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<para>constructs an empty task </para>
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</parameternamelist>
<parameterdescription>
<para>one or multiple tasks</para>
</parameterdescription>
</parameteritem>
</parameterlist>
<simplesect kind="return"><para><computeroutput>*this</computeroutput> </para>
</simplesect>
</para>
        </detaileddescription>
        <inbodydescription>
        </inbodydescription>
        <location file="/Users/twhuang/Code/taskflow/taskflow/core/task.hpp" line="268" column="10" bodyfile="/Users/twhuang/Code/taskflow/taskflow/core/task.hpp" bodystart="405" bodyend="409"/>
      </memberdef>
      <memberdef kind="function" id="classtf_1_1Task_1a26709523eb112f2d024f4c0e9d2f0019" prot="public" static="no" const="no" explicit="no" inline="yes" virt="non-virtual">
        <type><ref refid="classtf_1_1Task" kindref="compound">Task</ref> &amp;</type>
        <definition>Task &amp; tf::Task::release</definition>
        <argsstring>(Semaphore &amp;semaphore)</argsstring>
        <name>release</name>
        <qualifiedname>tf::Task::release</qualifiedname>
        <param>
          <type><ref refid="classtf_1_1Semaphore" kindref="compound">Semaphore</ref> &amp;</type>
          <declname>semaphore</declname>
        </param>
        <briefdescription>
<para>makes the task release this semaphore </para>
        </briefdescription>
        <detaileddescription>
        </detaileddescription>
        <inbodydescription>
        </inbodydescription>
        <location file="/Users/twhuang/Code/taskflow/taskflow/core/task.hpp" line="273" column="10" bodyfile="/Users/twhuang/Code/taskflow/taskflow/core/task.hpp" bodystart="456" bodyend="463"/>
      </memberdef>
      <memberdef kind="function" id="classtf_1_1Task_1a076ab9c6f3a0346e16cfb5fee7dc4ce8" prot="public" static="no" const="no" explicit="no" inline="yes" virt="non-virtual">
        <type><ref refid="classtf_1_1Task" kindref="compound">Task</ref> &amp;</type>
        <definition>Task &amp; tf::Task::acquire</definition>
        <argsstring>(Semaphore &amp;semaphore)</argsstring>
        <name>acquire</name>
        <qualifiedname>tf::Task::acquire</qualifiedname>
        <param>
          <type><ref refid="classtf_1_1Semaphore" kindref="compound">Semaphore</ref> &amp;</type>
          <declname>semaphore</declname>
        </param>
        <briefdescription>
<para>makes the task acquire this semaphore </para>
        </briefdescription>
        <detaileddescription>
        </detaileddescription>
        <inbodydescription>
        </inbodydescription>
        <location file="/Users/twhuang/Code/taskflow/taskflow/core/task.hpp" line="278" column="10" bodyfile="/Users/twhuang/Code/taskflow/taskflow/core/task.hpp" bodystart="447" bodyend="453"/>
      </memberdef>
      <memberdef kind="function" id="classtf_1_1Task_1afd82ab6d6518d1142a72c4d2c97ff114" prot="public" static="no" const="no" explicit="no" inline="yes" virt="non-virtual">
        <type><ref refid="classtf_1_1Task" kindref="compound">Task</ref> &amp;</type>
        <definition>Task &amp; tf::Task::data</definition>
        <argsstring>(void *data)</argsstring>
        <name>data</name>
        <qualifiedname>tf::Task::data</qualifiedname>
        <param>
          <type>void *</type>
          <declname>data</declname>
        </param>
        <briefdescription>
<para>assigns pointer to user data </para>
        </briefdescription>
        <detaileddescription>
<para><parameterlist kind="param"><parameteritem>
<parameternamelist>
<parametername>data</parametername>
</parameternamelist>
<parameterdescription>
<para>pointer to user data</para>
</parameterdescription>
</parameteritem>
</parameterlist>
The following example shows how to attach user data to a task and run the task iteratively while changing the data value:</para>
