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| <li class="navelem"><a class="el" href="dir_51d145386ec5f52aa06ebf5e46944abc.html">iceberg</a></li><li class="navelem"><a class="el" href="dir_6a066966226cd78a6111c1015733de08.html">util</a></li> </ul> |
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| <div class="headertitle"><div class="title">iterator.h</div></div> |
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| <a href="iterator_8h.html">Go to the documentation of this file.</a><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">#pragma once</span></div> |
| <div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</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">#include <deque></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="preprocessor">#include <type_traits></span></div> |
| <div class="line"><a id="l00028" name="l00028"></a><span class="lineno"> 28</span><span class="preprocessor">#include <utility></span></div> |
| <div class="line"><a id="l00029" name="l00029"></a><span class="lineno"> 29</span><span class="preprocessor">#include <vector></span></div> |
| <div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span> </div> |
| <div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span><span class="preprocessor">#include "<a class="code" href="result_8h.html">iceberg/result.h</a>"</span></div> |
| <div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span> </div> |
| <div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespaceiceberg.html">iceberg</a> {</div> |
| <div class="line"><a id="l00034" name="l00034"></a><span class="lineno"> 34</span> </div> |
| <div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span><span class="keyword">template</span> <<span class="keyword">typename</span> T></div> |
| <div class="foldopen" id="foldopen00045" data-start="{" data-end="};"> |
| <div class="line"><a id="l00045" name="l00045"></a><span class="lineno"><a class="line" href="classiceberg_1_1Iterator.html"> 45</a></span><span class="keyword">class </span><a class="code hl_class" href="classiceberg_1_1Iterator.html">Iterator</a> {</div> |
| <div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span> <span class="keyword">public</span>:</div> |
| <div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span> <span class="keyword">virtual</span> <a class="code hl_class" href="classiceberg_1_1Iterator.html">~Iterator</a>() = <span class="keywordflow">default</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> <a class="code hl_class" href="classiceberg_1_1Iterator.html">Iterator</a>() = <span class="keywordflow">default</span>;</div> |
| <div class="line"><a id="l00050" name="l00050"></a><span class="lineno"> 50</span> <a class="code hl_class" href="classiceberg_1_1Iterator.html">Iterator</a>(<span class="keyword">const</span> <a class="code hl_class" href="classiceberg_1_1Iterator.html">Iterator</a>&) = <span class="keyword">delete</span>;</div> |
| <div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span> <a class="code hl_class" href="classiceberg_1_1Iterator.html">Iterator</a>& operator=(<span class="keyword">const</span> <a class="code hl_class" href="classiceberg_1_1Iterator.html">Iterator</a>&) = <span class="keyword">delete</span>;</div> |
| <div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span> <a class="code hl_class" href="classiceberg_1_1Iterator.html">Iterator</a>(<a class="code hl_class" href="classiceberg_1_1Iterator.html">Iterator</a>&&) <span class="keyword">noexcept</span> = <span class="keywordflow">default</span>;</div> |
| <div class="line"><a id="l00053" name="l00053"></a><span class="lineno"> 53</span> <a class="code hl_class" href="classiceberg_1_1Iterator.html">Iterator</a>& operator=(<a class="code hl_class" href="classiceberg_1_1Iterator.html">Iterator</a>&&) <span class="keyword">noexcept</span> = <span class="keywordflow">default</span>;</div> |
| <div class="line"><a id="l00054" name="l00054"></a><span class="lineno"> 54</span> </div> |
| <div class="foldopen" id="foldopen00059" data-start="{" data-end="}"> |
| <div class="line"><a id="l00059" name="l00059"></a><span class="lineno"><a class="line" href="classiceberg_1_1Iterator.html#a0a5d3f0cf558d9105317ea80993f96c4"> 59</a></span> <a class="code hl_typedef" href="namespaceiceberg.html#a9d5594e371beb516b0120e07e69d3af6">Result<std::optional<T></a>> <a class="code hl_function" href="classiceberg_1_1Iterator.html#a0a5d3f0cf558d9105317ea80993f96c4">Next</a>() {</div> |
| <div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span> <span class="keywordflow">if</span> (error_.has_value()) {</div> |
| <div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span> <span class="keywordflow">return</span> std::unexpected(*error_);</div> |
| <div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span> }</div> |
| <div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span> <span class="keywordflow">if</span> (finished_) {</div> |
| <div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span> <span class="keywordflow">return</span> std::nullopt;</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> </div> |
