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 <span id="projectnumber">1.15.0</span>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> </div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> </div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <!--</div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> @cond TURN_OFF_DOXYGEN</div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> --></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> [](https://travis-ci.org/skypjack/uvw)</div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> [](https://ci.appveyor.com/project/skypjack/uvw)</div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> [](https://coveralls.io/github/skypjack/uvw?branch=master)</div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> [](https://bintray.com/skypjack/conan/uvw%3Askypjack/_latestVersion)</div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> [](https://gitter.im/skypjack/uvw)</div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> [](https://www.paypal.me/skypjack)</div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> </div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> Do you have a **question** that doesn't require you to open an issue? Join the</div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> [gitter channel](https://gitter.im/skypjack/uvw).<br/></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> If you use `uvw` and you want to **say thanks** or **support** the project,</div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> please **consider becoming a patron**:</div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> </div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> [](https://www.patreon.com/bePatron?c=1772573)</div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span> </div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <!--</div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span> @endcond TURN_OFF_DOXYGEN</div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span> --></div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span> </div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span> # Introduction</div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span> </div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span> `uvw` is a header-only, event based, tiny and easy to use *libuv* wrapper in</div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span> modern C++.<br/></div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span> The basic idea is to hide completely the *C-ish* interface of *libuv* behind a</div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span> graceful C++ API. Currently, no `uv_*_t` data structure is actually exposed by</div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span> the library.<br/></div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span> Note that `uvw` stays true to the API of *libuv* and it doesn't add anything to</div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span> its interface. For the same reasons, users of the library must follow the same</div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span> rules who are used to follow with *libuv*.<br/></div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span> As an example, a *handle* should be initialized before any other operation and</div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span> closed once it is no longer in use.</div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span> </div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span> ## Code Example</div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span> </div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span> ```cpp</div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span> #include <uvw.hpp></div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span> #include <memory></div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span> </div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span> void listen(uvw::Loop &loop) {</div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  std::shared_ptr<uvw::TCPHandle> tcp = loop.resource<uvw::TCPHandle>();</div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span> </div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  tcp->once<uvw::ListenEvent>([](const uvw::ListenEvent &, uvw::TCPHandle &srv) {</div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  std::shared_ptr<uvw::TCPHandle> client = srv.loop().resource<uvw::TCPHandle>();</div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span> </div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  client->on<uvw::CloseEvent>([ptr = srv.shared_from_this()](const uvw::CloseEvent &, uvw::TCPHandle &) { ptr->close(); });</div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  client->on<uvw::EndEvent>([](const uvw::EndEvent &, uvw::TCPHandle &client) { client.close(); });</div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span> </div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  srv.accept(*client);</div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  client->read();</div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  });</div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span> </div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  tcp->bind("127.0.0.1", 4242);</div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  tcp->listen();</div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span> }</div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span> </div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span> void conn(uvw::Loop &loop) {</div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  auto tcp = loop.resource<uvw::TCPHandle>();</div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span> </div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  tcp->on<uvw::ErrorEvent>([](const uvw::ErrorEvent &, uvw::TCPHandle &) { /* handle errors */ });</div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span> </div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  