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      <dt style="clear: both; float: left; font-weight: bold; width: 8em">Author</dt>
      <dd style="margin-left: 8.5em">susumu.yata &lt;susum****@gmail*****&gt;</dd>
      <dt style="clear: both; float: left; font-weight: bold; width: 8em">Date</dt>
      <dd style="margin-left: 8.5em">2014-06-17 13:19:42 +0900 (Tue, 17 Jun 2014)</dd>
      <dt style="clear: both; float: left; font-weight: bold; width: 8em">New Revision</dt>
      <dd style="margin-left: 8.5em"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de">8254a1d107547bc47eeb64a276f7cb6412a553de</a></dd>
      <dt style="clear: both; float: left; font-weight: bold; width: 8em">Message</dt>
      <dd style="margin-left: 8.5em"><pre style="border: 1px solid #aaa; font-family: Consolas, Menlo, &quot;Liberation Mono&quot;, Courier, monospace; line-height: 1.2; padding: 0.5em; width: auto">Rename create_*_node() to push_*().</pre></dd>
      <dt style="clear: both; float: left; font-weight: bold; width: 8em">Modified files</dt>
      <dd style="margin-left: 8.5em">
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          <li><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#diff-0">new-interface/expression-builder.hpp</a></li>
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<pre style="border: 0; font-family: Consolas, Menlo, &quot;Liberation Mono&quot;, Courier, monospace; line-height: 1.2; margin: 0; padding: 0.5em; white-space: normal; width: auto"><span class="diff-header" style="background-color: #eaf2f5; color: #999999; display: block; white-space: pre">  Modified: new-interface/expression-builder.hpp (+20 -31)</span>
<span class="diff-header-mark" style="background-color: #eaf2f5; color: #999999; display: block; white-space: pre">===================================================================</span>
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<pre style="border: 0; font-family: Consolas, Menlo, &quot;Liberation Mono&quot;, Courier, monospace; line-height: 1.2; margin: 0; padding: 0.5em; white-space: normal; width: auto"><span class="diff-line-number-hunk-header" style="display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0L4">...</a></span>
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<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0L75">75</a></span>
<span class="diff-line-number-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0L76">76</a></span>
<span class="diff-line-number-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0L77">77</a></span>
<span class="diff-line-number-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0L78">78</a></span>
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<span class="diff-line-number-nothing" style="display: block; white-space: pre">&nbsp;</span>
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<span class="diff-line-number-nothing" style="display: block; white-space: pre">&nbsp;</span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0L79">79</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0L80">80</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0L81">81</a></span>
</pre>
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<pre style="border: 0; font-family: Consolas, Menlo, &quot;Liberation Mono&quot;, Courier, monospace; line-height: 1.2; margin: 0; padding: 0.5em; white-space: normal; width: auto"><span class="diff-line-number-hunk-header" style="display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R4">...</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R5">5</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R6">6</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R7">7</a></span>
<span class="diff-line-number-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R8">8</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R9">9</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R10">10</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R11">11</a></span>
<span class="diff-line-number-hunk-header" style="display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R15">...</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R16">16</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R17">17</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R18">18</a></span>
<span class="diff-line-number-nothing" style="display: block; white-space: pre">&nbsp;</span>
<span class="diff-line-number-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R19">19</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R20">20</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R21">21</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R22">22</a></span>
<span class="diff-line-number-nothing" style="display: block; white-space: pre">&nbsp;</span>
<span class="diff-line-number-nothing" style="display: block; white-space: pre">&nbsp;</span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R23">23</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R24">24</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R25">25</a></span>
<span class="diff-line-number-nothing" style="display: block; white-space: pre">&nbsp;</span>
<span class="diff-line-number-nothing" style="display: block; white-space: pre">&nbsp;</span>
<span class="diff-line-number-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R26">26</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R27">27</a></span>
<span class="diff-line-number-nothing" style="display: block; white-space: pre">&nbsp;</span>
<span class="diff-line-number-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R28">28</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R29">29</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R30">30</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R31">31</a></span>
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<span class="diff-line-number-nothing" style="display: block; white-space: pre">&nbsp;</span>
<span class="diff-line-number-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R32">32</a></span>
<span class="diff-line-number-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R33">33</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R34">34</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R35">35</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R36">36</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R37">37</a></span>
<span class="diff-line-number-nothing" style="display: block; white-space: pre">&nbsp;</span>
<span class="diff-line-number-nothing" style="display: block; white-space: pre">&nbsp;</span>
<span class="diff-line-number-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R38">38</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R39">39</a></span>
