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<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="boost_icl.examples.user_groups"></a><a class="link" href="user_groups.html" title="User groups">User groups</a>
</h3></div></div></div>
<p>
        Example <span class="bold"><strong>user groups</strong></span> shows the availability
        of set operations on <code class="computeroutput"><a class="link" href="../../boost/icl/interval_map.html" title="Class template interval_map">interval_maps</a></code>.
      </p>
<p>
        In the example there is a user group <code class="computeroutput"><span class="identifier">med_users</span></code>
        of a hospital staff that has the authorisation to handle medical data of
        patients. User group <code class="computeroutput"><span class="identifier">admin_users</span></code>
        has access to administrative data like health insurance and financial data.
      </p>
<p>
        The membership for each user in one of the user groups has a time interval
        of validity. The group membership begins and ends.
      </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
            Using a union operation <code class="computeroutput"><span class="special">+</span></code>
            we can have an overview over the unified user groups and the membership
            dates of employees.
          </li>
<li class="listitem">
            Computing an intersection <code class="computeroutput"><span class="special">&amp;</span></code>
            shows who is member of both med_users and admin_users at what times.
          </li>
</ul></div>
<p>
</p>
<pre class="programlisting"><span class="comment">// The next line includes &lt;boost/gregorian/date.hpp&gt;</span>
<span class="comment">// and a few lines of adapter code.</span>
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">icl</span><span class="special">/</span><span class="identifier">gregorian</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">iostream</span><span class="special">&gt;</span>
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">icl</span><span class="special">/</span><span class="identifier">interval_map</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>

<span class="keyword">using</span> <span class="keyword">namespace</span> <span class="identifier">std</span><span class="special">;</span>
<span class="keyword">using</span> <span class="keyword">namespace</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">gregorian</span><span class="special">;</span>
<span class="keyword">using</span> <span class="keyword">namespace</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">icl</span><span class="special">;</span>

<span class="comment">// Type icl::set&lt;string&gt; collects the names a user group's members. Therefore</span>
<span class="comment">// it needs to implement operator += that performs a set union on overlap of </span>
<span class="comment">// intervals.</span>
<span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">set</span><span class="special">&lt;</span><span class="identifier">string</span><span class="special">&gt;</span> <span class="identifier">MemberSetT</span><span class="special">;</span>

<span class="comment">// boost::gregorian::date is the domain type the interval map. </span>
<span class="comment">// It's key values are therefore time intervals: discrete_interval&lt;date&gt;. The content</span>
<span class="comment">// is the set of names: MemberSetT.</span>
<span class="keyword">typedef</span> <span class="identifier">interval_map</span><span class="special">&lt;</span><span class="identifier">date</span><span class="special">,</span> <span class="identifier">MemberSetT</span><span class="special">&gt;</span> <span class="identifier">MembershipT</span><span class="special">;</span>

<span class="comment">// Collect user groups for medical and administrative staff and perform</span>
<span class="comment">// union and intersection operations on the collected membership schedules.</span>
<span class="keyword">void</span> <span class="identifier">user_groups</span><span class="special">()</span>
<span class="special">{</span>
    <span class="identifier">MemberSetT</span> <span class="identifier">mary_harry</span><span class="special">;</span>
    <span class="identifier">mary_harry</span><span class="special">.</span><span class="identifier">insert</span><span class="special">(</span><span class="string">"Mary"</span><span class="special">);</span>
    <span class="identifier">mary_harry</span><span class="special">.</span><span class="identifier">insert</span><span class="special">(</span><span class="string">"Harry"</span><span class="special">);</span>

    <span class="identifier">MemberSetT</span> <span class="identifier">diana_susan</span><span class="special">;</span>
    <span class="identifier">diana_susan</span><span class="special">.</span><span class="identifier">insert</span><span class="special">(</span><span class="string">"Diana"</span><span class="special">);</span>
    <span class="identifier">diana_susan</span><span class="special">.</span><span class="identifier">insert</span><span class="special">(</span><span class="string">"Susan"</span><span class="special">);</span>