tcp->once<uvw::ConnectEvent>([](const uvw::ConnectEvent &, uvw::TCPHandle &tcp) {</div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  auto dataWrite = std::unique_ptr<char[]>(new char[2]{ 'b', 'c' });</div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  tcp.write(std::move(dataWrite), 2);</div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  tcp.close();</div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  });</div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span> </div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  tcp->connect(std::string{"127.0.0.1"}, 4242);</div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span> }</div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span> </div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span> int main() {</div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  auto loop = uvw::Loop::getDefault();</div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  listen(*loop);</div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  conn(*loop);</div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  loop->run();</div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span> }</div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span> ```</div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span> </div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span> ## Motivation</div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span> </div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span> The main reason for which `uvw` has been written is the fact that it does not</div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span> exist a valid *libuv* wrapper in C++. That's all.</div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span> </div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span> # Build Instructions</div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span> </div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span> ## Requirements</div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span> </div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span> To be able to use `uvw`, users must provide the following system-wide tools:</div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span> </div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span> * A full-featured compiler that supports at least C++14.</div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span> * `libuv` (which version depends on the tag of `uvw` in use).</div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span> </div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span> The requirements below are mandatory to compile the tests and to extract the</div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span> documentation:</div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span> </div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span> * CMake version 3.2 or later.</div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span> * Doxygen version 1.8 or later.</div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span> </div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span> Note that `libuv` is part of the dependencies of the project and it will be</div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span> cloned by `cmake` (see below for further details).<br/></div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span> Because of that, users have not to install it to compile and execute the tests.</div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span> </div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span> ## Library</div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span> </div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span> `uvw` is a header-only library.<br/></div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span> This means that including the `uvw.hpp` header or one of the other `uvw/*.hpp`</div><div class="line"><a name="l00110"></a><span class="lineno"> 110</span> headers is enough to use it.<br/></div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span> It's a matter of adding the following line at the top of a file:</div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span> </div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span> ```cpp</div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span> #include <uvw.hpp></div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span> ```</div><div class="line"><a name="l00116"></a><span class="lineno"> 116</span> </div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span> Then pass the proper `-I` argument to the compiler to add the `src` directory to</div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span> the include paths.<br/></div><div class="line"><a name="l00119"></a><span class="lineno"> 119</span> Note that users are demanded to correctly setup include directories and</div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span> libraries search paths for *libuv*.</div><div class="line"><a name="l00121"></a><span class="lineno"> 121</span> </div><div class="line"><a name="l00122"></a><span class="lineno"> 122</span> ## Versioning</div><div class="line"><a name="l00123"></a><span class="lineno"> 123</span> </div><div class="line"><a name="l00124"></a><span class="lineno"> 124</span> Starting with tag _v1.12.0_ of `libuv`, `uvw` follows the</div><div class="line"><a name="l00125"></a><span class="lineno"> 125</span> [semantic versioning](http://semver.org/) scheme.<br/></div><div class="line"><a name="l00126"></a><span class="lineno"> 126</span> The problem is that any version of `uvw` also requires to track explicitly the</div><div class="line"><a name="l00127"></a><span class="lineno"> 127</span> version of `libuv` to which it is bound.