<span class="diff-line-number-nothing" style="display: block; white-space: pre">&nbsp;</span>
<span class="diff-line-number-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R40">40</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R41">41</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R42">42</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R43">43</a></span>
<span class="diff-line-number-nothing" style="display: block; white-space: pre">&nbsp;</span>
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<span class="diff-line-number-nothing" style="display: block; white-space: pre">&nbsp;</span>
<span class="diff-line-number-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R44">44</a></span>
<span class="diff-line-number-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R45">45</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R46">46</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R47">47</a></span>
<span class="diff-line-number-nothing" style="display: block; white-space: pre">&nbsp;</span>
<span class="diff-line-number-nothing" style="display: block; white-space: pre">&nbsp;</span>
<span class="diff-line-number-nothing" style="display: block; white-space: pre">&nbsp;</span>
<span class="diff-line-number-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R48">48</a></span>
<span class="diff-line-number-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R49">49</a></span>
<span class="diff-line-number-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R50">50</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R51">51</a></span>
<span class="diff-line-number-nothing" style="display: block; white-space: pre">&nbsp;</span>
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<span class="diff-line-number-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R52">52</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R53">53</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R54">54</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R55">55</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R56">56</a></span>
<span class="diff-line-number-nothing" style="display: block; white-space: pre">&nbsp;</span>
<span class="diff-line-number-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R57">57</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R58">58</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R59">59</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R60">60</a></span>
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<span class="diff-line-number-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R61">61</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R62">62</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R63">63</a></span>
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<span class="diff-line-number-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R64">64</a></span>
<span class="diff-line-number-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R65">65</a></span>
<span class="diff-line-number-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R66">66</a></span>
<span class="diff-line-number-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R67">67</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R68">68</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R69">69</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/8254a1d107547bc47eeb64a276f7cb6412a553de#L0R70">70</a></span>
</pre>
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<pre style="border: 0; font-family: Consolas, Menlo, &quot;Liberation Mono&quot;, Courier, monospace; line-height: 1.2; margin: 0; padding: 0.5em; white-space: normal; width: auto"><span class="diff-hunk-header" style="background-color: #eaf2f5; color: #999999; display: block; white-space: pre">@@ -5,6 +5,7 @@</span>
<span class="diff-not-changed" style="display: block; white-space: pre"> </span>
<span class="diff-not-changed" style="display: block; white-space: pre"> namespace grnxx {</span>
<span class="diff-not-changed" style="display: block; white-space: pre"> </span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+// 後置記法(逆ポーランド記法)に基づいて式のオブジェクトを構築する.</span>
<span class="diff-not-changed" style="display: block; white-space: pre"> class ExpressionBuilder {</span>
<span class="diff-not-changed" style="display: block; white-space: pre">  public:</span>
<span class="diff-not-changed" style="display: block; white-space: pre">   ExpressionBuilder();</span>
<span class="diff-hunk-header" style="background-color: #eaf2f5; color: #999999; display: block; white-space: pre">@@ -15,67 +16,55 @@ <span class="diff-context" style="background-color: #ffffaa; color: #000000">class ExpressionBuilder {</span></span>
<span class="diff-not-changed" style="display: block; white-space: pre">   // 評価結果の型を取得する.</span>
<span class="diff-not-changed" style="display: block; white-space: pre">   virtual DataType data_type() const = 0;</span>
<span class="diff-not-changed" style="display: block; white-space: pre"> </span>
<span class="diff-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre">-  // 定数に対応するノードを作成する.</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+  // 定数をスタックに積む.</span>
<span class="diff-not-changed" style="display: block; white-space: pre">   // 成功すれば true を返す.</span>
<span class="diff-not-changed" style="display: block; white-space: pre">   // 失敗したときは *error にその内容を格納し, false を返す.</span>
<span class="diff-not-changed" style="display: block; white-space: pre">   //</span>
<span class="diff-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre">-  // 作成されたノードはスタックに積まれる.</span>
<span class="diff-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre">-  //</span>
<span class="diff-not-changed" style="display: block; white-space: pre">   // 失敗する状況としては,以下のようなものが挙げられる.</span>
<span class="diff-not-changed" style="display: block; white-space: pre">   // - 指定された定数が不正である.</span>
<span class="diff-not-changed" style="display: block; white-space: pre">   // - リソースを確保できない.</span>
<span class="diff-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre">-  virtual bool create_datum_node(Error *error,</span>
<span class="diff-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre">-                                 const Datum &amp;datum) = 0;</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+  virtual bool push_datum(Error *error, const Datum &amp;datum) = 0;</span>
<span class="diff-not-changed" style="display: block; white-space: pre"> </span>
<span class="diff-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre">-  // カラムに対応するノードを作成する.</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+  // カラムをスタックに積む.</span>
<span class="diff-not-changed" style="display: block; white-space: pre">   // 成功すれば true を返す.</span>