    <span class="identifier">MemberSetT</span> <span class="identifier">chief_physician</span><span class="special">;</span>
    <span class="identifier">chief_physician</span><span class="special">.</span><span class="identifier">insert</span><span class="special">(</span><span class="string">"Dr.Jekyll"</span><span class="special">);</span>

    <span class="identifier">MemberSetT</span> <span class="identifier">director_of_admin</span><span class="special">;</span>
    <span class="identifier">director_of_admin</span><span class="special">.</span><span class="identifier">insert</span><span class="special">(</span><span class="string">"Mr.Hyde"</span><span class="special">);</span>

    <span class="comment">//----- Collecting members of user group: med_users -------------------</span>
    <span class="identifier">MembershipT</span> <span class="identifier">med_users</span><span class="special">;</span>

    <span class="identifier">med_users</span><span class="special">.</span><span class="identifier">add</span><span class="special">(</span> <span class="comment">// add and element</span>
      <span class="identifier">make_pair</span><span class="special">(</span>
        <span class="identifier">discrete_interval</span><span class="special">&lt;</span><span class="identifier">date</span><span class="special">&gt;::</span><span class="identifier">closed</span><span class="special">(</span>
          <span class="identifier">from_string</span><span class="special">(</span><span class="string">"2008-01-01"</span><span class="special">),</span> <span class="identifier">from_string</span><span class="special">(</span><span class="string">"2008-12-31"</span><span class="special">)),</span> <span class="identifier">mary_harry</span><span class="special">));</span>

    <span class="identifier">med_users</span> <span class="special">+=</span>  <span class="comment">// element addition can also be done via operator +=</span>
      <span class="identifier">make_pair</span><span class="special">(</span>
        <span class="identifier">discrete_interval</span><span class="special">&lt;</span><span class="identifier">date</span><span class="special">&gt;::</span><span class="identifier">closed</span><span class="special">(</span>
          <span class="identifier">from_string</span><span class="special">(</span><span class="string">"2008-01-15"</span><span class="special">),</span> <span class="identifier">from_string</span><span class="special">(</span><span class="string">"2008-12-31"</span><span class="special">)),</span>
          <span class="identifier">chief_physician</span><span class="special">);</span>

    <span class="identifier">med_users</span> <span class="special">+=</span>
      <span class="identifier">make_pair</span><span class="special">(</span>
        <span class="identifier">discrete_interval</span><span class="special">&lt;</span><span class="identifier">date</span><span class="special">&gt;::</span><span class="identifier">closed</span><span class="special">(</span>
          <span class="identifier">from_string</span><span class="special">(</span><span class="string">"2008-02-01"</span><span class="special">),</span> <span class="identifier">from_string</span><span class="special">(</span><span class="string">"2008-10-15"</span><span class="special">)),</span>
          <span class="identifier">director_of_admin</span><span class="special">);</span>

    <span class="comment">//----- Collecting members of user group: admin_users ------------------</span>
    <span class="identifier">MembershipT</span> <span class="identifier">admin_users</span><span class="special">;</span>

    <span class="identifier">admin_users</span> <span class="special">+=</span> <span class="comment">// element addition can also be done via operator +=</span>
      <span class="identifier">make_pair</span><span class="special">(</span>
        <span class="identifier">discrete_interval</span><span class="special">&lt;</span><span class="identifier">date</span><span class="special">&gt;::</span><span class="identifier">closed</span><span class="special">(</span>
          <span class="identifier">from_string</span><span class="special">(</span><span class="string">"2008-03-20"</span><span class="special">),</span> <span class="identifier">from_string</span><span class="special">(</span><span class="string">"2008-09-30"</span><span class="special">)),</span> <span class="identifier">diana_susan</span><span class="special">);</span>

