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| <li class="navelem"><a class="el" href="dir_bdd9a5d540de89e9fe90efdfc6973a4f.html">common</a></li><li class="navelem"><a class="el" href="dir_11fbc4217d50ab21044e5ad6614aede5.html">include</a></li> </ul> |
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| <div class="headertitle"><div class="title">optional.hpp</div></div> |
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| <div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno"> 1</span><span class="comment">/*</span></div> |
| <div class="line"><a id="l00002" name="l00002"></a><span class="lineno"> 2</span><span class="comment"> * Licensed to the Apache Software Foundation (ASF) under one</span></div> |
| <div class="line"><a id="l00003" name="l00003"></a><span class="lineno"> 3</span><span class="comment"> * or more contributor license agreements. See the NOTICE file</span></div> |
| <div class="line"><a id="l00004" name="l00004"></a><span class="lineno"> 4</span><span class="comment"> * distributed with this work for additional information</span></div> |
| <div class="line"><a id="l00005" name="l00005"></a><span class="lineno"> 5</span><span class="comment"> * regarding copyright ownership. The ASF licenses this file</span></div> |
| <div class="line"><a id="l00006" name="l00006"></a><span class="lineno"> 6</span><span class="comment"> * to you under the Apache License, Version 2.0 (the</span></div> |
| <div class="line"><a id="l00007" name="l00007"></a><span class="lineno"> 7</span><span class="comment"> * "License"); you may not use this file except in compliance</span></div> |
| <div class="line"><a id="l00008" name="l00008"></a><span class="lineno"> 8</span><span class="comment"> * with the License. You may obtain a copy of the License at</span></div> |
| <div class="line"><a id="l00009" name="l00009"></a><span class="lineno"> 9</span><span class="comment"> *</span></div> |
| <div class="line"><a id="l00010" name="l00010"></a><span class="lineno"> 10</span><span class="comment"> * http://www.apache.org/licenses/LICENSE-2.0</span></div> |
| <div class="line"><a id="l00011" name="l00011"></a><span class="lineno"> 11</span><span class="comment"> *</span></div> |
| <div class="line"><a id="l00012" name="l00012"></a><span class="lineno"> 12</span><span class="comment"> * Unless required by applicable law or agreed to in writing,</span></div> |
| <div class="line"><a id="l00013" name="l00013"></a><span class="lineno"> 13</span><span class="comment"> * software distributed under the License is distributed on an</span></div> |
| <div class="line"><a id="l00014" name="l00014"></a><span class="lineno"> 14</span><span class="comment"> * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY</span></div> |
| <div class="line"><a id="l00015" name="l00015"></a><span class="lineno"> 15</span><span class="comment"> * KIND, either express or implied. See the License for the</span></div> |
| <div class="line"><a id="l00016" name="l00016"></a><span class="lineno"> 16</span><span class="comment"> * specific language governing permissions and limitations</span></div> |
| <div class="line"><a id="l00017" name="l00017"></a><span class="lineno"> 17</span><span class="comment"> * under the License.</span></div> |
| <div class="line"><a id="l00018" name="l00018"></a><span class="lineno"> 18</span><span class="comment"> */</span></div> |
| <div class="line"><a id="l00019" name="l00019"></a><span class="lineno"> 19</span> </div> |
| <div class="line"><a id="l00020" name="l00020"></a><span class="lineno"> 20</span><span class="preprocessor">#ifndef _OPTIONAL_HPP_</span></div> |
| <div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</span><span class="preprocessor">#define _OPTIONAL_HPP_</span></div> |
| <div class="line"><a id="l00022" name="l00022"></a><span class="lineno"> 22</span> </div> |
| <div class="line"><a id="l00023" name="l00023"></a><span class="lineno"> 23</span><span class="comment">// This is a simplistic substitute for std::optional until we require C++17</span></div> |
| <div class="line"><a id="l00024" name="l00024"></a><span class="lineno"> 24</span> </div> |
