispatch<my_event>(ev, <span class="keyword">this</span>, &handler::on_my_event);</div><div class="line"> }</div><div class="line"></div><div class="line"> <span class="keywordtype">void</span> on_my_event(std::string <span class="keyword">const</span>& s, std::vector<int> <span class="keyword">const</span>& v)</div><div class="line"> {</div><div class="line"> std::cout << <span class="stringliteral">"Received event with text \""</span> << s << <span class="stringliteral">"\" and a vector with "</span> << v.size() << <span class="stringliteral">" elements"</span> << std::endl;</div><div class="line"></div><div class="line"> <span class="comment">// Signal the condition</span></div><div class="line"> <a name="_a8"></a><a class="code" href="classfz_1_1scoped__lock.html">fz::scoped_lock</a> lock(m);</div><div class="line"> c.<a name="a9"></a><a class="code" href="classfz_1_1condition.html#a93f86ef1fc563f47689777cb987b3b2b">signal</a>(lock);</div><div class="line"> }</div><div class="line">};</div><div class="line"></div><div class="line"><span class="keywordtype">int</span> main()</div><div class="line">{</div><div class="line"> <span class="comment">// Start an event loop</span></div><div class="line"> <a class="code" href="classfz_1_1event__loop.html">fz::event_loop</a> l;</div><div class="line"></div><div class="line"> <span class="comment">// Create a handler</span></div><div class="line"> handler h(l);</div><div class="line"></div><div class="line"> <span class="comment">// Send an event to the handler</span></div><div class="line"> h.send_event<my_event>(<span class="stringliteral">"Hello World!"</span>, std::vector<int>{23, 42, 666});</div><div class="line"></div><div class="line"> <span class="comment">// Wait until a signal from the worker thread</span></div><div class="line"> <a class="code" href="classfz_1_1scoped__lock.html">fz::scoped_lock</a> lock(m);</div><div class="line"> c.<a name="a10"></a><a class="code" href="classfz_1_1condition.html#a1d557df085bb788b92afe06ad00423c7">wait</a>(lock);</div><div class="line"></div><div class="line"> <span class="comment">// All done.</span></div><div class="line"> <span class="keywordflow">return</span> 0;</div><div class="line">}</div></div><!-- fragment --> </div><!-- contents -->
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