<br/></div><div class="line"><a name="l00128"></a><span class="lineno"> 128</span> Because of that, the latter wil be appended to the version of `uvw`. As an</div><div class="line"><a name="l00129"></a><span class="lineno"> 129</span> example:</div><div class="line"><a name="l00130"></a><span class="lineno"> 130</span> </div><div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  vU.V.W_libuv-vX.Y</div><div class="line"><a name="l00132"></a><span class="lineno"> 132</span> </div><div class="line"><a name="l00133"></a><span class="lineno"> 133</span> In particular, the following applies:</div><div class="line"><a name="l00134"></a><span class="lineno"> 134</span> </div><div class="line"><a name="l00135"></a><span class="lineno"> 135</span> * _U.V.W_ are major, minor and patch versions of `uvw`.</div><div class="line"><a name="l00136"></a><span class="lineno"> 136</span> * _X.Y_ is the version of `libuv` to which to refer (where any patch version is</div><div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  valid).</div><div class="line"><a name="l00138"></a><span class="lineno"> 138</span> </div><div class="line"><a name="l00139"></a><span class="lineno"> 139</span> In other terms, tags will look like this from now on:</div><div class="line"><a name="l00140"></a><span class="lineno"> 140</span> </div><div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  v1.0.0_libuv-v1.12</div><div class="line"><a name="l00142"></a><span class="lineno"> 142</span> </div><div class="line"><a name="l00143"></a><span class="lineno"> 143</span> Branch `master` of `uvw` will be a work in progress branch that follows branch</div><div class="line"><a name="l00144"></a><span class="lineno"> 144</span> _v1.x_ of `libuv` (at least as long as it remains their _master_ branch).<br/></div><div class="line"><a name="l00145"></a><span class="lineno"> 145</span> </div><div class="line"><a name="l00146"></a><span class="lineno"> 146</span> ## Documentation</div><div class="line"><a name="l00147"></a><span class="lineno"> 147</span> </div><div class="line"><a name="l00148"></a><span class="lineno"> 148</span> The documentation is based on</div><div class="line"><a name="l00149"></a><span class="lineno"> 149</span> [`doxygen`](http://www.stack.nl/~dimitri/doxygen/). To build it:</div><div class="line"><a name="l00150"></a><span class="lineno"> 150</span> </div><div class="line"><a name="l00151"></a><span class="lineno"> 151</span> * `$ cd build`</div><div class="line"><a name="l00152"></a><span class="lineno"> 152</span> * `$ cmake ..`</div><div class="line"><a name="l00153"></a><span class="lineno"> 153</span> * `$ make docs`</div><div class="line"><a name="l00154"></a><span class="lineno"> 154</span> </div><div class="line"><a name="l00155"></a><span class="lineno"> 155</span> The API reference will be created in HTML format within the directory</div><div class="line"><a name="l00156"></a><span class="lineno"> 156</span> `build/docs/html`.<br/></div><div class="line"><a name="l00157"></a><span class="lineno"> 157</span> To navigate it with your favorite browser:</div><div class="line"><a name="l00158"></a><span class="lineno"> 158</span> </div><div class="line"><a name="l00159"></a><span class="lineno"> 159</span> * `$ cd build`</div><div class="line"><a name="l00160"></a><span class="lineno"> 160</span> * `$ your_favorite_browser docs/html/index.html`</div><div class="line"><a name="l00161"></a><span class="lineno"> 161</span> </div><div class="line"><a name="l00162"></a><span class="lineno"> 162</span> The API reference is also available [online](https://skypjack.github.io/uvw/)</div><div class="line"><a name="l00163"></a><span class="lineno"> 163</span> for the latest version.</div><div class="line"><a name="l00164"></a><span class="lineno"> 164</span> </div><div class="line"><a name="l00165"></a><span class="lineno"> 165</span> ### Note</div><div class="line"><a name="l00166"></a><span class="lineno"> 166</span> </div><div class="line"><a name="l00167"></a><span class="lineno"> 167</span> The documentation is mostly inspired by the official</div><div class="line"><a name="l00168"></a><span class="lineno"> 168</span> [libuv API documentation](http://docs.libuv.org/en/v1.x/) for obvious</div><div class="line"><a name="l00169"></a><span class="lineno"> 169</span> reasons.<br/></div><div class="line"><a name="l00170"></a><span class="lineno"> 170</span> If you are mainly interested in the way `uvw` imports `libuv` in a `cmake` based</div><div class="line"><a name="l00171"></a><span class="lineno"> 171</span> project, I suggest you to take a look at</div><div class="line"><a name="l00172"></a><span class="lineno"> 172</span> [this](https://github.com/skypjack/libuv_cmake) repository instead.</div><div class="line"><a name="l00173"></a><span class="lineno"> 173</span> </div><div class="line"><a name="l00174"></a><span class="lineno"> 174</span> ## Tests</div><div class="line"><a name="l00175"></a><span class="lineno"> 175</span> </div><div class="line"><a name="l00176"></a><span class="lineno"> 176</span> To compile and run the tests, `uvw` requires *libuv* and *googletest*.<br/></div><div class="line"><a name="l00177"></a><span class="lineno"> 177</span> `cmake` will download and compile both the libraries before to compile anything</div><div class="line"><a name="l00178"></a><span class="lineno"> 178</span> else.</div><div class="line"><a name="l00179"></a><span class="lineno"> 179</span> </div><div class="line"><a name="l00180"></a><span class="lineno"> 180</span> To build the tests:</div><div class="line"><a name="l00181"></a><span class="lineno"> 181</span> </div><div class="line"><a name="l00182"></a><span class="lineno"> 182</span> * `$ cd build`</div><div class="line"><a name="l00183"></a><span class="lineno"> 183</span> * `$ cmake .. -DBUILD_TESTING=ON`</div><div class="line"><a name="l00184"></a><span class="lineno"> 184</span> * `$ make`</div><div class="line"><a name="l00185"></a><span class="lineno"> 185</span> * `$ ctest -j4 -R uvw`</div><div class="line"><a name="l00186"></a><span class="lineno"> 186</span> </div><div class="line"><a name="l00187"></a><span class="lineno"> 187</span> Omit `-R uvw` if you also want to test `libuv` and other dependencies.