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<li class="navelem"><a class="el" href="dir_a62226f9e3a6c7c5a3be455e2f87ae01.html">xrpld</a></li><li class="navelem"><a class="el" href="dir_c69db3203fa08a9ff994909ba6ee9783.html">app</a></li><li class="navelem"><a class="el" href="dir_4b2d6f306dc33741b6f38a59a670a446.html">tx</a></li><li class="navelem"><a class="el" href="dir_7b1ffcd2aae1e871efc2e94c72e78699.html">detail</a></li> </ul>
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<div class="headertitle"><div class="title">BookTip.cpp</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="preprocessor">#include &lt;xrpld/app/tx/detail/BookTip.h&gt;</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno"> 2</span> </div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno"> 3</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespacexrpl.html">xrpl</a> {</div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno"> 4</span> </div>
<div class="foldopen" id="foldopen00005" data-start="{" data-end="}">
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno"><a class="line" href="classxrpl_1_1BookTip.html#a378ad6f7f42956c6569b1826c43ace71"> 5</a></span><a class="code hl_function" href="classxrpl_1_1BookTip.html#a378ad6f7f42956c6569b1826c43ace71">BookTip::BookTip</a>(<a class="code hl_class" href="classxrpl_1_1ApplyView.html">ApplyView</a>&amp; view, <a class="code hl_class" href="classxrpl_1_1Book.html">Book</a> <span class="keyword">const</span>&amp; book)</div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno"> 6</span> : view_(view), m_valid(false), m_book(<a class="code hl_function" href="namespacexrpl.html#ab210d90a050229ac2046e883b3888d5d">getBookBase</a>(book)), m_end(<a class="code hl_function" href="namespacexrpl.html#a9a1425212673348937444a4a5ad99bab">getQualityNext</a>(m_book))</div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno"> 7</span>{</div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno"> 8</span>}</div>
</div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno"> 9</span> </div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno"> 10</span><span class="keywordtype">bool</span></div>
<div class="foldopen" id="foldopen00011" data-start="{" data-end="}">
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno"><a class="line" href="classxrpl_1_1BookTip.html#a44900c485ac96283e913d8b74afdaca9"> 11</a></span><a class="code hl_function" href="classxrpl_1_1BookTip.html#a44900c485ac96283e913d8b74afdaca9">BookTip::step</a>(<a class="code hl_class" href="classbeast_1_1Journal.html">beast::Journal</a> j)</div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno"> 12</span>{</div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno"> 13</span> <span class="keywordflow">if</span> (<a class="code hl_variable" href="classxrpl_1_1BookTip.html#aad01577364a5ad905df82b565ded610d">m_valid</a>)</div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno"> 14</span> {</div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno"> 15</span> <span class="keywordflow">if</span> (<a class="code hl_variable" href="classxrpl_1_1BookTip.html#a75199776f7dfd47439f512cfd5e34495">m_entry</a>)</div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno"> 16</span> {</div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno"> 17</span> <a class="code hl_function" href="namespacexrpl.html#ab88e8fe757698a31c8cee668308bd916">offerDelete</a>(<a class="code hl_variable" href="classxrpl_1_1BookTip.html#a58e8b02376ceb527056563b3d6b56671">view_</a>, <a class="code hl_variable" href="classxrpl_1_1BookTip.html#a75199776f7dfd47439f512cfd5e34495">m_entry</a>, j);</div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno"> 18</span> <a