| <div class="line"><a id="l00025" name="l00025"></a><span class="lineno"> 25</span><span class="preprocessor">#if (__cplusplus >= 201703L || (defined(_MSVC_LANG) && _MSVC_LANG >= 201703L))</span></div> |
| <div class="line"><a id="l00026" name="l00026"></a><span class="lineno"> 26</span><span class="preprocessor">#include <optional></span></div> |
| <div class="line"><a id="l00027" name="l00027"></a><span class="lineno"> 27</span><span class="keyword">using </span>std::optional;</div> |
| <div class="line"><a id="l00028" name="l00028"></a><span class="lineno"> 28</span><span class="preprocessor">#else</span></div> |
| <div class="line"><a id="l00029" name="l00029"></a><span class="lineno"> 29</span> </div> |
| <div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span><span class="preprocessor">#include <type_traits></span></div> |
| <div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span> </div> |
| <div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespacedatasketches.html">datasketches</a> {</div> |
| <div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span> </div> |
| <div class="line"><a id="l00034" name="l00034"></a><span class="lineno"> 34</span><span class="keyword">template</span><<span class="keyword">typename</span> T></div> |
| <div class="line"><a id="l00035" name="l00035"></a><span class="lineno"> 35</span><span class="keyword">class </span>optional {</div> |
| <div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span><span class="keyword">public</span>:</div> |
| <div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span> </div> |
| <div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span> optional() noexcept: initialized_(false) {}</div> |
| <div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span> </div> |
| <div class="line"><a id="l00040" name="l00040"></a><span class="lineno"> 40</span> optional(<span class="keyword">const</span> T& value) <span class="keyword">noexcept</span>(std::is_nothrow_copy_constructible<T>::value) {</div> |
| <div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span> <span class="keyword">new</span> (&value_) T(value);</div> |
| <div class="line"><a id="l00042" name="l00042"></a><span class="lineno"> 42</span> initialized_ = <span class="keyword">true</span>;</div> |
| <div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span> }</div> |
| <div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span> </div> |
| <div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span> optional(T&& value) <span class="keyword">noexcept</span>(std::is_nothrow_move_constructible<T>::value) {</div> |
| <div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span> <span class="keyword">new</span> (&value_) T(std::move(value));</div> |
| <div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span> initialized_ = <span class="keyword">true</span>;</div> |
| <div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span> }</div> |
| <div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span> </div> |
| <div class="line"><a id="l00050" name="l00050"></a><span class="lineno"> 50</span> <span class="comment">// conversion from compatible types</span></div> |
| <div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span> <span class="keyword">template</span><<span class="keyword">typename</span> TT></div> |
| <div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span> optional(<span class="keyword">const</span> optional<TT>& other) <span class="keyword">noexcept</span>(std::is_nothrow_constructible<T, TT>::value): initialized_(false) {</div> |
| <div class="line"><a id="l00053" name="l00053"></a><span class="lineno"> 53</span> <span class="keywordflow">if</span> (other.initialized_) {</div> |
| <div class="line"><a id="l00054" name="l00054"></a><span class="lineno"> 54</span> <span class="keyword">new</span> (&value_) T(other.value_);</div> |
| <div class="line"><a id="l00055" name="l00055"></a><span class="lineno"> 55</span> initialized_ = <span class="keyword">true</span>;</div> |
| <div class="line"><a id="l00056" name="l00056"></a><span class="lineno"> 56</span> }</div> |
| <div class="line"><a id="l00057" name="l00057"></a><span class="lineno"> 57</span> }</div> |