</div><div class="line"><a name="l00188"></a><span class="lineno"> 188</span> </div><div class="line"><a name="l00189"></a><span class="lineno"> 189</span> # Crash Course</div><div class="line"><a name="l00190"></a><span class="lineno"> 190</span> </div><div class="line"><a name="l00191"></a><span class="lineno"> 191</span> ## Vademecum</div><div class="line"><a name="l00192"></a><span class="lineno"> 192</span> </div><div class="line"><a name="l00193"></a><span class="lineno"> 193</span> There is only one rule when using `uvw`: always initialize the resources and</div><div class="line"><a name="l00194"></a><span class="lineno"> 194</span> terminate them.</div><div class="line"><a name="l00195"></a><span class="lineno"> 195</span> </div><div class="line"><a name="l00196"></a><span class="lineno"> 196</span> Resources belong mainly to two families: _handles_ and _requests_.<br/></div><div class="line"><a name="l00197"></a><span class="lineno"> 197</span> Handles represent long-lived objects capable of performing certain operations</div><div class="line"><a name="l00198"></a><span class="lineno"> 198</span> while active.<br/></div><div class="line"><a name="l00199"></a><span class="lineno"> 199</span> Requests represent (typically) short-lived operations performed either over a</div><div class="line"><a name="l00200"></a><span class="lineno"> 200</span> handle or standalone.</div><div class="line"><a name="l00201"></a><span class="lineno"> 201</span> </div><div class="line"><a name="l00202"></a><span class="lineno"> 202</span> The following sections will explain in short what it means to initialize and</div><div class="line"><a name="l00203"></a><span class="lineno"> 203</span> terminate these kinds of resources.<br/></div><div class="line"><a name="l00204"></a><span class="lineno"> 204</span> For more details, please refer to the</div><div class="line"><a name="l00205"></a><span class="lineno"> 205</span> [online documentation](https://skypjack.github.io/uvw/).</div><div class="line"><a name="l00206"></a><span class="lineno"> 206</span> </div><div class="line"><a name="l00207"></a><span class="lineno"> 207</span> ## Handles</div><div class="line"><a name="l00208"></a><span class="lineno"> 208</span> </div><div class="line"><a name="l00209"></a><span class="lineno"> 209</span> Initialization is usually performed under the hood and can be even passed over,</div><div class="line"><a name="l00210"></a><span class="lineno"> 210</span> as far as handles are created using the `Loop::resource` member function.<br/></div><div class="line"><a name="l00211"></a><span class="lineno"> 211</span> On the other side, handles keep themselves alive until one explicitly closes</div><div class="line"><a name="l00212"></a><span class="lineno"> 212</span> them. Because of that, memory usage will grow up if users simply forget about a</div><div class="line"><a name="l00213"></a><span class="lineno"> 213</span> handle.<br/></div><div class="line"><a name="l00214"></a><span class="lineno"> 214</span> Therefore the rule quickly becomes *always close your handles*. It's as simple</div><div class="line"><a name="l00215"></a><span class="lineno"> 215</span> as calling the `close` member function on them.</div><div class="line"><a name="l00216"></a><span class="lineno"> 216</span> </div><div class="line"><a name="l00217"></a><span class="lineno"> 217</span> ## Requests</div><div class="line"><a name="l00218"></a><span class="lineno"> 218</span> </div><div class="line"><a name="l00219"></a><span class="lineno"> 219</span> Usually initializing a request object is not required. Anyway, the recommended</div><div class="line"><a name="l00220"></a><span class="lineno"> 220</span> way to create a request is still through the `Loop::resource` member</div><div class="line"><a name="l00221"></a><span class="lineno"> 221</span> function.<br/></div><div class="line"><a name="l00222"></a><span class="lineno"> 222</span> Requests will keep themselves alive as long as they are bound to unfinished</div><div class="line"><a name="l00223"></a><span class="lineno"> 223</span> underlying activities. This means that users have not to discard explicitly a</div><div class="line"><a name="l00224"></a><span class="lineno"> 224</span> request.<br/></div><div class="line"><a name="l00225"></a><span class="lineno"> 225</span> Therefore the rule quickly becomes *feel free to make a request and forget about</div><div class="line"><a name="l00226"></a><span class="lineno"> 226</span> it*. It's as simple as calling a member function on them.</div><div class="line"><a name="l00227"></a><span class="lineno"> 227</span> </div><div class="line"><a name="l00228"></a><span class="lineno"> 228</span> ## The Loop and the Resource</div><div class="line"><a name="l00229"></a><span class="lineno"> 229</span> </div><div class="line"><a name="l00230"></a><span class="lineno"> 230</span> The first thing to do to use `uvw` is to create a loop. In case the default one</div><div class="line"><a name="l00231"></a><span class="lineno"> 231</span> is enough, it's easy as doing this:</div><div class="line"><a name="l00232"></a><span class="lineno"> 232</span> </div><div class="line"><a name="l00233"></a><span class="lineno"> 233</span> ```cpp</div><div class="line"><a name="l00234"></a><span class="lineno"> 234</span> auto loop = uvw::Loop::getDefault();</div><div class="line"><a name="l00235"></a><span class="lineno"> 235</span> ```</div><div class="line"><a name="l00236"></a><span class="lineno"> 236</span> </div><div class="line"><a name="l00237"></a><span class="lineno"> 237</span> Note that loop objects don't require to be closed explicitly, even if they offer</div><div class="line"><a name="l00238"></a><span class="lineno"> 238</span> the `close` member function in case an user wants to do that.