class="code hl_variable" href="classxrpl_1_1BookTip.html#a75199776f7dfd47439f512cfd5e34495">m_entry</a> = <span class="keyword">nullptr</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> }</div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</span> </div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno"> 22</span> <span class="keywordflow">for</span> (;;)</div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno"> 23</span> {</div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno"> 24</span> <span class="comment">// See if there&#39;s an entry at or worse than current quality. Notice</span></div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno"> 25</span> <span class="comment">// that the quality is encoded only in the index of the first page</span></div>
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno"> 26</span> <span class="comment">// of a directory.</span></div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno"> 27</span> <span class="keyword">auto</span> <span class="keyword">const</span> first_page = <a class="code hl_variable" href="classxrpl_1_1BookTip.html#a58e8b02376ceb527056563b3d6b56671">view_</a>.<a class="code hl_function" href="classxrpl_1_1ReadView.html#acdb1bbc006dc50ae95d5d5925a2b76ce">succ</a>(<a class="code hl_variable" href="classxrpl_1_1BookTip.html#ac67b0631cb37c7fbe9eb371f922ff74f">m_book</a>, <a class="code hl_variable" href="classxrpl_1_1BookTip.html#afa931e2e4ff3754a2039169fd32ee6b4">m_end</a>);</div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno"> 28</span> </div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno"> 29</span> <span class="keywordflow">if</span> (!first_page)</div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span> <span class="keywordflow">return</span> <span class="keyword">false</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="keywordtype">unsigned</span> <span class="keywordtype">int</span> di = 0;</div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/memory/shared_ptr.html">std::shared_ptr&lt;SLE&gt;</a> <a class="code hl_function" href="classxrpl_1_1BookTip.html#a66bdd6a53b0889acdbe69580405fdfe1">dir</a>;</div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno"> 34</span> </div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno"> 35</span> <span class="keywordflow">if</span> (<a class="code hl_function" href="namespacexrpl.html#a181f1df8ff202fa0ffd2b384cc1840f1">dirFirst</a>(<a class="code hl_variable" href="classxrpl_1_1BookTip.html#a58e8b02376ceb527056563b3d6b56671">view_</a>, *first_page, <a class="code hl_function" href="classxrpl_1_1BookTip.html#a66bdd6a53b0889acdbe69580405fdfe1">dir</a>, di, <a class="code hl_variable" href="classxrpl_1_1BookTip.html#a66fc38082f6dc2919757dc231310a094">m_index</a>))</div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span> {</div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span> <a class="code hl_variable" href="classxrpl_1_1BookTip.html#a42951d81de662e647ed91960a81d079b">m_dir</a> = <a class="code hl_function" href="classxrpl_1_1BookTip.html#a66bdd6a53b0889acdbe69580405fdfe1">dir</a>-&gt;key();</div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span> <a class="code hl_variable" href="classxrpl_1_1BookTip.html#a75199776f7dfd47439f512cfd5e34495">m_entry</a> = <a class="code hl_variable" href="classxrpl_1_1BookTip.html#a58e8b02376ceb527056563b3d6b56671">view_</a>.