<para><programlisting filename=".cpp"><codeline><highlight class="normal"><ref refid="classtf_1_1Executor" kindref="compound">tf::Executor</ref><sp/>executor;</highlight></codeline>
<codeline><highlight class="normal"><ref refid="classtf_1_1Taskflow" kindref="compound">tf::Taskflow</ref><sp/>taskflow(</highlight><highlight class="stringliteral">&quot;attach<sp/>data<sp/>to<sp/>a<sp/>task&quot;</highlight><highlight class="normal">);</highlight></codeline>
<codeline><highlight class="normal"></highlight></codeline>
<codeline><highlight class="normal"></highlight><highlight class="keywordtype">int</highlight><highlight class="normal"><sp/><ref refid="classtf_1_1Task_1a320827cb70295a6fe2cc37691405409c" kindref="member">data</ref>;</highlight></codeline>
<codeline><highlight class="normal"></highlight></codeline>
<codeline><highlight class="normal"></highlight><highlight class="comment">//<sp/>create<sp/>a<sp/>task<sp/>and<sp/>attach<sp/>it<sp/>the<sp/>data</highlight><highlight class="normal"></highlight></codeline>
<codeline><highlight class="normal"></highlight><highlight class="keyword">auto</highlight><highlight class="normal"><sp/>A<sp/>=<sp/>taskflow.placeholder();</highlight></codeline>
<codeline><highlight class="normal">A.data(&amp;<ref refid="classtf_1_1Task_1a320827cb70295a6fe2cc37691405409c" kindref="member">data</ref>).work([A](){</highlight></codeline>
<codeline><highlight class="normal"><sp/><sp/></highlight><highlight class="keyword">auto</highlight><highlight class="normal"><sp/>d<sp/>=<sp/>*</highlight><highlight class="keyword">static_cast&lt;</highlight><highlight class="keywordtype">int</highlight><highlight class="normal">*</highlight><highlight class="keyword">&gt;</highlight><highlight class="normal">(A.data());</highlight></codeline>
<codeline><highlight class="normal"><sp/><sp/><ref refid="cpp/io/basic_ostream" kindref="compound" external="/Users/twhuang/Code/taskflow/doxygen/cppreference-doxygen-web.tag.xml">std::cout</ref><sp/>&lt;&lt;<sp/></highlight><highlight class="stringliteral">&quot;data<sp/>is<sp/>&quot;</highlight><highlight class="normal"><sp/>&lt;&lt;<sp/>d<sp/>&lt;&lt;<sp/><ref refid="cpp/io/manip/endl" kindref="compound" external="/Users/twhuang/Code/taskflow/doxygen/cppreference-doxygen-web.tag.xml">std::endl</ref>;</highlight></codeline>
<codeline><highlight class="normal">});</highlight></codeline>
<codeline><highlight class="normal"></highlight></codeline>
<codeline><highlight class="normal"></highlight><highlight class="comment">//<sp/>run<sp/>the<sp/>taskflow<sp/>iteratively<sp/>with<sp/>changing<sp/>data</highlight><highlight class="normal"></highlight></codeline>
<codeline><highlight class="normal"></highlight><highlight class="keywordflow">for</highlight><highlight class="normal">(<ref refid="classtf_1_1Task_1a320827cb70295a6fe2cc37691405409c" kindref="member">data</ref><sp/>=<sp/>0;<sp/><ref refid="classtf_1_1Task_1a320827cb70295a6fe2cc37691405409c" kindref="member">data</ref>&lt;10;<sp/><ref refid="classtf_1_1Task_1a320827cb70295a6fe2cc37691405409c" kindref="member">data</ref>++){</highlight></codeline>
<codeline><highlight class="normal"><sp/><sp/>executor.<ref refid="classtf_1_1Executor_1a519777f5783981d534e9e53b99712069" kindref="member">run</ref>(taskflow).wait();</highlight></codeline>
<codeline><highlight class="normal">}</highlight></codeline>
</programlisting></para>
<para><simplesect kind="return"><para><computeroutput>*this</computeroutput> </para>
</simplesect>
</para>
        </detaileddescription>
        <inbodydescription>
        </inbodydescription>
        <location file="/Users/twhuang/Code/taskflow/taskflow/core/task.hpp" line="309" column="10" bodyfile="/Users/twhuang/Code/taskflow/taskflow/core/task.hpp" bodystart="582" bodyend="585"/>
      </memberdef>
      <memberdef kind="function" id="classtf_1_1Task_1a65ba160c1464b4084f85bd9d3dd41291" prot="public" static="no" const="no" explicit="no" inline="yes" virt="non-virtual">