<br/></div><div class="line"><a name="l00239"></a><span class="lineno"> 239</span> Loops can be started using the `run` member function. The two calls below are</div><div class="line"><a name="l00240"></a><span class="lineno"> 240</span> equivalent:</div><div class="line"><a name="l00241"></a><span class="lineno"> 241</span> </div><div class="line"><a name="l00242"></a><span class="lineno"> 242</span> ```cpp</div><div class="line"><a name="l00243"></a><span class="lineno"> 243</span> loop->run();</div><div class="line"><a name="l00244"></a><span class="lineno"> 244</span> loop->run<uvw::Loop::Mode::DEFAULT>();</div><div class="line"><a name="l00245"></a><span class="lineno"> 245</span> ```</div><div class="line"><a name="l00246"></a><span class="lineno"> 246</span> </div><div class="line"><a name="l00247"></a><span class="lineno"> 247</span> Available modes are: `DEFAULT`, `ONCE`, `NOWAIT`. Please refer to the</div><div class="line"><a name="l00248"></a><span class="lineno"> 248</span> documentation of *libuv* for further details.</div><div class="line"><a name="l00249"></a><span class="lineno"> 249</span> </div><div class="line"><a name="l00250"></a><span class="lineno"> 250</span> In order to create a resource and to bind it to the given loop, just do the</div><div class="line"><a name="l00251"></a><span class="lineno"> 251</span> following:</div><div class="line"><a name="l00252"></a><span class="lineno"> 252</span> </div><div class="line"><a name="l00253"></a><span class="lineno"> 253</span> ```cpp</div><div class="line"><a name="l00254"></a><span class="lineno"> 254</span> auto tcp = loop.resource<uvw::TCPHandle>();</div><div class="line"><a name="l00255"></a><span class="lineno"> 255</span> ```</div><div class="line"><a name="l00256"></a><span class="lineno"> 256</span> </div><div class="line"><a name="l00257"></a><span class="lineno"> 257</span> The line above will create and initialize a tcp handle, then a shared pointer to</div><div class="line"><a name="l00258"></a><span class="lineno"> 258</span> that resource will be returned.<br/></div><div class="line"><a name="l00259"></a><span class="lineno"> 259</span> Users should check if pointers have been correctly initialized: in case of</div><div class="line"><a name="l00260"></a><span class="lineno"> 260</span> errors, they won't be.<br/></div><div class="line"><a name="l00261"></a><span class="lineno"> 261</span> Another way to create a resource is:</div><div class="line"><a name="l00262"></a><span class="lineno"> 262</span> </div><div class="line"><a name="l00263"></a><span class="lineno"> 263</span> ```cpp</div><div class="line"><a name="l00264"></a><span class="lineno"> 264</span> auto tcp = TCPHandle::create(loop);</div><div class="line"><a name="l00265"></a><span class="lineno"> 265</span> tcp->init();</div><div class="line"><a name="l00266"></a><span class="lineno"> 266</span> ```</div><div class="line"><a name="l00267"></a><span class="lineno"> 267</span> </div><div class="line"><a name="l00268"></a><span class="lineno"> 268</span> Pretty annoying indeed. Using a loop is the recommended approach.</div><div class="line"><a name="l00269"></a><span class="lineno"> 269</span> </div><div class="line"><a name="l00270"></a><span class="lineno"> 270</span> The resources also accept arbitrary user-data that won't be touched in any</div><div class="line"><a name="l00271"></a><span class="lineno"> 271</span> case.<br/></div><div class="line"><a name="l00272"></a><span class="lineno"> 272</span> Users can set and get them through the `data` member function as it follows:</div><div class="line"><a name="l00273"></a><span class="lineno"> 273</span> </div><div class="line"><a name="l00274"></a><span class="lineno"> 274</span> ```cpp</div><div class="line"><a name="l00275"></a><span class="lineno"> 275</span> resource->data(std::make_shared<int>(42));</div><div class="line"><a name="l00276"></a><span class="lineno"> 276</span> std::shared_ptr<void> data = resource->data();</div><div class="line"><a name="l00277"></a><span class="lineno"> 277</span> ```</div><div class="line"><a name="l00278"></a><span class="lineno"> 278</span> </div><div class="line"><a name="l00279"></a><span class="lineno"> 279</span> Resources expect a `std::shared_pointer<void>` and return it, therefore any kind</div><div class="line"><a name="l00280"></a><span class="lineno"> 280</span> of data is welcome.<br/></div><div class="line"><a name="l00281"></a><span class="lineno"> 281</span> Users can explicitly specify a type other than `void` when calling the `data`</div><div class="line"><a name="l00282"></a><span class="lineno"> 282</span> member function:</div><div class="line"><a name="l00283"></a><span class="lineno"> 283</span> </div><div class="line"><a name="l00284"></a><span class="lineno"> 284</span> ```cpp</div><div class="line"><a name="l00285"></a><span class="lineno"> 285</span> std::shared_ptr<int> data = resource->data<int>();</div><div class="line"><a name="l00286"></a><span class="lineno"> 286</span> ```</div><div class="line"><a name="l00287"></a><span class="lineno"> 287</span> </div><div class="line"><a name="l00288"></a><span class="lineno"> 288</span> Remember from the previous section that a handle will keep itself alive until</div><div class="line"><a name="l00289"></a><span class="lineno"> 289</span> one invokes the `close` member function on it.<br/></div><div class="line"><a name="l00290"></a><span class="lineno"> 290</span> To know what are the handles that are still alive and bound to a given loop,</div><div class="line"><a name="l00291"></a><span class="lineno"> 291</span> just do the following:</div><div class="line"><a name="l00292"></a><span class="lineno"> 292</span> </div><div class="line"><a name="l00293"></a><span class="lineno"> 293</span> ```cpp</div><div class="line"><a name="l00294"></a><span class="lineno"> 294</span> loop.walk([](uvw::BaseHandle &){ /* application code here */ });</div><div class="line"><a name="l00295"></a><span class="lineno"> 295</span> ```</div><div class="line"><a name="l00296"></a><span class="lineno"> 296</span> </div><div class="line"><a name="l00297"></a><span class="lineno"> 297</span> `BaseHandle` exposes a few methods and cannot be promoted to the original type</div><div class="line"><a name="l00298"></a><span class="lineno"> 298</span> of the handle (even though `type` and `category` member functions fill the gap</div><div class="line"><a name="l00299"></a><span class="lineno"> 299</span> somehow).