<a class="code hl_function" href="classxrpl_1_1ApplyView.html#ae08e50d8506bc2beafd62ade8087285a">peek</a>(<a class="code hl_function" href="namespacexrpl_1_1keylet.html#a8c47d57d12c3ebaf79976f6f73671092">keylet::offer</a>(<a class="code hl_variable" href="classxrpl_1_1BookTip.html#a66fc38082f6dc2919757dc231310a094">m_index</a>));</div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span> <a class="code hl_variable" href="classxrpl_1_1BookTip.html#ac872fa584c36af3ddccb6afbc47ab661">m_quality</a> = Quality(<a class="code hl_function" href="namespacexrpl.html#a49ec4aa8a1752d20b15e31876c541fc0">getQuality</a>(*first_page));</div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno"> 40</span> <a class="code hl_variable" href="classxrpl_1_1BookTip.html#aad01577364a5ad905df82b565ded610d">m_valid</a> = <span class="keyword">true</span>;</div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span> </div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"> 42</span> <span class="comment">// Next query should start before this directory</span></div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span> <a class="code hl_variable" href="classxrpl_1_1BookTip.html#ac67b0631cb37c7fbe9eb371f922ff74f">m_book</a> = *first_page;</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> <span class="comment">// The quality immediately before the next quality</span></div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span> --<a class="code hl_variable" href="classxrpl_1_1BookTip.html#ac67b0631cb37c7fbe9eb371f922ff74f">m_book</a>;</div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span> </div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span> <span class="keywordflow">break</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> </div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span> <span class="comment">// There should never be an empty directory but just in case,</span></div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span> <span class="comment">// we handle that case by advancing to the next directory.</span></div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"> 53</span> <a class="code hl_variable" href="classxrpl_1_1BookTip.html#ac67b0631cb37c7fbe9eb371f922ff74f">m_book</a> = *first_page;</div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno"> 54</span> }</div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno"> 55</span> </div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno"> 56</span> <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno"> 57</span>}</div>
</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>} <span class="comment">// namespace xrpl</span></div>
<div class="ttc" id="aclassbeast_1_1Journal_html"><div class="ttname"><a href="classbeast_1_1Journal.html">beast::Journal</a></div><div class="ttdoc">A generic endpoint for log messages.</div><div class="ttdef"><b>Definition</b> <a href="Journal_8h_source.html#l00040">Journal.h:41</a></div></div>
<div class="ttc" id="aclassxrpl_1_1ApplyView_html"><div class="ttname"><a href="classxrpl_1_1ApplyView.html">xrpl::ApplyView</a></div><div class="ttdoc">Writeable view to a ledger, for applying a transaction.</div><div class="ttdef"><b>Definition</b> <a href="ApplyView_8h_source.html#l00114">ApplyView.h:115</a></div></div>
<div class="ttc" id="aclassxrpl_1_1ApplyView_html_ae08e50d8506bc2beafd62ade8087285a"><div class="ttname"><a href="classxrpl_1_1ApplyView.html#ae08e50d8506bc2beafd62ade8087285a">xrpl::ApplyView::peek</a></div><div class="ttdeci">virtual std::shared_ptr&lt; SLE &gt; peek(Keylet const &amp;k)=0</div><div class="ttdoc">Prepare to modify the SLE associated with key.</div></div>
<div class="ttc" id="aclassxrpl_1_1BookTip_html_a378ad6f7f42956c6569b1826c43ace71"><div class="ttname"><a href="classxrpl_1_1BookTip.html#a378ad6f7f42956c6569b1826c43ace71">xrpl::BookTip::BookTip</a></div><div class="ttdeci">BookTip(ApplyView &amp;view, Book const &amp;book)</div><div class="ttdoc">Create the iterator.</div><div class="ttdef"><b>Definition</b> <a href="BookTip_8cpp_source.html#l00005">BookTip.cpp:5</a></div></div>