        <type><ref refid="classtf_1_1Task" kindref="compound">Task</ref> &amp;</type>
        <definition>Task &amp; tf::Task::priority</definition>
        <argsstring>(TaskPriority p)</argsstring>
        <name>priority</name>
        <qualifiedname>tf::Task::priority</qualifiedname>
        <param>
          <type><ref refid="namespacetf_1ac9f4add8f716ed323b0bdbbc1d89346f" kindref="member">TaskPriority</ref></type>
          <declname>p</declname>
        </param>
        <briefdescription>
<para>assigns a priority value to the task </para>
        </briefdescription>
        <detaileddescription>
<para>A priority value can be one of the following three levels, <ref refid="namespacetf_1ac9f4add8f716ed323b0bdbbc1d89346fab89de3b4b81c4facfac906edf29aec8c" kindref="member">tf::TaskPriority::HIGH</ref> (numerically equivalent to 0), <ref refid="namespacetf_1ac9f4add8f716ed323b0bdbbc1d89346fa1e23852820b9154316c7c06e2b7ba051" kindref="member">tf::TaskPriority::NORMAL</ref> (numerically equivalent to 1), and <ref refid="namespacetf_1ac9f4add8f716ed323b0bdbbc1d89346fa41bc94cbd8eebea13ce0491b2ac11b88" kindref="member">tf::TaskPriority::LOW</ref> (numerically equivalent to 2). The smaller the priority value, the higher the priority. </para>
        </detaileddescription>
        <inbodydescription>
        </inbodydescription>
        <location file="/Users/twhuang/Code/taskflow/taskflow/core/task.hpp" line="320" column="10" bodyfile="/Users/twhuang/Code/taskflow/taskflow/core/task.hpp" bodystart="588" bodyend="591"/>
      </memberdef>
      <memberdef kind="function" id="classtf_1_1Task_1ab90b3e898dfb4a8d24ccc99b615bbd9a" prot="public" static="no" const="yes" explicit="no" inline="yes" virt="non-virtual">
        <type><ref refid="namespacetf_1ac9f4add8f716ed323b0bdbbc1d89346f" kindref="member">TaskPriority</ref></type>
        <definition>TaskPriority tf::Task::priority</definition>
        <argsstring>() const</argsstring>
        <name>priority</name>
        <qualifiedname>tf::Task::priority</qualifiedname>
        <briefdescription>
<para>queries the priority value of the task </para>
        </briefdescription>
        <detaileddescription>
        </detaileddescription>
        <inbodydescription>
        </inbodydescription>
        <location file="/Users/twhuang/Code/taskflow/taskflow/core/task.hpp" line="325" column="18" bodyfile="/Users/twhuang/Code/taskflow/taskflow/core/task.hpp" bodystart="594" bodyend="596"/>
      </memberdef>
      <memberdef kind="function" id="classtf_1_1Task_1a302f51ed717d0a4e99edc50f92a571f3" prot="public" static="no" const="no" explicit="no" inline="yes" virt="non-virtual">
        <type>void</type>
        <definition>void tf::Task::reset</definition>
        <argsstring>()</argsstring>
        <name>reset</name>
        <qualifiedname>tf::Task::reset</qualifiedname>
        <briefdescription>
<para>resets the task handle to null </para>
        </briefdescription>
        <detaileddescription>
        </detaileddescription>
        <inbodydescription>
        </inbodydescription>
        <location file="/Users/twhuang/Code/taskflow/taskflow/core/task.hpp" line="330" column="10" bodyfile="/Users/twhuang/Code/taskflow/taskflow/core/task.hpp" bodystart="466" bodyend="468"/>
      </memberdef>
      <memberdef kind="function" id="classtf_1_1Task_1aec3ab712e12137542b7e4bc311ee9f20" prot="public" static="no" const="no" explicit="no" inline="yes" virt="non-virtual">
        <type>void</type>
        <definition>void tf::Task::reset_work</definition>
        <argsstring>()</argsstring>
        <name>reset_work</name>
        <qualifiedname>tf::Task::reset_work</qualifiedname>
        <briefdescription>
<para>resets the associated work to a placeholder </para>
        </briefdescription>
        <detaileddescription>
        </detaileddescription>
        <inbodydescription>
        </inbodydescription>