<br/></div><div class="line"><a name="l00300"></a><span class="lineno"> 300</span> Anyway, it can be used to close the handle that originated from it. As an</div><div class="line"><a name="l00301"></a><span class="lineno"> 301</span> example, all the pending handles can be closed easily as it follows:</div><div class="line"><a name="l00302"></a><span class="lineno"> 302</span> </div><div class="line"><a name="l00303"></a><span class="lineno"> 303</span> ```cpp</div><div class="line"><a name="l00304"></a><span class="lineno"> 304</span> loop.walk([](uvw::BaseHandle &h){ h.close(); });</div><div class="line"><a name="l00305"></a><span class="lineno"> 305</span> ```</div><div class="line"><a name="l00306"></a><span class="lineno"> 306</span> </div><div class="line"><a name="l00307"></a><span class="lineno"> 307</span> No need to keep track of them.</div><div class="line"><a name="l00308"></a><span class="lineno"> 308</span> </div><div class="line"><a name="l00309"></a><span class="lineno"> 309</span> To know what are the available resources' types, please refer the API reference.</div><div class="line"><a name="l00310"></a><span class="lineno"> 310</span> </div><div class="line"><a name="l00311"></a><span class="lineno"> 311</span> ## The event-based approach</div><div class="line"><a name="l00312"></a><span class="lineno"> 312</span> </div><div class="line"><a name="l00313"></a><span class="lineno"> 313</span> For `uvw` offers an event-based approach, resources are small event emitters</div><div class="line"><a name="l00314"></a><span class="lineno"> 314</span> to which listeners can be attached.<br/></div><div class="line"><a name="l00315"></a><span class="lineno"> 315</span> Attaching a listener to a resource is the recommended way to be notified about</div><div class="line"><a name="l00316"></a><span class="lineno"> 316</span> changes.<br/></div><div class="line"><a name="l00317"></a><span class="lineno"> 317</span> Listeners must be callable objects of type `void(EventType &, ResourceType &)`,</div><div class="line"><a name="l00318"></a><span class="lineno"> 318</span> where:</div><div class="line"><a name="l00319"></a><span class="lineno"> 319</span> </div><div class="line"><a name="l00320"></a><span class="lineno"> 320</span> * `EventType` is the type of the event for which they have been designed.</div><div class="line"><a name="l00321"></a><span class="lineno"> 321</span> * `ResourceType` is the type of the resource that has originated the event.</div><div class="line"><a name="l00322"></a><span class="lineno"> 322</span> </div><div class="line"><a name="l00323"></a><span class="lineno"> 323</span> It means that the following function types are all valid:</div><div class="line"><a name="l00324"></a><span class="lineno"> 324</span> </div><div class="line"><a name="l00325"></a><span class="lineno"> 325</span> * `void(EventType &, ResourceType &)`</div><div class="line"><a name="l00326"></a><span class="lineno"> 326</span> * `void(const EventType &, ResourceType &)`</div><div class="line"><a name="l00327"></a><span class="lineno"> 327</span> * `void(EventType &, const ResourceType &)`</div><div class="line"><a name="l00328"></a><span class="lineno"> 328</span> * `void(const EventType &, const ResourceType &)`</div><div class="line"><a name="l00329"></a><span class="lineno"> 329</span> </div><div class="line"><a name="l00330"></a><span class="lineno"> 330</span> Once more, please note that there is no need to keep around references to the</div><div class="line"><a name="l00331"></a><span class="lineno"> 331</span> resources: they will pass themselves as an argument whenever an event is</div><div class="line"><a name="l00332"></a><span class="lineno"> 332</span> published.</div><div class="line"><a name="l00333"></a><span class="lineno"> 333</span> </div><div class="line"><a name="l00334"></a><span class="lineno"> 334</span> There exist two methods to attach an event to a resource:</div><div class="line"><a name="l00335"></a><span class="lineno"> 335</span> </div><div class="line"><a name="l00336"></a><span class="lineno"> 336</span> * `resource.once<EventType>(listener)`: the listener will be automatically</div><div class="line"><a name="l00337"></a><span class="lineno"> 337</span>  removed after the first event of the given type.</div><div class="line"><a name="l00338"></a><span class="lineno"> 338</span> * `resource.on<EventType>(listener)`: to be used for long-running listeners.</div><div class="line"><a name="l00339"></a><span class="lineno"> 339</span> </div><div class="line"><a name="l00340"></a><span class="lineno"> 340</span> Both of them return an object of type `ResourceType::Connection` (as an example,</div><div class="line"><a name="l00341"></a><span class="lineno"> 341</span> `TCPHandle::Connection`).<br/></div><div class="line"><a name="l00342"></a><span class="lineno"> 342</span> A connection object can be used later as an argument to the `erase` member</div><div class="line"><a name="l00343"></a><span class="lineno"> 343</span> function of the resource to remove the listener.<br/></div><div class="line"><a name="l00344"></a><span class="lineno"> 344</span> There exists also the `clear` member function to drop all the listeners at once.</div><div class="line"><a name="l00345"></a><span class="lineno"> 345</span> </div><div class="line"><a name="l00346"></a><span class="lineno"> 346</span> Almost all the resources use to emit `ErrorEvent` events in case of errors.<br/></div><div class="line"><a name="l00347"></a><span class="lineno"> 347</span> All the other events are specific for the given resource and documented in the</div><div class="line"><a name="l00348"></a><span class="lineno"> 348</span> API reference.