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26<a name="period"></a><div class="titlepage"></div>
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28<h2><span class="refentrytitle">Class template period</span></h2>
29<p>boost::date_time::period &#8212; Provides generalized period type useful in date-time systems. </p>
30</div>
31<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
32<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="bold"><strong>template</strong></span>&lt;<span class="bold"><strong>typename</strong></span> point_rep, <span class="bold"><strong>typename</strong></span> duration_rep&gt; 
33<span class="bold"><strong>class</strong></span> period {
34<span class="bold"><strong>public</strong></span>:
35  <span class="emphasis"><em>// types</em></span>
36  <span class="bold"><strong>typedef</strong></span> point_rep    point_type;   
37  <span class="bold"><strong>typedef</strong></span> duration_rep duration_type;
38
39  <span class="emphasis"><em>// <a href="period.html#periodconstruct-copy-destruct">construct/copy/destruct</a></em></span>
40  <a href="period.html#id2410155-bb">period</a>(point_rep, point_rep);
41  <a href="period.html#id2410192-bb">period</a>(point_rep, duration_rep);
42
43  <span class="emphasis"><em>// <a href="period.html#id2458307-bb">public member functions</a></em></span>
44  <span class="type">point_rep</span> <a href="period.html#id2458311-bb">begin</a>() <span class="bold"><strong>const</strong></span>;
45  <span class="type">point_rep</span> <a href="period.html#id2442552-bb">end</a>() <span class="bold"><strong>const</strong></span>;
46  <span class="type">point_rep</span> <a href="period.html#id2442568-bb">last</a>() <span class="bold"><strong>const</strong></span>;
47  <span class="type">duration_rep</span> <a href="period.html#id2442584-bb">length</a>() <span class="bold"><strong>const</strong></span>;
48  <span class="type"><span class="bold"><strong>bool</strong></span></span> <a href="period.html#id2477874-bb">is_null</a>() <span class="bold"><strong>const</strong></span>;
49  <span class="type"><span class="bold"><strong>bool</strong></span></span> <a href="period.html#id2477891-bb"><span class="bold"><strong>operator</strong></span>==</a>(<span class="bold"><strong>const</strong></span> <a href="period.html" title="Class template period">period</a> &amp;) <span class="bold"><strong>const</strong></span>;
50  <span class="type"><span class="bold"><strong>bool</strong></span></span> <a href="period.html#id2417421-bb"><span class="bold"><strong>operator</strong></span>&lt;</a>(<span class="bold"><strong>const</strong></span> <a href="period.html" title="Class template period">period</a> &amp;) <span class="bold"><strong>const</strong></span>;
51  <span class="type"><span class="bold"><strong>void</strong></span></span> <a href="period.html#id2417451-bb">shift</a>(<span class="bold"><strong>const</strong></span> duration_rep &amp;) ;
52  <span class="type"><span class="bold"><strong>bool</strong></span></span> <a href="period.html#id2457178-bb">contains</a>(<span class="bold"><strong>const</strong></span> point_rep &amp;) <span class="bold"><strong>const</strong></span>;
53  <span class="type"><span class="bold"><strong>bool</strong></span></span> <a href="period.html#id2457205-bb">contains</a>(<span class="bold"><strong>const</strong></span> <a href="period.html" title="Class template period">period</a> &amp;) <span class="bold"><strong>const</strong></span>;
54  <span class="type"><span class="bold"><strong>bool</strong></span></span> <a href="period.html#id2452458-bb">intersects</a>(<span class="bold"><strong>const</strong></span> <a href="period.html" title="Class template period">period</a> &amp;) <span class="bold"><strong>const</strong></span>;
55  <span class="type"><span class="bold"><strong>bool</strong></span></span> <a href="period.html#id2453088-bb">is_adjacent</a>(<span class="bold"><strong>const</strong></span> <a href="period.html" title="Class template period">period</a> &amp;) <span class="bold"><strong>const</strong></span>;