| <div class="line"><a id="l00058" name="l00058"></a><span class="lineno"> 58</span> </div> |
| <div class="line"><a id="l00059" name="l00059"></a><span class="lineno"> 59</span> optional(<span class="keyword">const</span> optional& other) <span class="keyword">noexcept</span>(std::is_nothrow_copy_constructible<T>::value): initialized_(false) {</div> |
| <div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span> <span class="keywordflow">if</span> (other.initialized_) {</div> |
| <div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span> <span class="keyword">new</span> (&value_) T(other.value_);</div> |
| <div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span> initialized_ = <span class="keyword">true</span>;</div> |
| <div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span> }</div> |
| <div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span> }</div> |
| <div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span> </div> |
| <div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span> optional(optional&& other) <span class="keyword">noexcept</span>(std::is_nothrow_move_constructible<T>::value): initialized_(false) {</div> |
| <div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span> <span class="keywordflow">if</span> (other.initialized_) {</div> |
| <div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span> <span class="keyword">new</span> (&value_) T(std::move(other.value_));</div> |
| <div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span> initialized_ = <span class="keyword">true</span>;</div> |
| <div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span> }</div> |
| <div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span> }</div> |
| <div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span> </div> |
| <div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span> ~optional() noexcept(std::is_nothrow_destructible<T>::value) {</div> |
| <div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span> <span class="keywordflow">if</span> (initialized_) value_.~T();</div> |
| <div class="line"><a id="l00075" name="l00075"></a><span class="lineno"> 75</span> }</div> |
| <div class="line"><a id="l00076" name="l00076"></a><span class="lineno"> 76</span> </div> |
| <div class="line"><a id="l00077" name="l00077"></a><span class="lineno"> 77</span> <span class="keyword">explicit</span> <span class="keyword">operator</span> bool() const noexcept {</div> |
| <div class="line"><a id="l00078" name="l00078"></a><span class="lineno"> 78</span> <span class="keywordflow">return</span> initialized_;</div> |
| <div class="line"><a id="l00079" name="l00079"></a><span class="lineno"> 79</span> }</div> |
| <div class="line"><a id="l00080" name="l00080"></a><span class="lineno"> 80</span> </div> |
| <div class="line"><a id="l00081" name="l00081"></a><span class="lineno"> 81</span> optional& operator=(<span class="keyword">const</span> optional& other)</div> |
| <div class="line"><a id="l00082" name="l00082"></a><span class="lineno"> 82</span> <span class="keyword">noexcept</span>(std::is_nothrow_copy_constructible<T>::value && std::is_nothrow_copy_assignable<T>::value) {</div> |
| <div class="line"><a id="l00083" name="l00083"></a><span class="lineno"> 83</span> <span class="keywordflow">if</span> (initialized_) {</div> |
| <div class="line"><a id="l00084" name="l00084"></a><span class="lineno"> 84</span> <span class="keywordflow">if</span> (other.initialized_) {</div> |
| <div class="line"><a id="l00085" name="l00085"></a><span class="lineno"> 85</span> value_ = other.value_;</div> |
| <div class="line"><a id="l00086" name="l00086"></a><span class="lineno"> 86</span> } <span class="keywordflow">else</span> {</div> |
| <div class="line"><a id="l00087" name="l00087"></a><span class="lineno"> 87</span> reset();</div> |
| <div class="line"><a id="l00088" name="l00088"></a><span class="lineno"> 88</span> }</div> |
| <div class="line"><a id="l00089" name="l00089"></a><span class="lineno"> 89</span> } <span class="keywordflow">else</span> {</div> |
| <div class="line"><a id="l00090" name="l00090"></a><span class="lineno"> 90</span> <span class="keywordflow">if</span> (other.initialized_) {</div> |