</div><div class="line"><a name="l00349"></a><span class="lineno"> 349</span> </div><div class="line"><a name="l00350"></a><span class="lineno"> 350</span> The code below shows how to create a simple tcp server using `uvw`:</div><div class="line"><a name="l00351"></a><span class="lineno"> 351</span> </div><div class="line"><a name="l00352"></a><span class="lineno"> 352</span> ```cpp</div><div class="line"><a name="l00353"></a><span class="lineno"> 353</span> auto loop = uvw::Loop::getDefault();</div><div class="line"><a name="l00354"></a><span class="lineno"> 354</span> auto tcp = loop.resource<uvw::TCPHandle>();</div><div class="line"><a name="l00355"></a><span class="lineno"> 355</span> </div><div class="line"><a name="l00356"></a><span class="lineno"> 356</span> tcp->on<uvw::ErrorEvent>([](const uvw::ErrorEvent &, uvw::TCPHandle &) { /* something went wrong */ });</div><div class="line"><a name="l00357"></a><span class="lineno"> 357</span> </div><div class="line"><a name="l00358"></a><span class="lineno"> 358</span> tcp->on<uvw::ListenEvent>([](const uvw::ListenEvent &, uvw::TCPHandle &srv) {</div><div class="line"><a name="l00359"></a><span class="lineno"> 359</span>  std::shared_ptr<uvw::TCPHandle> client = srv.loop().resource<uvw::TCPHandle>();</div><div class="line"><a name="l00360"></a><span class="lineno"> 360</span>  client->once<uvw::EndEvent>([](const uvw::EndEvent &, uvw::TCPHandle &client) { client.close(); });</div><div class="line"><a name="l00361"></a><span class="lineno"> 361</span>  client->on<uvw::DataEvent>([](const uvw::DataEvent &, uvw::TCPHandle &) { /* data received */ });</div><div class="line"><a name="l00362"></a><span class="lineno"> 362</span>  srv.accept(*client);</div><div class="line"><a name="l00363"></a><span class="lineno"> 363</span>  client->read();</div><div class="line"><a name="l00364"></a><span class="lineno"> 364</span> });</div><div class="line"><a name="l00365"></a><span class="lineno"> 365</span> </div><div class="line"><a name="l00366"></a><span class="lineno"> 366</span> tcp->bind("127.0.0.1", 4242);</div><div class="line"><a name="l00367"></a><span class="lineno"> 367</span> tcp->listen();</div><div class="line"><a name="l00368"></a><span class="lineno"> 368</span> ```</div><div class="line"><a name="l00369"></a><span class="lineno"> 369</span> </div><div class="line"><a name="l00370"></a><span class="lineno"> 370</span> Note also that `uvw::TCPHandle` already supports _IPv6_ out-of-the-box. The</div><div class="line"><a name="l00371"></a><span class="lineno"> 371</span> statement above is equivalent to `tcp->bind<uvw::IPv4>("127.0.0.1", 4242)`.<br/></div><div class="line"><a name="l00372"></a><span class="lineno"> 372</span> It's suffice to explicitly specify `uvw::IPv6` as the underlying protocol to use</div><div class="line"><a name="l00373"></a><span class="lineno"> 373</span> it.</div><div class="line"><a name="l00374"></a><span class="lineno"> 374</span> </div><div class="line"><a name="l00375"></a><span class="lineno"> 375</span> The API reference is the recommended documentation for further details about</div><div class="line"><a name="l00376"></a><span class="lineno"> 376</span> resources and their methods.</div><div class="line"><a name="l00377"></a><span class="lineno"> 377</span> </div><div class="line"><a name="l00378"></a><span class="lineno"> 378</span> ## Going raw</div><div class="line"><a name="l00379"></a><span class="lineno"> 379</span> </div><div class="line"><a name="l00380"></a><span class="lineno"> 380</span> In case users need to use functionalities not wrapped yet by `uvw` or if they</div><div class="line"><a name="l00381"></a><span class="lineno"> 381</span> want to get the underlying data structures as defined by `libuv` for some other</div><div class="line"><a name="l00382"></a><span class="lineno"> 382</span> reasons, almost all the classes in `uvw` give direct access to them.<br/></div><div class="line"><a name="l00383"></a><span class="lineno"> 383</span> Please, note that this functions should not be used directly unless users know</div><div class="line"><a name="l00384"></a><span class="lineno"> 384</span> exactly what they are doing and what are the risks. Going raw is dangerous,</div><div class="line"><a name="l00385"></a><span class="lineno"> 385</span> mainly because the lifetime management of a loop, a handle or a request is</div><div class="line"><a name="l00386"></a><span class="lineno"> 386</span> completely in charge to the library and working around it could quickly break</div><div class="line"><a name="l00387"></a><span class="lineno"> 387</span> things.</div><div class="line"><a name="l00388"></a><span class="lineno"> 388</span> </div><div class="line"><a name="l00389"></a><span class="lineno"> 389</span> That being said, _going raw_ is a matter of using the `raw` member functions:</div><div class="line"><a name="l00390"></a><span class="lineno"> 390</span> </div><div class="line"><a name="l00391"></a><span class="lineno"> 391</span> ```cpp</div><div class="line"><a name="l00392"></a><span class="lineno"> 392</span> auto loop = uvw::Loop::getDefault();</div><div class="line"><a name="l00393"></a><span class="lineno"> 393</span> auto tcp = loop.resource<uvw::TCPHandle>();</div><div class="line"><a name="l00394"></a><span class="lineno"> 394</span> </div><div class="line"><a name="l00395"></a><span class="lineno"> 395</span> uv_loop_t *raw = loop->raw();</div><div class="line"><a name="l00396"></a><span class="lineno"> 396</span> uv_tcp_t *handle = tcp->raw();</div><div class="line"><a name="l00397"></a><span class="lineno"> 397</span> ```</div><div class="line"><a name="l00398"></a><span class="lineno"> 398</span> </div><div class="line"><a name="l00399"></a><span class="lineno"> 399</span> Go the raw way at your own risk, but do not expect any support in case of bugs.</div><div class="line"><a name="l00400"></a><span class="lineno"> 400</span> </div><div class="line"><a name="l00401"></a><span class="lineno"> 401</span> # Contributors</div><div class="line"><a name="l00402"></a><span class="lineno"> 402</span> </div><div class="line"><a name="l00403"></a><span class="lineno"> 403</span> If you want to contribute, please send patches as pull requests against the</div><div class="line"><a name="l00404"></a><span class="lineno"> 404</span> branch master.