56  <span class="type"><span class="bold"><strong>bool</strong></span></span> <a href="period.html#id2453119-bb">is_before</a>(<span class="bold"><strong>const</strong></span> point_rep &amp;) <span class="bold"><strong>const</strong></span>;
57  <span class="type"><span class="bold"><strong>bool</strong></span></span> <a href="period.html#id2393884-bb">is_after</a>(<span class="bold"><strong>const</strong></span> point_rep &amp;) <span class="bold"><strong>const</strong></span>;
58  <span class="type"><a href="period.html" title="Class template period">period</a></span> <a href="period.html#id2393911-bb">intersection</a>(<span class="bold"><strong>const</strong></span> <a href="period.html" title="Class template period">period</a> &amp;) <span class="bold"><strong>const</strong></span>;
59  <span class="type"><a href="period.html" title="Class template period">period</a></span> <a href="period.html#id2432541-bb">merge</a>(<span class="bold"><strong>const</strong></span> <a href="period.html" title="Class template period">period</a> &amp;) <span class="bold"><strong>const</strong></span>;
60  <span class="type"><a href="period.html" title="Class template period">period</a></span> <a href="period.html#id2472159-bb">span</a>(<span class="bold"><strong>const</strong></span> <a href="period.html" title="Class template period">period</a> &amp;) <span class="bold"><strong>const</strong></span>;
61};</pre></div>
62<div class="refsect1" lang="en">
63<a name="id2646299"></a><h2>Description</h2>
64<p>This template uses a class to represent a time point within the period and another class to represent a duration. As a result, this class is not appropriate for use when the number and duration representation are the same (eg: in the regular number domain).</p>
65<p>A period can be specified by providing either the begining point and a duration or the begining point and the end point( end is NOT part of the period but 1 unit past it. A period will be "invalid" if either end_point &lt;= begin_point or the given duration is &lt;= 0. Any valid period will return false for is_null().</p>
66<p>Zero length periods are also considered invalid. Zero length periods are periods where the begining and end points are the same, or, the given duration is zero. For a zero length period, the last point will be one unit less than the begining point.</p>
67<p>In the case that the begin and last are the same, the period has a length of one unit.</p>
68<p>The best way to handle periods is usually to provide a begining point and a duration. So, day1 + 7 days is a week period which includes all of the first day and 6 more days (eg: Sun to Sat). </p>
69<div class="refsect2" lang="en">
70<a name="id2646334"></a><h3>
71<a name="periodconstruct-copy-destruct"></a><code class="computeroutput">period</code> construct/copy/destruct</h3>
72<div class="orderedlist"><ol type="1">
73<li>
74<pre class="literallayout"><a name="id2410155-bb"></a>period(point_rep first_point, point_rep end_point);</pre>
75<p>If end &lt;= begin then the period will be invalid </p>
76</li>
77<li>
78<pre class="literallayout"><a name="id2410192-bb"></a>period(point_rep first_point, duration_rep len);</pre>
79<p>If len is &lt;= 0 then the period will be invalid </p>
80</li>
81</ol></div>
82</div>
83<div class="refsect2" lang="en">
84<a name="id2646392"></a><h3>
85<a name="id2458307-bb"></a><code class="computeroutput">period</code> public member functions</h3>
86<div class="orderedlist"><ol type="1">
87<li><pre class="literallayout"><span class="type">point_rep</span> <a name="id2458311-bb"></a>begin() <span class="bold"><strong>const</strong></span>;</pre></li>
88<li><pre class="literallayout"><span class="type">point_rep</span> <a name="id2442552-bb"></a>end() <span class="bold"><strong>const</strong></span>;</pre></li>
89<li><pre class="literallayout"><span class="type">point_rep</span> <a name="id2442568-bb"></a>last() <span class="bold"><strong>const</strong></span>;</pre></li>
90<li><pre class="literallayout"><span class="type">duration_rep</span> <a name="id2442584-bb"></a>length() <span class="bold"><strong>const</strong></span>;</pre></li>
91<li><pre class="literallayout"><span class="type"><span class="bold"><strong>bool</strong></span></span> <a name="id2477874-bb"></a>is_null() <span class="bold"><strong>const</strong></span>;</pre></li>
