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| 13 | <title>deactivate</title> |
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| 31 | <hr> |
| 32 | <h1>deactivate</h1> |
| 33 | <hr align="left" width="75%"> |
| 34 | <p>The operation is used to deactivate an already activated default context (i.e., an <a href="altstep.html"><b><font face="Courier New" size="4">altstep</font></b></a>).</p> |
| 35 | <ul> |
| 36 | <li>Default context is a set of branches (cf. <a href="altstep.html"><b><font face="Courier New" size="4">altstep</font></b></a>) that is implicitly appended at the end of all <a |
| 37 | href="alt.html"><b><font size="4" face="Courier New">alt</font></b></a> statements (except if the alt has an else branch) and after all stand-alone receive/timeout/done … statements. When no |
| 38 | branch of the alt matches the received message, the previously activated default(s) are examined.</li> |
| 39 | <li>It is possible to deactivate the activated defaults one by one.</li> |
| 40 | </ul> |
| 41 | <p>Related keywords:</p> |
| 42 | <ul> |
| 43 | <li><a href="activate.html"><b><font face="Courier New" color="#003258" size="4">activate</font></b></a></li> |
| 44 | <li><a href="alt.html"><b><font face="Courier New" color="#003258" size="4">alt</font></b></a></li> |
| 45 | <li><a href="altstep.html"><b><font face="Courier New" color="#003258" size="4">alstep</font></b></a></li> |
| 46 | <li><a href="default.html"><b><font face="Courier New" color="#003258" size="4">default</font></b></a></li> |
| 47 | <li><a href="null.html"><b><font face="Courier New" color="#003258" size="4">null</font></b></a></li> |
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| 55 | <h3 align="center"><font face="Courier New" color="#003258" size="5"><b>deactivate(</b></font><i>default_ref</i><font face="Courier New" color="#003258" size="5"><b>)</b></font></h3> |
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| 58 | </table> |
| 59 | </center> |
| 60 | </div> |
| 61 | <ul> |
| 62 | <li> |
| 63 | <p><i>default_ref</i> is the default reference referring to the altstep to be deactivated as default. |
| 64 | </li> |
| 65 | </ul> |
| 66 | <hr align="left" width="50%"> |
| 67 | <p>Example 1: |
| 68 | <p><font face="Courier New">var default vd_Default := null;<br> |
| 69 | Default := activate(as_Altstep());<br> |
| 70 | deactivate(Default);<br> |
| 71 | </font> |
| 72 | <p>The variable Default holds the reference to the altstep activated as default (as_Altstep). It is used as argument in the deactivate operation which removes the altstep from the list of |
| 73 | activated defaults.</p> |
| 74 | <hr align="left" width="25%"> |
| 75 | <hr align="left" width="25%"> |
| 76 | <p><a HREF="BNF.html#deactivatestatement">BNF definition</a> of <font face="Courier New">deactivate</font></p> |
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