    <span class="identifier">admin_users</span> <span class="special">+=</span>
      <span class="identifier">make_pair</span><span class="special">(</span>
        <span class="identifier">discrete_interval</span><span class="special">&lt;</span><span class="identifier">date</span><span class="special">&gt;::</span><span class="identifier">closed</span><span class="special">(</span>
          <span class="identifier">from_string</span><span class="special">(</span><span class="string">"2008-01-15"</span><span class="special">),</span> <span class="identifier">from_string</span><span class="special">(</span><span class="string">"2008-12-31"</span><span class="special">)),</span>
          <span class="identifier">chief_physician</span><span class="special">);</span>

    <span class="identifier">admin_users</span> <span class="special">+=</span>
      <span class="identifier">make_pair</span><span class="special">(</span>
        <span class="identifier">discrete_interval</span><span class="special">&lt;</span><span class="identifier">date</span><span class="special">&gt;::</span><span class="identifier">closed</span><span class="special">(</span>
          <span class="identifier">from_string</span><span class="special">(</span><span class="string">"2008-02-01"</span><span class="special">),</span> <span class="identifier">from_string</span><span class="special">(</span><span class="string">"2008-10-15"</span><span class="special">)),</span>
          <span class="identifier">director_of_admin</span><span class="special">);</span>

    <span class="identifier">MembershipT</span> <span class="identifier">all_users</span>   <span class="special">=</span> <span class="identifier">med_users</span> <span class="special">+</span> <span class="identifier">admin_users</span><span class="special">;</span>

    <span class="identifier">MembershipT</span> <span class="identifier">super_users</span> <span class="special">=</span> <span class="identifier">med_users</span> <span class="special">&amp;</span> <span class="identifier">admin_users</span><span class="special">;</span>

    <span class="identifier">MembershipT</span><span class="special">::</span><span class="identifier">iterator</span> <span class="identifier">med_</span> <span class="special">=</span> <span class="identifier">med_users</span><span class="special">.</span><span class="identifier">begin</span><span class="special">();</span>
    <span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"----- Membership of medical staff -----------------------------------\n"</span><span class="special">;</span>
    <span class="keyword">while</span><span class="special">(</span><span class="identifier">med_</span> <span class="special">!=</span> <span class="identifier">med_users</span><span class="special">.</span><span class="identifier">end</span><span class="special">())</span>
    <span class="special">{</span>
        <span class="identifier">discrete_interval</span><span class="special">&lt;</span><span class="identifier">date</span><span class="special">&gt;</span> <span class="identifier">when</span> <span class="special">=</span> <span class="special">(*</span><span class="identifier">med_</span><span class="special">).</span><span class="identifier">first</span><span class="special">;</span>
        <span class="comment">// Who is member of group med_users within the time interval 'when' ?</span>
        <span class="identifier">MemberSetT</span> <span class="identifier">who</span> <span class="special">=</span> <span class="special">(*</span><span class="identifier">med_</span><span class="special">++).</span><span class="identifier">second</span><span class="special">;</span>
        <span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"["</span> <span class="special">&lt;&lt;</span> <span class="identifier">first</span><span class="special">(</span><span class="identifier">when</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="string">" - "</span> <span class="special">&lt;&lt;</span> <span class="identifier">last</span><span class="special">(</span><span class="identifier">when</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="string">"]"</span>
             <span class="special">&lt;&lt;</span> <span class="string">": "</span> <span class="special">&lt;&lt;</span> <span class="identifier">who</span> <span class="special">&lt;&lt;</span> <span class="identifier">endl</span><span class="special">;</span>
    <span class="special">}</span>