<br/></div><div class="line"><a name="l00405"></a><span class="lineno"> 405</span> Check the</div><div class="line"><a name="l00406"></a><span class="lineno"> 406</span> [contributors list](https://github.com/skypjack/uvw/blob/master/AUTHORS) to see</div><div class="line"><a name="l00407"></a><span class="lineno"> 407</span> who has partecipated so far.</div><div class="line"><a name="l00408"></a><span class="lineno"> 408</span> </div><div class="line"><a name="l00409"></a><span class="lineno"> 409</span> # License</div><div class="line"><a name="l00410"></a><span class="lineno"> 410</span> </div><div class="line"><a name="l00411"></a><span class="lineno"> 411</span> Code and documentation Copyright (c) 2016-2019 Michele Caini.<br/></div><div class="line"><a name="l00412"></a><span class="lineno"> 412</span> Logo Copyright (c) 2018-2019 Richard Caseres.</div><div class="line"><a name="l00413"></a><span class="lineno"> 413</span> </div><div class="line"><a name="l00414"></a><span class="lineno"> 414</span> Code released under</div><div class="line"><a name="l00415"></a><span class="lineno"> 415</span> [the MIT license](https://github.com/skypjack/uvw/blob/master/LICENSE).</div><div class="line"><a name="l00416"></a><span class="lineno"> 416</span> Documentation released under</div><div class="line"><a name="l00417"></a><span class="lineno"> 417</span> [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/).<br/></div><div class="line"><a name="l00418"></a><span class="lineno"> 418</span> Logo released under</div><div class="line"><a name="l00419"></a><span class="lineno"> 419</span> [CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/).</div><div class="line"><a name="l00420"></a><span class="lineno"> 420</span> </div><div class="line"><a name="l00421"></a><span class="lineno"> 421</span> <!--</div><div class="line"><a name="l00422"></a><span class="lineno"> 422</span> @cond TURN_OFF_DOXYGEN</div><div class="line"><a name="l00423"></a><span class="lineno"> 423</span> --></div><div class="line"><a name="l00424"></a><span class="lineno"> 424</span> # Support</div><div class="line"><a name="l00425"></a><span class="lineno"> 425</span> </div><div class="line"><a name="l00426"></a><span class="lineno"> 426</span> ## Patreon</div><div class="line"><a name="l00427"></a><span class="lineno"> 427</span> </div><div class="line"><a name="l00428"></a><span class="lineno"> 428</span> Become a [patron](https://www.patreon.com/bePatron?c=1772573) and get access to</div><div class="line"><a name="l00429"></a><span class="lineno"> 429</span> extra content, help me spend more time on the projects you love and create new</div><div class="line"><a name="l00430"></a><span class="lineno"> 430</span> ones for you. Your support will help me to continue the work done so far and</div><div class="line"><a name="l00431"></a><span class="lineno"> 431</span> make it more professional and feature-rich every day.<br/></div><div class="line"><a name="l00432"></a><span class="lineno"> 432</span> It takes very little to</div><div class="line"><a name="l00433"></a><span class="lineno"> 433</span> [become a patron](https://www.patreon.com/bePatron?c=1772573) and thus help the</div><div class="line"><a name="l00434"></a><span class="lineno"> 434</span> software you use every day. Don't miss the chance.</div><div class="line"><a name="l00435"></a><span class="lineno"> 435</span> </div><div class="line"><a name="l00436"></a><span class="lineno"> 436</span> ## Donation</div><div class="line"><a name="l00437"></a><span class="lineno"> 437</span> </div><div class="line"><a name="l00438"></a><span class="lineno"> 438</span> Developing and maintaining `uvw` takes some time and lots of coffee. It still</div><div class="line"><a name="l00439"></a><span class="lineno"> 439</span> lacks a proper test suite, documentation is partially incomplete and not all</div><div class="line"><a name="l00440"></a><span class="lineno"> 440</span> functionalities have been fully implemented yet.<br/></div><div class="line"><a name="l00441"></a><span class="lineno"> 441</span> If you want to support this project, you can offer me an espresso. I'm from</div><div class="line"><a name="l00442"></a><span class="lineno"> 442</span> Italy, we're used to turning the best coffee ever in code. If you find that it's</div><div class="line"><a name="l00443"></a><span class="lineno"> 443</span> not enough, feel free to support me the way you prefer.<br/></div><div class="line"><a name="l00444"></a><span class="lineno"> 444</span> Take a look at the donation button at the top of the page for more details or</div><div class="line"><a name="l00445"></a><span class="lineno"> 445</span> just click [here](https://www.paypal.me/skypjack).</div><div class="line"><a name="l00446"></a><span class="lineno"> 446</span> </div><div class="line"><a name="l00447"></a><span class="lineno"> 447</span> ## Hire me</div><div class="line"><a name="l00448"></a><span class="lineno"> 448</span> </div><div class="line"><a name="l00449"></a><span class="lineno"> 449</span> If you start using `uvw` and need help, if you want a new feature and want me</div><div class="line"><a name="l00450"></a><span class="lineno"> 450</span> to give it the highest priority, if you have any other reason to contact me:</div><div class="line"><a name="l00451"></a><span class="lineno"> 451</span> do not hesitate. I'm available for hiring.<br/></div><div class="line"><a name="l00452"></a><span class="lineno"> 452</span> Feel free to take a look at my [profile](https://github.com/skypjack) and</div><div class="line"><a name="l00453"></a><span class="lineno"> 453</span> contact me by mail.</div><div class="line"><a name="l00454"></a><span class="lineno"> 454</span> <!--</div><div class="line"><a name="l00455"></a><span class="lineno"> 455</span> @endcond TURN_OFF_DOXYGEN</div><div class="line"><a name="l00456"></a><span class="lineno"> 456</span> --></div></div><!-- fragment --></div><!-- contents -->
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