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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">2014-06-12 16:09:01 +0900 (Thu, 12 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/d1630e1936cd05159373509a2d43a70bfae0e53a">d1630e1936cd05159373509a2d43a70bfae0e53a</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">Add ExpressionBuilder::release() instead of create_expression().</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/d1630e1936cd05159373509a2d43a70bfae0e53a#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 (+15 -5)</span>
<span class="diff-header-mark" style="background-color: #eaf2f5; color: #999999; display: block; white-space: pre">===================================================================</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/d1630e1936cd05159373509a2d43a70bfae0e53a#L0R76">76</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/d1630e1936cd05159373509a2d43a70bfae0e53a#L0R77">77</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/d1630e1936cd05159373509a2d43a70bfae0e53a#L0R78">78</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/d1630e1936cd05159373509a2d43a70bfae0e53a#L0R79">79</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-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/d1630e1936cd05159373509a2d43a70bfae0e53a#L0R80">80</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/d1630e1936cd05159373509a2d43a70bfae0e53a#L0R81">81</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/d1630e1936cd05159373509a2d43a70bfae0e53a#L0R82">82</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/groonga/grnxx/commit/d1630e1936cd05159373509a2d43a70bfae0e53a#L0R83">83</a></span>
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            <td class="diff-content" style="border: 1px solid #aaa">
<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">@@ -31,6 +31,9 @@ <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">   // 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-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 に対応するノード,</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ノードを作成する.</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+  //</span>
<span class="diff-not-changed" style="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-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-hunk-header" style="background-color: #eaf2f5; color: #999999; display: block; white-space: pre">@@ -47,6 +50,8 @@ <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">   // 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-not-changed" style="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-not-changed" style="display: block; white-space: pre">   //</span>
<span class="diff-added" style="background-color: #aaffaa; 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">+  //</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">   // - 引数がスタックに存在しない.</span>
<span class="diff-not-changed" style="display: block; white-space: pre">   // - 演算子と引数が対応していない.</span>
<span class="diff-hunk-header" style="background-color: #eaf2f5; color: #999999; display: block; white-space: pre">@@ -56,18 +61,23 @@ <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">       Error *error,</span>
<span class="diff-not-changed" style="display: block; white-space: pre">       OperatorType operator_type) = 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">-  // すべてのノードを破棄する.</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; 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">-  // 最後に作成したノードを根とする構文木に対応する式を作成する.</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+  // 構築された式を取得する.</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-added" style="background-color: #aaffaa; 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-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+  //</span>
<span class="diff-added" style="background-color: #aaffaa; 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">+  //</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-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+  // - ノードがひとつもない.</span>
<span class="diff-added" style="background-color: #aaffaa; 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-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-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre">-  virtual std::unique_ptr&lt;Expression&gt; create_expression(</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">-      const ExpressionOptions &amp;options) const;</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; 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>
<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>
</pre>
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