    <span class="identifier">MembershipT</span><span class="special">::</span><span class="identifier">iterator</span> <span class="identifier">admin_</span> <span class="special">=</span> <span class="identifier">admin_users</span><span class="special">.</span><span class="identifier">begin</span><span class="special">();</span>
    <span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"----- Membership of admin staff -------------------------------------\n"</span><span class="special">;</span>
    <span class="keyword">while</span><span class="special">(</span><span class="identifier">admin_</span> <span class="special">!=</span> <span class="identifier">admin_users</span><span class="special">.</span><span class="identifier">end</span><span class="special">())</span>
    <span class="special">{</span>
        <span class="identifier">discrete_interval</span><span class="special">&lt;</span><span class="identifier">date</span><span class="special">&gt;</span> <span class="identifier">when</span> <span class="special">=</span> <span class="special">(*</span><span class="identifier">admin_</span><span class="special">).</span><span class="identifier">first</span><span class="special">;</span>
        <span class="comment">// Who is member of group admin_users within the time interval 'when' ?</span>
        <span class="identifier">MemberSetT</span> <span class="identifier">who</span> <span class="special">=</span> <span class="special">(*</span><span class="identifier">admin_</span><span class="special">++).</span><span class="identifier">second</span><span class="special">;</span>
        <span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"["</span> <span class="special">&lt;&lt;</span> <span class="identifier">first</span><span class="special">(</span><span class="identifier">when</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="string">" - "</span> <span class="special">&lt;&lt;</span> <span class="identifier">last</span><span class="special">(</span><span class="identifier">when</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="string">"]"</span>
             <span class="special">&lt;&lt;</span> <span class="string">": "</span> <span class="special">&lt;&lt;</span> <span class="identifier">who</span> <span class="special">&lt;&lt;</span> <span class="identifier">endl</span><span class="special">;</span>
    <span class="special">}</span>

    <span class="identifier">MembershipT</span><span class="special">::</span><span class="identifier">iterator</span> <span class="identifier">all_</span> <span class="special">=</span> <span class="identifier">all_users</span><span class="special">.</span><span class="identifier">begin</span><span class="special">();</span>
    <span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"----- Membership of all users (med + admin) -------------------------\n"</span><span class="special">;</span>
    <span class="keyword">while</span><span class="special">(</span><span class="identifier">all_</span> <span class="special">!=</span> <span class="identifier">all_users</span><span class="special">.</span><span class="identifier">end</span><span class="special">())</span>
    <span class="special">{</span>
        <span class="identifier">discrete_interval</span><span class="special">&lt;</span><span class="identifier">date</span><span class="special">&gt;</span> <span class="identifier">when</span> <span class="special">=</span> <span class="special">(*</span><span class="identifier">all_</span><span class="special">).</span><span class="identifier">first</span><span class="special">;</span>
        <span class="comment">// Who is member of group med_users OR admin_users ?</span>
        <span class="identifier">MemberSetT</span> <span class="identifier">who</span> <span class="special">=</span> <span class="special">(*</span><span class="identifier">all_</span><span class="special">++).</span><span class="identifier">second</span><span class="special">;</span>
        <span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"["</span> <span class="special">&lt;&lt;</span> <span class="identifier">first</span><span class="special">(</span><span class="identifier">when</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="string">" - "</span> <span class="special">&lt;&lt;</span> <span class="identifier">last</span><span class="special">(</span><span class="identifier">when</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="string">"]"</span>
             <span class="special">&lt;&lt;</span> <span class="string">": "</span> <span class="special">&lt;&lt;</span> <span class="identifier">who</span> <span class="special">&lt;&lt;</span> <span class="identifier">endl</span><span class="special">;</span>
    <span class="special">}</span>