| <div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span> <span class="keyword">auto</span> result = <a class="code hl_function" href="classiceberg_1_1Iterator.html#a1bbfc3019cd9a5e373f2a515e0533199">NextImpl</a>();</div> |
| <div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span> <span class="keywordflow">if</span> (!result.has_value()) {</div> |
| <div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span> error_ = result.error();</div> |
| <div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span> } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (!result.value().has_value()) {</div> |
| <div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span> finished_ = <span class="keyword">true</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> <span class="keywordflow">return</span> result;</div> |
| <div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span> }</div> |
| </div> |
| <div class="line"><a id="l00075" name="l00075"></a><span class="lineno"> 75</span> </div> |
| <div class="foldopen" id="foldopen00077" data-start="{" data-end="}"> |
| <div class="line"><a id="l00077" name="l00077"></a><span class="lineno"><a class="line" href="classiceberg_1_1Iterator.html#abae2fe7a3310a023ff0597aa68b986f2"> 77</a></span> <a class="code hl_typedef" href="namespaceiceberg.html#a9d5594e371beb516b0120e07e69d3af6">Result<std::vector<T></a>> <a class="code hl_function" href="classiceberg_1_1Iterator.html#abae2fe7a3310a023ff0597aa68b986f2">ToVector</a>() {</div> |
| <div class="line"><a id="l00078" name="l00078"></a><span class="lineno"> 78</span> <span class="keyword">auto</span> collect = [<span class="keyword">this</span>](<span class="keyword">auto</span>& values, <span class="keyword">auto</span> append,</div> |
| <div class="line"><a id="l00079" name="l00079"></a><span class="lineno"> 79</span> <span class="keyword">auto</span> finish) -> <a class="code hl_typedef" href="namespaceiceberg.html#a9d5594e371beb516b0120e07e69d3af6">Result</a><std::vector<T>> {</div> |
| <div class="line"><a id="l00080" name="l00080"></a><span class="lineno"> 80</span> <span class="keywordflow">while</span> (<span class="keyword">true</span>) {</div> |
| <div class="line"><a id="l00081" name="l00081"></a><span class="lineno"> 81</span> <span class="keyword">auto</span> result = <a class="code hl_function" href="classiceberg_1_1Iterator.html#a0a5d3f0cf558d9105317ea80993f96c4">Next</a>();</div> |
| <div class="line"><a id="l00082" name="l00082"></a><span class="lineno"> 82</span> <span class="keywordflow">if</span> (!result.has_value()) {</div> |
| <div class="line"><a id="l00083" name="l00083"></a><span class="lineno"> 83</span> <span class="keywordflow">return</span> std::unexpected(std::move(result.error()));</div> |
| <div class="line"><a id="l00084" name="l00084"></a><span class="lineno"> 84</span> }</div> |
| <div class="line"><a id="l00085" name="l00085"></a><span class="lineno"> 85</span> <span class="keyword">auto</span>& value = result.value();</div> |
| <div class="line"><a id="l00086" name="l00086"></a><span class="lineno"> 86</span> <span class="keywordflow">if</span> (!value.has_value()) {</div> |
| <div class="line"><a id="l00087" name="l00087"></a><span class="lineno"> 87</span> <span class="keywordflow">return</span> finish(values);</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> append(values, value.value());</div> |
| <div class="line"><a id="l00090" name="l00090"></a><span class="lineno"> 90</span> }</div> |
| <div class="line"><a id="l00091" name="l00091"></a><span class="lineno"> 91</span> };</div> |
| <div class="line"><a id="l00092" name="l00092"></a><span class="lineno"> 92</span> </div> |
| <div class="line"><a id="l00093" name="l00093"></a><span class="lineno"> 93</span> <span class="keywordflow">if</span> <span class="keyword">constexpr</span> (!std::is_move_constructible_v<T>) {</div> |
| <div class="line"><a id="l00094" name="l00094"></a><span class="lineno"> 94</span> <span class="keyword">static_assert</span>(std::is_copy_constructible_v<T>,</div> |
| <div class="line"><a id="l00095" name="l00095"></a><span class="lineno"> 95</span> <span class="stringliteral">"Iterator::ToVector requires T to be move- or copy-constructible"</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> <span class="comment">// For strictly copy-only T, collecting directly into a vector can repeatedly copy</span></div> |
| <div class="line"><a id="l00098" name="l00098"></a><span class="lineno"> 98</span> <span class="comment">// previously collected elements during vector growth. Stage values in a deque,</span></div> |
| <div class="line"><a id="l00099" name="l00099"></a><span class="lineno"> 99</span> <span class="comment">// then copy once into an exactly sized vector.</span></div> |
| <div class="line"><a id="l00100" name="l00100"></a><span class="lineno"> 100</span> std::deque<T> values;</div> |
| <div class="line"><a id="l00101" name="l00101"></a><span class="lineno"> 101</span> <span class="keywordflow">return</span> collect(</div> |
| <div class="line"><a id="l00102" name="l00102"></a><span class="lineno"> 102</span> values, [](<span class="keyword">auto</span>& destination, <span class="keyword">const</span> T& value) { destination.push_back(value); },</div> |