<span class="diff-not-changed" style="display: block; white-space: pre">   // 失敗したときは *error にその内容を格納し, false を返す.</span>
<span class="diff-not-changed" style="display: block; white-space: pre">   //</span>
<span class="diff-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre">-  // column_name に &quot;_id&quot; を指定すれば行 ID に対応するノード,</span>
<span class="diff-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre">-  // &quot;_score&quot; を指定すればスコアに対応するノードを作成する.</span>
<span class="diff-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre">-  //</span>
<span class="diff-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre">-  // 作成されたノードはスタックに積まれる.</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+  // column_name に &quot;_id&quot; を指定すれば行 ID に対応する擬似カラム,</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+  // &quot;_score&quot; を指定すればスコアに対応する擬似カラムをスタックに積む.</span>
<span class="diff-not-changed" style="display: block; white-space: pre">   //</span>
<span class="diff-not-changed" style="display: block; white-space: pre">   // 失敗する状況としては,以下のようなものが挙げられる.</span>
<span class="diff-not-changed" style="display: block; white-space: pre">   // - 指定されたカラムが存在しない.</span>
<span class="diff-not-changed" style="display: block; white-space: pre">   // - リソースを確保できない.</span>
<span class="diff-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre">-  virtual bool create_column_node(Error *error,</span>
<span class="diff-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre">-                                  const char *column_name) = 0;</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+  virtual bool push_column(Error *error, const char *column_name) = 0;</span>
<span class="diff-not-changed" style="display: block; white-space: pre"> </span>
<span class="diff-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre">-  // 演算子に対応するノードを作成する.</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+  // 演算子に対応する被演算子をスタックから降ろし,演算子をスタックに積む.</span>
<span class="diff-not-changed" style="display: block; white-space: pre">   // 成功すれば true を返す.</span>
<span class="diff-not-changed" style="display: block; white-space: pre">   // 失敗したときは *error にその内容を格納し, false を返す.</span>
<span class="diff-not-changed" style="display: block; white-space: pre">   //</span>
<span class="diff-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre">-  // スタックに積まれているノードを降ろして被演算子とするため,</span>
<span class="diff-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre">-  // 被演算子を作成した後に演算子を作成しなければならない.</span>
<span class="diff-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre">-  // これは後置式(逆ポーランド記法)の考え方にもとづく.</span>
<span class="diff-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre">-  //</span>
<span class="diff-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre">-  // 作成されたノードはスタックに積まれる.</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+  // 被演算子はあらかじめスタックに積んでおく必要があり,</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+  // 被演算子の型や数に問題があるときは失敗する.</span>
<span class="diff-not-changed" style="display: block; white-space: pre">   //</span>
<span class="diff-not-changed" style="display: block; white-space: pre">   // 失敗する状況としては,以下のようなものが挙げられる.</span>
<span class="diff-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre">-  // - 引数がスタックに存在しない.</span>
<span class="diff-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre">-  // - 演算子と引数が対応していない.</span>
<span class="diff-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre">-  //  - 演算子が求める引数の型と実際の引数の型が異なる.</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+  // - 演算子と被演算子が対応していない.</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+  //  - 被演算子がスタックに存在しない.</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+  //  - 演算子が求める引数の型と被演算子の型が異なる.</span>
<span class="diff-not-changed" style="display: block; white-space: pre">   // - リソースを確保できない.</span>
<span class="diff-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre">-  virtual bool create_operator_node(</span>
<span class="diff-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre">-      Error *error,</span>
<span class="diff-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre">-      OperatorType operator_type) = 0;</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+  virtual bool push_operator(Error *error, OperatorType operator_type) = 0;</span>
<span class="diff-not-changed" style="display: block; white-space: pre"> </span>
<span class="diff-not-changed" style="display: block; white-space: pre">   // 保持しているノードやスタックを破棄する.</span>
<span class="diff-not-changed" style="display: block; white-space: pre">   virtual void clear();</span>
<span class="diff-not-changed" style="display: block; white-space: pre"> </span>
<span class="diff-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre">-  // 構築された式を取得する.</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+  // 構築中の式を完成させ,その所有権を取得する.</span>
<span class="diff-not-changed" style="display: block; white-space: pre">   // 成功すれば有効なオブジェクトへのポインタを返す.</span>
<span class="diff-not-changed" style="display: block; white-space: pre">   // 失敗したときは *error にその内容を格納し, nullptr を返す.</span>
<span class="diff-not-changed" style="display: block; white-space: pre">   //</span>
<span class="diff-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre">-  // 保持しているノードやスタックは破棄される.</span>
<span class="diff-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre">-  //</span>
<span class="diff-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre">-  // TODO: 内部で作成した Expression の所有権を返すだけにしたい.</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+  // 所有権を返すため,保持しているノードやスタックは破棄する.</span>
<span class="diff-not-changed" style="display: block; white-space: pre">   //</span>
<span class="diff-not-changed" style="display: block; white-space: pre">   // 失敗する状況としては,以下のようなものが挙げられる.</span>
<span class="diff-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre">-  // - ノードがひとつもない.</span>
<span class="diff-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre">-  // - スタックに二つ以上のノードが存在する.</span>
<span class="diff-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre">-  //  - 式が完成していないことを示す.</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+  // - スタックの要素数が一つでない.</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+  //  - 何も積まれていない.</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+  //  - 積まれたものが使われずに残っている.</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+  //   - 式が完成していないことを示す.</span>
<span class="diff-not-changed" style="display: block; white-space: pre">   // - リソースを確保できない.</span>
<span class="diff-not-changed" style="display: block; white-space: pre">   virtual std::unique_ptr&lt;Expression&gt; release(Error *error);</span>
<span class="diff-not-changed" style="display: block; white-space: pre"> };</span>
</pre>
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