<div class="ttc" id="aclassxrpl_1_1BookTip_html_a42951d81de662e647ed91960a81d079b"><div class="ttname"><a href="classxrpl_1_1BookTip.html#a42951d81de662e647ed91960a81d079b">xrpl::BookTip::m_dir</a></div><div class="ttdeci">uint256 m_dir</div><div class="ttdef"><b>Definition</b> <a href="BookTip_8h_source.html#l00023">BookTip.h:23</a></div></div>
<div class="ttc" id="aclassxrpl_1_1BookTip_html_a44900c485ac96283e913d8b74afdaca9"><div class="ttname"><a href="classxrpl_1_1BookTip.html#a44900c485ac96283e913d8b74afdaca9">xrpl::BookTip::step</a></div><div class="ttdeci">bool step(beast::Journal j)</div><div class="ttdoc">Erases the current offer and advance to the next offer.</div><div class="ttdef"><b>Definition</b> <a href="BookTip_8cpp_source.html#l00011">BookTip.cpp:11</a></div></div>
<div class="ttc" id="aclassxrpl_1_1BookTip_html_a58e8b02376ceb527056563b3d6b56671"><div class="ttname"><a href="classxrpl_1_1BookTip.html#a58e8b02376ceb527056563b3d6b56671">xrpl::BookTip::view_</a></div><div class="ttdeci">ApplyView &amp; view_</div><div class="ttdef"><b>Definition</b> <a href="BookTip_8h_source.html#l00019">BookTip.h:19</a></div></div>
<div class="ttc" id="aclassxrpl_1_1BookTip_html_a66bdd6a53b0889acdbe69580405fdfe1"><div class="ttname"><a href="classxrpl_1_1BookTip.html#a66bdd6a53b0889acdbe69580405fdfe1">xrpl::BookTip::dir</a></div><div class="ttdeci">uint256 const &amp; dir() const noexcept</div><div class="ttdef"><b>Definition</b> <a href="BookTip_8h_source.html#l00033">BookTip.h:33</a></div></div>
<div class="ttc" id="aclassxrpl_1_1BookTip_html_a66fc38082f6dc2919757dc231310a094"><div class="ttname"><a href="classxrpl_1_1BookTip.html#a66fc38082f6dc2919757dc231310a094">xrpl::BookTip::m_index</a></div><div class="ttdeci">uint256 m_index</div><div class="ttdef"><b>Definition</b> <a href="BookTip_8h_source.html#l00024">BookTip.h:24</a></div></div>
<div class="ttc" id="aclassxrpl_1_1BookTip_html_a75199776f7dfd47439f512cfd5e34495"><div class="ttname"><a href="classxrpl_1_1BookTip.html#a75199776f7dfd47439f512cfd5e34495">xrpl::BookTip::m_entry</a></div><div class="ttdeci">std::shared_ptr&lt; SLE &gt; m_entry</div><div class="ttdef"><b>Definition</b> <a href="BookTip_8h_source.html#l00025">BookTip.h:25</a></div></div>
<div class="ttc" id="aclassxrpl_1_1BookTip_html_aad01577364a5ad905df82b565ded610d"><div class="ttname"><a href="classxrpl_1_1BookTip.html#aad01577364a5ad905df82b565ded610d">xrpl::BookTip::m_valid</a></div><div class="ttdeci">bool m_valid</div><div class="ttdef"><b>Definition</b> <a href="BookTip_8h_source.html#l00020">BookTip.h:20</a></div></div>
<div class="ttc" id="aclassxrpl_1_1BookTip_html_ac67b0631cb37c7fbe9eb371f922ff74f"><div class="ttname"><a href="classxrpl_1_1BookTip.html#ac67b0631cb37c7fbe9eb371f922ff74f">xrpl::BookTip::m_book</a></div><div class="ttdeci">uint256 m_book</div><div class="ttdef"><b>Definition</b> <a href="BookTip_8h_source.html#l00021">BookTip.h:21</a></div></div>
<div class="ttc" id="aclassxrpl_1_1BookTip_html_ac872fa584c36af3ddccb6afbc47ab661"><div class="ttname"><a href="classxrpl_1_1BookTip.html#ac872fa584c36af3ddccb6afbc47ab661">xrpl::BookTip::m_quality</a></div><div class="ttdeci">Quality m_quality</div><div class="ttdef"><b>Definition</b> <a href="BookTip_8h_source.html#l00026">BookTip.h:26</a></div></div>
<div class="ttc" id="aclassxrpl_1_1BookTip_html_afa931e2e4ff3754a2039169fd32ee6b4"><div class="ttname"><a href="classxrpl_1_1BookTip.html#afa931e2e4ff3754a2039169fd32ee6b4">xrpl::BookTip::m_end</a></div><div class="ttdeci">uint256 m_end</div><div class="ttdef"><b>Definition</b> <a href="BookTip_8h_source.html#l00022">BookTip.h:22</a></div></div>