| <div class="line"><a id="l00091" name="l00091"></a><span class="lineno"> 91</span> <span class="keyword">new</span> (&value_) T(other.value_);</div> |
| <div class="line"><a id="l00092" name="l00092"></a><span class="lineno"> 92</span> initialized_ = <span class="keyword">true</span>;</div> |
| <div class="line"><a id="l00093" name="l00093"></a><span class="lineno"> 93</span> }</div> |
| <div class="line"><a id="l00094" name="l00094"></a><span class="lineno"> 94</span> }</div> |
| <div class="line"><a id="l00095" name="l00095"></a><span class="lineno"> 95</span> <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div> |
| <div class="line"><a id="l00096" name="l00096"></a><span class="lineno"> 96</span> }</div> |
| <div class="line"><a id="l00097" name="l00097"></a><span class="lineno"> 97</span> </div> |
| <div class="line"><a id="l00098" name="l00098"></a><span class="lineno"> 98</span> optional& operator=(optional&& other)</div> |
| <div class="line"><a id="l00099" name="l00099"></a><span class="lineno"> 99</span> <span class="keyword">noexcept</span>(std::is_nothrow_move_constructible<T>::value && std::is_nothrow_move_assignable<T>::value) {</div> |
| <div class="line"><a id="l00100" name="l00100"></a><span class="lineno"> 100</span> <span class="keywordflow">if</span> (initialized_) {</div> |
| <div class="line"><a id="l00101" name="l00101"></a><span class="lineno"> 101</span> <span class="keywordflow">if</span> (other.initialized_) {</div> |
| <div class="line"><a id="l00102" name="l00102"></a><span class="lineno"> 102</span> value_ = std::move(other.value_);</div> |
| <div class="line"><a id="l00103" name="l00103"></a><span class="lineno"> 103</span> } <span class="keywordflow">else</span> {</div> |
| <div class="line"><a id="l00104" name="l00104"></a><span class="lineno"> 104</span> reset();</div> |
| <div class="line"><a id="l00105" name="l00105"></a><span class="lineno"> 105</span> }</div> |
| <div class="line"><a id="l00106" name="l00106"></a><span class="lineno"> 106</span> } <span class="keywordflow">else</span> {</div> |
| <div class="line"><a id="l00107" name="l00107"></a><span class="lineno"> 107</span> <span class="keywordflow">if</span> (other.initialized_) {</div> |
| <div class="line"><a id="l00108" name="l00108"></a><span class="lineno"> 108</span> <span class="keyword">new</span> (&value_) T(std::move(other.value_));</div> |
| <div class="line"><a id="l00109" name="l00109"></a><span class="lineno"> 109</span> initialized_ = <span class="keyword">true</span>;</div> |
| <div class="line"><a id="l00110" name="l00110"></a><span class="lineno"> 110</span> }</div> |
| <div class="line"><a id="l00111" name="l00111"></a><span class="lineno"> 111</span> }</div> |
| <div class="line"><a id="l00112" name="l00112"></a><span class="lineno"> 112</span> <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div> |
| <div class="line"><a id="l00113" name="l00113"></a><span class="lineno"> 113</span> }</div> |
| <div class="line"><a id="l00114" name="l00114"></a><span class="lineno"> 114</span> </div> |
| <div class="line"><a id="l00115" name="l00115"></a><span class="lineno"> 115</span> <span class="keyword">template</span><<span class="keyword">typename</span>... Args></div> |
| <div class="line"><a id="l00116" name="l00116"></a><span class="lineno"> 116</span> <span class="keywordtype">void</span> emplace(Args&&... args) <span class="keyword">noexcept</span>(std::is_nothrow_constructible<T, Args...>::value) {</div> |
| <div class="line"><a id="l00117" name="l00117"></a><span class="lineno"> 117</span> <span class="keyword">new</span> (&value_) T(args...);</div> |
| <div class="line"><a id="l00118" name="l00118"></a><span class="lineno"> 118</span> initialized_ = <span class="keyword">true</span>;</div> |
| <div class="line"><a id="l00119" name="l00119"></a><span class="lineno"> 119</span> }</div> |
| <div class="line"><a id="l00120" name="l00120"></a><span class="lineno"> 120</span> </div> |
| <div class="line"><a id="l00121" name="l00121"></a><span class="lineno"> 121</span> T& operator*() & <span class="keyword">noexcept</span> { <span class="keywordflow">return</span> value_; }</div> |
