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<h1>ischosen</h1>
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<p>This function returns the value <b><font face="Courier New">true</font></b> if and only if the data object reference specifies the variant of the <b><font face="Courier New">union</font></b>
type that is actually selected for a given data object.
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<p>Related keyword:</p>
<ul>
<li><b><font face="Courier New" size="4" color="#003258"><a href="boolean.html">boolean</a></font></b></li>
<li><b><a href="true.html"><font face="Courier New" size="4" color="#003258">true</font></a></b></li>
<li><b><a href="false.html"><font face="Courier New" size="4" color="#003258">false</font></a></b></li>
<li><b><a href="union.html"><font face="Courier New" size="4" color="#003258">union</font></a></b></li>
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<h3 align="center"><font face="Courier New" color="#003258" size="5"><b>ischosen</b></font><font face="Courier New" color="#003258" size="5"><b>(</b></font><i>any_type value</i><font
face="Courier New" color="#003258" size="5"><b>) return boolean</b></font></h3>
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<p>Example 1:</p>
<p><font face="Courier New"> type union MyUnion<br>
{ PDU_type1 p1,<br>
PDU_type2 p2,<br>
PDU_type p3<br>
}<br>
<br>
<p>...
<p> // and given that MyPDU is a template of MyUnion type<br>
// and received_PDU is also of MyUnion type <br>
// then <br>
MyPort.receive(MyPDU) -> value received_PDU<br>
<br>
ischosen(received_PDU.p2)<br>
// returns true if the actual instance of MyPDU carries a PDU of the type PDU_type2
</font></p>
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