<div class="ttc" id="aclassxrpl_1_1Book_html"><div class="ttname"><a href="classxrpl_1_1Book.html">xrpl::Book</a></div><div class="ttdoc">Specifies an order book.</div><div class="ttdef"><b>Definition</b> <a href="Book_8h_source.html#l00016">Book.h:17</a></div></div>
<div class="ttc" id="aclassxrpl_1_1ReadView_html_acdb1bbc006dc50ae95d5d5925a2b76ce"><div class="ttname"><a href="classxrpl_1_1ReadView.html#acdb1bbc006dc50ae95d5d5925a2b76ce">xrpl::ReadView::succ</a></div><div class="ttdeci">virtual std::optional&lt; key_type &gt; succ(key_type const &amp;key, std::optional&lt; key_type &gt; const &amp;last=std::nullopt) const =0</div><div class="ttdoc">Return the key of the next state item.</div></div>
<div class="ttc" id="anamespacexrpl_1_1keylet_html_a8c47d57d12c3ebaf79976f6f73671092"><div class="ttname"><a href="namespacexrpl_1_1keylet.html#a8c47d57d12c3ebaf79976f6f73671092">xrpl::keylet::offer</a></div><div class="ttdeci">Keylet offer(AccountID const &amp;id, std::uint32_t seq) noexcept</div><div class="ttdoc">An offer from an account.</div><div class="ttdef"><b>Definition</b> <a href="Indexes_8cpp_source.html#l00235">Indexes.cpp:235</a></div></div>
<div class="ttc" id="anamespacexrpl_html"><div class="ttname"><a href="namespacexrpl.html">xrpl</a></div><div class="ttdoc">Use hash_* containers for keys that do not need a cryptographically secure hashing algorithm.</div><div class="ttdef"><b>Definition</b> <a href="algorithm_8h_source.html#l00006">algorithm.h:6</a></div></div>
<div class="ttc" id="anamespacexrpl_html_a181f1df8ff202fa0ffd2b384cc1840f1"><div class="ttname"><a href="namespacexrpl.html#a181f1df8ff202fa0ffd2b384cc1840f1">xrpl::dirFirst</a></div><div class="ttdeci">bool dirFirst(ApplyView &amp;view, uint256 const &amp;root, std::shared_ptr&lt; SLE &gt; &amp;page, unsigned int &amp;index, uint256 &amp;entry)</div><div class="ttdef"><b>Definition</b> <a href="View_8cpp_source.html#l00089">View.cpp:89</a></div></div>
<div class="ttc" id="anamespacexrpl_html_a49ec4aa8a1752d20b15e31876c541fc0"><div class="ttname"><a href="namespacexrpl.html#a49ec4aa8a1752d20b15e31876c541fc0">xrpl::getQuality</a></div><div class="ttdeci">std::uint64_t getQuality(uint256 const &amp;uBase)</div><div class="ttdef"><b>Definition</b> <a href="Indexes_8cpp_source.html#l00126">Indexes.cpp:126</a></div></div>
<div class="ttc" id="anamespacexrpl_html_a9a1425212673348937444a4a5ad99bab"><div class="ttname"><a href="namespacexrpl.html#a9a1425212673348937444a4a5ad99bab">xrpl::getQualityNext</a></div><div class="ttdeci">uint256 getQualityNext(uint256 const &amp;uBase)</div><div class="ttdef"><b>Definition</b> <a href="Indexes_8cpp_source.html#l00119">Indexes.cpp:119</a></div></div>
<div class="ttc" id="anamespacexrpl_html_ab210d90a050229ac2046e883b3888d5d"><div class="ttname"><a href="namespacexrpl.html#ab210d90a050229ac2046e883b3888d5d">xrpl::getBookBase</a></div><div class="ttdeci">uint256 getBookBase(Book const &amp;book)</div><div class="ttdef"><b>Definition</b> <a href="Indexes_8cpp_source.html#l00098">Indexes.cpp:98</a></div></div>
<div class="ttc" id="anamespacexrpl_html_ab88e8fe757698a31c8cee668308bd916"><div class="ttname"><a href="namespacexrpl.html#ab88e8fe757698a31c8cee668308bd916">xrpl::offerDelete</a></div><div class="ttdeci">TER offerDelete(ApplyView &amp;view, std::shared_ptr&lt; SLE &gt; const &amp;sle, beast::Journal j)</div><div class="ttdoc">Delete an offer.</div><div class="ttdef"><b>Definition</b> <a href="View_8cpp_source.html#l01672">View.cpp:1672</a></div></div>
<div class="ttc" id="ashared_ptr_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/memory/shared_ptr.html">std::shared_ptr</a></div></div>
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