92<li><pre class="literallayout"><span class="type"><span class="bold"><strong>bool</strong></span></span> <a name="id2477891-bb"></a><span class="bold"><strong>operator</strong></span>==(<span class="bold"><strong>const</strong></span> <a href="period.html" title="Class template period">period</a> &amp; rhs) <span class="bold"><strong>const</strong></span>;</pre></li>
93<li><pre class="literallayout"><span class="type"><span class="bold"><strong>bool</strong></span></span> <a name="id2417421-bb"></a><span class="bold"><strong>operator</strong></span>&lt;(<span class="bold"><strong>const</strong></span> <a href="period.html" title="Class template period">period</a> &amp; rhs) <span class="bold"><strong>const</strong></span>;</pre></li>
94<li><pre class="literallayout"><span class="type"><span class="bold"><strong>void</strong></span></span> <a name="id2417451-bb"></a>shift(<span class="bold"><strong>const</strong></span> duration_rep &amp; d) ;</pre></li>
95<li><pre class="literallayout"><span class="type"><span class="bold"><strong>bool</strong></span></span> <a name="id2457178-bb"></a>contains(<span class="bold"><strong>const</strong></span> point_rep &amp; point) <span class="bold"><strong>const</strong></span>;</pre></li>
96<li><pre class="literallayout"><span class="type"><span class="bold"><strong>bool</strong></span></span> <a name="id2457205-bb"></a>contains(<span class="bold"><strong>const</strong></span> <a href="period.html" title="Class template period">period</a> &amp; other) <span class="bold"><strong>const</strong></span>;</pre></li>
97<li><pre class="literallayout"><span class="type"><span class="bold"><strong>bool</strong></span></span> <a name="id2452458-bb"></a>intersects(<span class="bold"><strong>const</strong></span> <a href="period.html" title="Class template period">period</a> &amp; other) <span class="bold"><strong>const</strong></span>;</pre></li>
98<li><pre class="literallayout"><span class="type"><span class="bold"><strong>bool</strong></span></span> <a name="id2453088-bb"></a>is_adjacent(<span class="bold"><strong>const</strong></span> <a href="period.html" title="Class template period">period</a> &amp; other) <span class="bold"><strong>const</strong></span>;</pre></li>
99<li><pre class="literallayout"><span class="type"><span class="bold"><strong>bool</strong></span></span> <a name="id2453119-bb"></a>is_before(<span class="bold"><strong>const</strong></span> point_rep &amp; point) <span class="bold"><strong>const</strong></span>;</pre></li>
100<li><pre class="literallayout"><span class="type"><span class="bold"><strong>bool</strong></span></span> <a name="id2393884-bb"></a>is_after(<span class="bold"><strong>const</strong></span> point_rep &amp; point) <span class="bold"><strong>const</strong></span>;</pre></li>
101<li><pre class="literallayout"><span class="type"><a href="period.html" title="Class template period">period</a></span> <a name="id2393911-bb"></a>intersection(<span class="bold"><strong>const</strong></span> <a href="period.html" title="Class template period">period</a> &amp; other) <span class="bold"><strong>const</strong></span>;</pre></li>
102<li><pre class="literallayout"><span class="type"><a href="period.html" title="Class template period">period</a></span> <a name="id2432541-bb"></a>merge(<span class="bold"><strong>const</strong></span> <a href="period.html" title="Class template period">period</a> &amp; other) <span class="bold"><strong>const</strong></span>;</pre></li>
103<li>
104<pre class="literallayout"><span class="type"><a href="period.html" title="Class template period">period</a></span> <a name="id2472159-bb"></a>span(<span class="bold"><strong>const</strong></span> <a href="period.html" title="Class template period">period</a> &amp; other) <span class="bold"><strong>const</strong></span>;</pre>
105<p>Combines two periods and any gap between them such that start = min(p1.start, p2.start) end = max(p1.end , p2.end) </p>
106<pre class="programlisting">        [---p1---)
107                       [---p2---)
108 result:
109        [-----------p3----------)
110   *
111</pre>
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