| <div class="line"><a id="l00122" name="l00122"></a><span class="lineno"> 122</span> <span class="keyword">const</span> T& operator*() const & noexcept { <span class="keywordflow">return</span> value_; }</div> |
| <div class="line"><a id="l00123" name="l00123"></a><span class="lineno"> 123</span> T&& operator*() && <span class="keyword">noexcept</span> { <span class="keywordflow">return</span> std::move(value_); }</div> |
| <div class="line"><a id="l00124" name="l00124"></a><span class="lineno"> 124</span> <span class="keyword">const</span> T&& operator*() const && noexcept { <span class="keywordflow">return</span> std::move(value_); }</div> |
| <div class="line"><a id="l00125" name="l00125"></a><span class="lineno"> 125</span> </div> |
| <div class="line"><a id="l00126" name="l00126"></a><span class="lineno"> 126</span> T* operator->() noexcept { <span class="keywordflow">return</span> &value_; }</div> |
| <div class="line"><a id="l00127" name="l00127"></a><span class="lineno"> 127</span> <span class="keyword">const</span> T* operator->() const noexcept { <span class="keywordflow">return</span> &value_; }</div> |
| <div class="line"><a id="l00128" name="l00128"></a><span class="lineno"> 128</span> </div> |
| <div class="line"><a id="l00129" name="l00129"></a><span class="lineno"> 129</span> <span class="keywordtype">void</span> reset() noexcept(std::is_nothrow_destructible<T>::value) {</div> |
| <div class="line"><a id="l00130" name="l00130"></a><span class="lineno"> 130</span> <span class="keywordflow">if</span> (initialized_) value_.~T();</div> |
| <div class="line"><a id="l00131" name="l00131"></a><span class="lineno"> 131</span> initialized_ = <span class="keyword">false</span>;</div> |
| <div class="line"><a id="l00132" name="l00132"></a><span class="lineno"> 132</span> }</div> |
| <div class="line"><a id="l00133" name="l00133"></a><span class="lineno"> 133</span> </div> |
| <div class="line"><a id="l00134" name="l00134"></a><span class="lineno"> 134</span><span class="keyword">private</span>:</div> |
| <div class="line"><a id="l00135" name="l00135"></a><span class="lineno"> 135</span> <span class="keyword">union </span>{</div> |
| <div class="line"><a id="l00136" name="l00136"></a><span class="lineno"> 136</span> T value_;</div> |
| <div class="line"><a id="l00137" name="l00137"></a><span class="lineno"> 137</span> };</div> |
| <div class="line"><a id="l00138" name="l00138"></a><span class="lineno"> 138</span> <span class="keywordtype">bool</span> initialized_;</div> |
| <div class="line"><a id="l00139" name="l00139"></a><span class="lineno"> 139</span> </div> |
| <div class="line"><a id="l00140" name="l00140"></a><span class="lineno"> 140</span> <span class="comment">// for converting constructor</span></div> |
| <div class="line"><a id="l00141" name="l00141"></a><span class="lineno"> 141</span> <span class="keyword">template</span><<span class="keyword">typename</span> TT> <span class="keyword">friend</span> <span class="keyword">class </span>optional;</div> |
| <div class="line"><a id="l00142" name="l00142"></a><span class="lineno"> 142</span>};</div> |
| <div class="line"><a id="l00143" name="l00143"></a><span class="lineno"> 143</span> </div> |
| <div class="line"><a id="l00144" name="l00144"></a><span class="lineno"> 144</span>} <span class="comment">// namespace</span></div> |
| <div class="line"><a id="l00145" name="l00145"></a><span class="lineno"> 145</span> </div> |
| <div class="line"><a id="l00146" name="l00146"></a><span class="lineno"> 146</span><span class="preprocessor">#endif </span><span class="comment">// C++17</span></div> |
| <div class="line"><a id="l00147" name="l00147"></a><span class="lineno"> 147</span> </div> |
| <div class="line"><a id="l00148" name="l00148"></a><span class="lineno"> 148</span><span class="preprocessor">#endif </span><span class="comment">// _OPTIONAL_HPP_</span></div> |
| <div class="ttc" id="anamespacedatasketches_html"><div class="ttname"><a href="namespacedatasketches.html">datasketches</a></div><div class="ttdoc">DataSketches namespace.</div><div class="ttdef"><b>Definition</b> binomial_bounds.hpp:38</div></div> |
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