        <location file="/Users/twhuang/Code/taskflow/taskflow/core/task.hpp" line="335" column="10" bodyfile="/Users/twhuang/Code/taskflow/taskflow/core/task.hpp" bodystart="471" bodyend="473"/>
      </memberdef>
      <memberdef kind="function" id="classtf_1_1Task_1a8149edcf9ec2bfac18dd171f7a55ce06" prot="public" static="no" const="yes" explicit="no" inline="yes" virt="non-virtual">
        <type>bool</type>
        <definition>bool tf::Task::empty</definition>
        <argsstring>() const</argsstring>
        <name>empty</name>
        <qualifiedname>tf::Task::empty</qualifiedname>
        <briefdescription>
<para>queries if the task handle points to a task node </para>
        </briefdescription>
        <detaileddescription>
        </detaileddescription>
        <inbodydescription>
        </inbodydescription>
        <location file="/Users/twhuang/Code/taskflow/taskflow/core/task.hpp" line="340" column="10" bodyfile="/Users/twhuang/Code/taskflow/taskflow/core/task.hpp" bodystart="501" bodyend="503"/>
      </memberdef>
      <memberdef kind="function" id="classtf_1_1Task_1afc4ecb89dd4e4645b3ec3fb7c1bb0ec5" prot="public" static="no" const="yes" explicit="no" inline="yes" virt="non-virtual">
        <type>bool</type>
        <definition>bool tf::Task::has_work</definition>
        <argsstring>() const</argsstring>
        <name>has_work</name>
        <qualifiedname>tf::Task::has_work</qualifiedname>
        <briefdescription>
<para>queries if the task has a work assigned </para>
        </briefdescription>
        <detaileddescription>
        </detaileddescription>
        <inbodydescription>
        </inbodydescription>
        <location file="/Users/twhuang/Code/taskflow/taskflow/core/task.hpp" line="345" column="10" bodyfile="/Users/twhuang/Code/taskflow/taskflow/core/task.hpp" bodystart="506" bodyend="508"/>
      </memberdef>
      <memberdef kind="function" id="classtf_1_1Task_1aff13a503d4a3c994eb08cb6f22e1b427" prot="public" static="no" const="yes" explicit="no" inline="no" virt="non-virtual">
        <templateparamlist>
          <param>
            <type>typename V</type>
          </param>
        </templateparamlist>
        <type>void</type>
        <definition>void tf::Task::for_each_successor</definition>
        <argsstring>(V &amp;&amp;visitor) const</argsstring>
        <name>for_each_successor</name>
        <qualifiedname>tf::Task::for_each_successor</qualifiedname>
        <param>
          <type>V &amp;&amp;</type>
          <declname>visitor</declname>
        </param>
        <briefdescription>
<para>applies an visitor callable to each successor of the task </para>
        </briefdescription>
        <detaileddescription>
        </detaileddescription>
        <inbodydescription>
        </inbodydescription>
        <location file="/Users/twhuang/Code/taskflow/taskflow/core/task.hpp" line="351" column="10" bodyfile="/Users/twhuang/Code/taskflow/taskflow/core/task.hpp" bodystart="527" bodyend="531"/>
      </memberdef>
      <memberdef kind="function" id="classtf_1_1Task_1a3bf68937662bf291637e4a763476b2e4" prot="public" static="no" const="yes" explicit="no" inline="no" virt="non-virtual">
        <templateparamlist>
          <param>
            <type>typename V</type>
          </param>
        </templateparamlist>
        <type>void</type>
        <definition>void tf::Task::for_each_dependent</definition>
        <argsstring>(V &amp;&amp;visitor) const</argsstring>
        <name>for_each_dependent</name>
        <qualifiedname>tf::Task::for_each_dependent</qualifiedname>
        <param>
          <type>V &amp;&amp;</type>
          <declname>visitor</declname>
        </param>
        <briefdescription>
<para>applies an visitor callable to each dependents of the task </para>
        </briefdescription>
        <detaileddescription>
        </detaileddescription>
        <inbodydescription>
        </inbodydescription>