| <div class="line"><a id="l00103" name="l00103"></a><span class="lineno"> 103</span> [](<span class="keyword">const</span> <span class="keyword">auto</span>& source) {</div> |
| <div class="line"><a id="l00104" name="l00104"></a><span class="lineno"> 104</span> <span class="keywordflow">return</span> std::vector<T>(source.cbegin(), source.cend());</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> std::vector<T> values;</div> |
| <div class="line"><a id="l00108" name="l00108"></a><span class="lineno"> 108</span> <span class="keywordflow">return</span> collect(</div> |
| <div class="line"><a id="l00109" name="l00109"></a><span class="lineno"> 109</span> values,</div> |
| <div class="line"><a id="l00110" name="l00110"></a><span class="lineno"> 110</span> [](<span class="keyword">auto</span>& destination, T& value) {</div> |
| <div class="line"><a id="l00111" name="l00111"></a><span class="lineno"> 111</span> destination.push_back(std::move_if_noexcept(value));</div> |
| <div class="line"><a id="l00112" name="l00112"></a><span class="lineno"> 112</span> },</div> |
| <div class="line"><a id="l00113" name="l00113"></a><span class="lineno"> 113</span> [](<span class="keyword">auto</span>& source) { <span class="keywordflow">return</span> std::move(source); });</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> }</div> |
| </div> |
| <div class="line"><a id="l00116" name="l00116"></a><span class="lineno"> 116</span> </div> |
| <div class="line"><a id="l00117" name="l00117"></a><span class="lineno"> 117</span> <span class="keyword">protected</span>:</div> |
| <div class="line"><a id="l00122" name="l00122"></a><span class="lineno"><a class="line" href="classiceberg_1_1Iterator.html#a1bbfc3019cd9a5e373f2a515e0533199"> 122</a></span> <span class="keyword">virtual</span> <a class="code hl_typedef" href="namespaceiceberg.html#a9d5594e371beb516b0120e07e69d3af6">Result<std::optional<T></a>> <a class="code hl_function" href="classiceberg_1_1Iterator.html#a1bbfc3019cd9a5e373f2a515e0533199">NextImpl</a>() = 0;</div> |
| <div class="line"><a id="l00123" name="l00123"></a><span class="lineno"> 123</span> </div> |
| <div class="line"><a id="l00124" name="l00124"></a><span class="lineno"> 124</span> <span class="keyword">private</span>:</div> |
| <div class="line"><a id="l00125" name="l00125"></a><span class="lineno"> 125</span> <span class="keywordtype">bool</span> finished_ = <span class="keyword">false</span>;</div> |
| <div class="line"><a id="l00126" name="l00126"></a><span class="lineno"> 126</span> std::optional<Error> error_;</div> |
| <div class="line"><a id="l00127" name="l00127"></a><span class="lineno"> 127</span>};</div> |
| </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="comment">// namespace iceberg</span></div> |
| <div class="ttc" id="aclassiceberg_1_1Iterator_html"><div class="ttname"><a href="classiceberg_1_1Iterator.html">iceberg::Iterator</a></div><div class="ttdoc">A pull-based iterator whose reads may fail.</div><div class="ttdef"><b>Definition</b> iterator.h:45</div></div> |
| <div class="ttc" id="aclassiceberg_1_1Iterator_html_a0a5d3f0cf558d9105317ea80993f96c4"><div class="ttname"><a href="classiceberg_1_1Iterator.html#a0a5d3f0cf558d9105317ea80993f96c4">iceberg::Iterator::Next</a></div><div class="ttdeci">Result< std::optional< T > > Next()</div><div class="ttdoc">Return the next value, or std::nullopt when the iterator is exhausted.</div><div class="ttdef"><b>Definition</b> iterator.h:59</div></div> |
| <div class="ttc" id="aclassiceberg_1_1Iterator_html_a1bbfc3019cd9a5e373f2a515e0533199"><div class="ttname"><a href="classiceberg_1_1Iterator.html#a1bbfc3019cd9a5e373f2a515e0533199">iceberg::Iterator::NextImpl</a></div><div class="ttdeci">virtual Result< std::optional< T > > NextImpl()=0</div><div class="ttdoc">Produce the next value for Next().</div></div> |
| <div class="ttc" id="aclassiceberg_1_1Iterator_html_abae2fe7a3310a023ff0597aa68b986f2"><div class="ttname"><a href="classiceberg_1_1Iterator.html#abae2fe7a3310a023ff0597aa68b986f2">iceberg::Iterator::ToVector</a></div><div class="ttdeci">Result< std::vector< T > > ToVector()</div><div class="ttdoc">Consume the remaining values into a vector.</div><div class="ttdef"><b>Definition</b> iterator.h:77</div></div> |
| <div class="ttc" id="anamespaceiceberg_html"><div class="ttname"><a href="namespaceiceberg.html">iceberg</a></div><div class="ttdoc">Core Apache Iceberg C++ APIs.</div><div class="ttdef"><b>Definition</b> arrow_io_util.h:33</div></div> |
| <div class="ttc" id="anamespaceiceberg_html_a9d5594e371beb516b0120e07e69d3af6"><div class="ttname"><a href="namespaceiceberg.html#a9d5594e371beb516b0120e07e69d3af6">iceberg::Result</a></div><div class="ttdeci">std::expected< T, E > Result</div><div class="ttdoc">Result alias.</div><div class="ttdef"><b>Definition</b> result.h:88</div></div> |
| <div class="ttc" id="aresult_8h_html"><div class="ttname"><a href="result_8h.html">result.h</a></div><div class="ttdoc">Define Result, Status, and error helpers.</div></div> |
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