    <span class="identifier">MembershipT</span><span class="special">::</span><span class="identifier">iterator</span> <span class="identifier">super_</span> <span class="special">=</span> <span class="identifier">super_users</span><span class="special">.</span><span class="identifier">begin</span><span class="special">();</span>
    <span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"----- Membership of super users: intersection(med,admin) ------------\n"</span><span class="special">;</span>
    <span class="keyword">while</span><span class="special">(</span><span class="identifier">super_</span> <span class="special">!=</span> <span class="identifier">super_users</span><span class="special">.</span><span class="identifier">end</span><span class="special">())</span>
    <span class="special">{</span>
        <span class="identifier">discrete_interval</span><span class="special">&lt;</span><span class="identifier">date</span><span class="special">&gt;</span> <span class="identifier">when</span> <span class="special">=</span> <span class="special">(*</span><span class="identifier">super_</span><span class="special">).</span><span class="identifier">first</span><span class="special">;</span>
        <span class="comment">// Who is member of group med_users AND admin_users ?</span>
        <span class="identifier">MemberSetT</span> <span class="identifier">who</span> <span class="special">=</span> <span class="special">(*</span><span class="identifier">super_</span><span class="special">++).</span><span class="identifier">second</span><span class="special">;</span>
        <span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"["</span> <span class="special">&lt;&lt;</span> <span class="identifier">first</span><span class="special">(</span><span class="identifier">when</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="string">" - "</span> <span class="special">&lt;&lt;</span> <span class="identifier">last</span><span class="special">(</span><span class="identifier">when</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="string">"]"</span>
             <span class="special">&lt;&lt;</span> <span class="string">": "</span> <span class="special">&lt;&lt;</span> <span class="identifier">who</span> <span class="special">&lt;&lt;</span> <span class="identifier">endl</span><span class="special">;</span>
    <span class="special">}</span>

<span class="special">}</span>


<span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span>
<span class="special">{</span>
    <span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"&gt;&gt;Interval Container Library: Sample user_groups.cpp &lt;&lt;\n"</span><span class="special">;</span>
    <span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"-------------------------------------------------------\n"</span><span class="special">;</span>
    <span class="identifier">user_groups</span><span class="special">();</span>
    <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span>
<span class="special">}</span>

<span class="comment">// Program output:</span>
<span class="comment">/*-----------------------------------------------------------------------------
&gt;&gt;Interval Container Library: Sample user_groups.cpp &lt;&lt;
-------------------------------------------------------
----- Membership of medical staff -----------------------------------
[2008-Jan-01 - 2008-Jan-14]: Harry Mary
[2008-Jan-15 - 2008-Jan-31]: Dr.Jekyll Harry Mary
[2008-Feb-01 - 2008-Oct-15]: Dr.Jekyll Harry Mary Mr.Hyde
[2008-Oct-16 - 2008-Dec-31]: Dr.Jekyll Harry Mary
----- Membership of admin staff -------------------------------------
[2008-Jan-15 - 2008-Jan-31]: Dr.Jekyll
[2008-Feb-01 - 2008-Mar-19]: Dr.Jekyll Mr.Hyde
[2008-Mar-20 - 2008-Sep-30]: Diana Dr.Jekyll Mr.Hyde Susan
[2008-Oct-01 - 2008-Oct-15]: Dr.Jekyll Mr.Hyde
[2008-Oct-16 - 2008-Dec-31]: Dr.Jekyll
----- Membership of all users (med + admin) -------------------------
[2008-Jan-01 - 2008-Jan-14]: Harry Mary
[2008-Jan-15 - 2008-Jan-31]: Dr.Jekyll Harry Mary
[2008-Feb-01 - 2008-Mar-19]: Dr.Jekyll Harry Mary Mr.Hyde
[2008-Mar-20 - 2008-Sep-30]: Diana Dr.Jekyll Harry Mary Mr.Hyde Susan
[2008-Oct-01 - 2008-Oct-15]: Dr.Jekyll Harry Mary Mr.Hyde
[2008-Oct-16 - 2008-Dec-31]: Dr.Jekyll Harry Mary
----- Membership of super users: intersection(med,admin) ------------
[2008-Jan-15 - 2008-Jan-31]: Dr.Jekyll
[2008-Feb-01 - 2008-Oct-15]: Dr.Jekyll Mr.Hyde
[2008-Oct-16 - 2008-Dec-31]: Dr.Jekyll
-----------------------------------------------------------------------------*/</span>
</pre>
<p>
      </p>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright &#169; 2007-2010 Joachim
      Faulhaber<br>Copyright &#169; 1999-2006 Cortex Software
      GmbH<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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