        <location file="/Users/twhuang/Code/taskflow/taskflow/core/task.hpp" line="357" column="10" bodyfile="/Users/twhuang/Code/taskflow/taskflow/core/task.hpp" bodystart="535" bodyend="539"/>
      </memberdef>
      <memberdef kind="function" id="classtf_1_1Task_1a1c9301f2a330cc23ee18e8f61688141f" prot="public" static="no" const="yes" explicit="no" inline="yes" virt="non-virtual">
        <type>size_t</type>
        <definition>size_t tf::Task::hash_value</definition>
        <argsstring>() const</argsstring>
        <name>hash_value</name>
        <qualifiedname>tf::Task::hash_value</qualifiedname>
        <briefdescription>
<para>obtains a hash value of the underlying node </para>
        </briefdescription>
        <detaileddescription>
        </detaileddescription>
        <inbodydescription>
        </inbodydescription>
        <location file="/Users/twhuang/Code/taskflow/taskflow/core/task.hpp" line="362" column="12" bodyfile="/Users/twhuang/Code/taskflow/taskflow/core/task.hpp" bodystart="542" bodyend="544"/>
      </memberdef>
      <memberdef kind="function" id="classtf_1_1Task_1af2df95e6c8c5870c033d692e88af0bc2" prot="public" static="no" const="yes" explicit="no" inline="yes" virt="non-virtual">
        <type><ref refid="namespacetf_1a1355048578785a80414707ff308b395a" kindref="member">TaskType</ref></type>
        <definition>TaskType tf::Task::type</definition>
        <argsstring>() const</argsstring>
        <name>type</name>
        <qualifiedname>tf::Task::type</qualifiedname>
        <briefdescription>
<para>returns the task type </para>
        </briefdescription>
        <detaileddescription>
        </detaileddescription>
        <inbodydescription>
        </inbodydescription>
        <location file="/Users/twhuang/Code/taskflow/taskflow/core/task.hpp" line="367" column="14" bodyfile="/Users/twhuang/Code/taskflow/taskflow/core/task.hpp" bodystart="511" bodyend="523"/>
      </memberdef>
      <memberdef kind="function" id="classtf_1_1Task_1a3318a49ff9d0a01cd1e8ee675251e3b7" prot="public" static="no" const="yes" explicit="no" inline="yes" virt="non-virtual">
        <type>void</type>
        <definition>void tf::Task::dump</definition>
        <argsstring>(std::ostream &amp;ostream) const</argsstring>
        <name>dump</name>
        <qualifiedname>tf::Task::dump</qualifiedname>
        <param>
          <type><ref refid="cpp/io/basic_ostream" kindref="compound" external="/Users/twhuang/Code/taskflow/doxygen/cppreference-doxygen-web.tag.xml">std::ostream</ref> &amp;</type>
          <declname>ostream</declname>
        </param>
        <briefdescription>
<para>dumps the task through an output stream </para>
        </briefdescription>
        <detaileddescription>
        </detaileddescription>
        <inbodydescription>
        </inbodydescription>
        <location file="/Users/twhuang/Code/taskflow/taskflow/core/task.hpp" line="372" column="10" bodyfile="/Users/twhuang/Code/taskflow/taskflow/core/task.hpp" bodystart="547" bodyend="552"/>
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      <memberdef kind="function" id="classtf_1_1Task_1a320827cb70295a6fe2cc37691405409c" prot="public" static="no" const="yes" explicit="no" inline="yes" virt="non-virtual">
        <type>void *</type>
        <definition>void * tf::Task::data</definition>
        <argsstring>() const</argsstring>
        <name>data</name>
        <qualifiedname>tf::Task::data</qualifiedname>
        <briefdescription>
<para>queries pointer to user data </para>
        </briefdescription>
        <detaileddescription>
        </detaileddescription>
        <inbodydescription>
        </inbodydescription>
        <location file="/Users/twhuang/Code/taskflow/taskflow/core/task.hpp" line="377" column="10" bodyfile="/Users/twhuang/Code/taskflow/taskflow/core/task.hpp" bodystart="577" bodyend="579"/>
      </memberdef>
      </sectiondef>
      <sectiondef kind="private-func">
      <memberdef kind="function" id="classtf_1_1Task_1a43d108a6cc0417cc470a00b5e95a65f5" prot="private" static="no" const="no" explicit="no" inline="yes" virt="non-virtual">
        <type></type>
        <definition>tf::Task::Task</definition>
        <argsstring>(Node *)</argsstring>
        <name>Task</name>
        <qualifiedname>tf::Task::Task</qualifiedname>
        <param>
          <type>Node *</type>
          <defname>node</defname>
        </param>
        <briefdescription>
        </briefdescription>
        <detaileddescription>
        </detaileddescription>
        <inbodydescription>
        </inbodydescription>
        <location file="/Users/twhuang/Code/taskflow/taskflow/core/task.hpp" line="382" column="5" bodyfile="/Users/twhuang/Code/taskflow/taskflow/core/task.hpp" bodystart="388" bodyend="389"/>
      </memberdef>
      </sectiondef>
    <briefdescription>
<para>class to create a task handle over a node in a taskflow graph </para>
    </briefdescription>
    <detaileddescription>
<para>A task is a wrapper over a node in a taskflow graph. It provides a set of methods for users to access and modify the attributes of the associated node in the taskflow graph. A task is very lightweight object (i.e., only storing a node pointer) that can be trivially copied around, and it does not own the lifetime of the associated node. </para>
    </detaileddescription>
    <location file="/Users/twhuang/Code/taskflow/taskflow/core/task.hpp" line="149" column="1" bodyfile="/Users/twhuang/Code/taskflow/taskflow/core/task.hpp" bodystart="149" bodyend="385"/>
    <listofallmembers>
      <member refid="classtf_1_1Task_1abff81069222d0f449e0b43136aea2f05" prot="private" virt="non-virtual"><scope>tf::Task</scope><name>_node</name></member>
      <member refid="classtf_1_1Task_1a076ab9c6f3a0346e16cfb5fee7dc4ce8" prot="public" virt="non-virtual"><scope>tf::Task</scope><name>acquire</name></member>
      <member refid="classtf_1_1Task_1ab38be520fe700cb4ca1f312308a95585" prot="public" virt="non-virtual"><scope>tf::Task</scope><name>composed_of</name></member>
      <member refid="classtf_1_1Task_1afd82ab6d6518d1142a72c4d2c97ff114" prot="public" virt="non-virtual"><scope>tf::Task</scope><name>data</name></member>
      <member refid="classtf_1_1Task_1a320827cb70295a6fe2cc37691405409c" prot="public" virt="non-virtual"><scope>tf::Task</scope><name>data</name></member>
      <member refid="classtf_1_1Task_1a3318a49ff9d0a01cd1e8ee675251e3b7" prot="public" virt="non-virtual"><scope>tf::Task</scope><name>dump</name></member>
      <member refid="classtf_1_1Task_1a8149edcf9ec2bfac18dd171f7a55ce06" prot="public" virt="non-virtual"><scope>tf::Task</scope><name>empty</name></member>
      <member refid="classtf_1_1Task_1a763b2f90bc53f92d680a635fe28e858e" prot="private" virt="non-virtual"><scope>tf::Task</scope><name>Executor</name></member>
      <member refid="classtf_1_1Task_1a61184f9bd9c801d0a5eccecfdbddc641" prot="private" virt="non-virtual"><scope>tf::Task</scope><name>FlowBuilder</name></member>
      <member refid="classtf_1_1Task_1a3bf68937662bf291637e4a763476b2e4" prot="public" virt="non-virtual"><scope>tf::Task</scope><name>for_each_dependent</name></member>
      <member refid="classtf_1_1Task_1aff13a503d4a3c994eb08cb6f22e1b427" prot="public" virt="non-virtual"><scope>tf::Task</scope><name>for_each_successor</name></member>
      <member refid="classtf_1_1Task_1afc4ecb89dd4e4645b3ec3fb7c1bb0ec5" prot="public" virt="non-virtual"><scope>tf::Task</scope><name>has_work</name></member>
      <member refid="classtf_1_1Task_1a1c9301f2a330cc23ee18e8f61688141f" prot="public" virt="non-virtual"><scope>tf::Task</scope><name>hash_value</name></member>
      <member refid="classtf_1_1Task_1a08ada0425b490997b6ff7f310107e5e3" prot="public" virt="non-virtual"><scope>tf::Task</scope><name>name</name></member>
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</doxygen>
