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<title>AlwaysThrowsHandler&lt;DataObj,ParamObj&gt;</title>
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<p><font size="6" face="Bookman Old Style"><em><strong><u>dtl</u></strong></em></font></p>

<p><img src="stat.gif" width="6" height="6"> <!--end header--> <br>
</p>
<h1>AlwaysThrowsHandler&lt;DataObj, ParamObj&gt;</h1>


















<table border="0" cellpadding="0" cellspacing="0" width="100%">
    <tr>
        <td><img src="functors.gif" width="194" height="38"></td>
        <td align="right"><img src="concept.gif" width="194"
        height="39"></td>
    </tr>
    <tr>
        <td valign="top"><b>Category</b>: functors</td>
        <td align="right" valign="top"><b>Component type</b>:
        concept</td>
    </tr>
</table>
<h3>Description</h3>

<p>A <font size="2" face="Courier New">AlwaysHandler</font> is an
<font size="2" face="Courier New">IOHandler </font>function
object that is called when exceptions are thrown in <font
size="2" face="Courier New">DB_iterator</font> operations. This
handler simply tells the caller to throw the exception (<font
size="2" face="Courier New">dtl_ios_base::THROW_EXCEPTION</font>).</p>

<h3>Definition</h3>

<p>Defined in the <font size="2" face="Courier New">DBView.h</font><font
size="1" face="Courier New"> </font>header file. </p>


<h3>Associated types</h3>

<p><a href="LoggingHandler.htm"><font size="2" face="Courier New">LoggingHandler</font></a><font
size="2" face="Courier New">, </font><a href="IOHandler.htm"><font
size="2" face="Courier New">IOHandler</font></a><font size="2"
face="Courier New">.</font></p>

<h3>Public Base Classes</h3>

<p>None.</p>

<h3>Template parameters</h3>

<table border="1">
<TBODY>    <tr>
        <th>Parameter </th>
        <th>Description </th>
        <th>Default </th>
    </tr>
    <tr>
        <td valign="top"><tt>DataObj</tt> </td>
        <td valign="top">The value type of objects in a <font
        size="2" face="Courier New">DBView</font>. </td>
        <td valign="top">&nbsp; </td>
    </tr>
    <tr>
        <td valign="top"><tt>ParamObj</tt> </td>
        <td valign="top">The type of object used to specify the
        postfix parameters to the <font size="2"
        face="Courier New">DBView</font>.</td>
        <td valign="top"><font size="2" face="Courier New">DefaultParamObj&lt;DataObj&gt;</font>&nbsp;
        </td>
    </tr>
</TBODY></table>

<p>&nbsp;</p>

<h3>Notation</h3>

<table border="0">
    <tr>
        <td valign="top"><tt>X</tt> </td>
        <td valign="top">A type that is a model of <font size="2"
        face="Courier New">AlwaysThrowsHandler</font></td>
    </tr>
    <tr>
        <td valign="top"><tt>a</tt> </td>
        <td valign="top">Object of type <tt>X</tt> </td>
    </tr>
</table>

<h3>Expression semantics</h3>

<table border="1">
    <tr>
        <th>Name </th>
        <th>Expression </th>
        <th>Precondition </th>
        <th>Semantics </th>
        <th>Postcondition </th>
    </tr>
    <tr>
        <td valign="top">Default constructor </td>
        <td valign="top"><pre>X a()</pre>
        </td>
        <td valign="top">&nbsp; </td>
        <td valign="top">Construct the function object.</td>
        <td valign="top">&nbsp;</td>
    </tr>
    <tr>
        <td valign="top">Copy constructor </td>
        <td valign="top"><pre>X a(constX &amp;b)</pre>
        </td>
        <td valign="top">&nbsp; </td>
        <td valign="top">Copy construct the <font size="2"
        face="Courier New">AlwaysThrowsHandler</font>.</td>
        <td valign="top">&nbsp;</td>
    </tr>
    <tr>
        <td>Assignment Operator</td>
        <td><font size="2" face="Courier New">X operator=(const X
        &amp;b)</font></td>
        <td>&nbsp;</td>
        <td>Assign the <font size="2" face="Courier New">AlwaysThrowsHandler</font>.</td>
        <td>&nbsp;</td>
    </tr>
    <tr>
        <td valign="top">Throw exception operator</td>
        <td valign="top"><pre>dtl_ios_base::MeansOfRecovery operator()(RootException &amp;ex, dtl_ios_base &amp;base, DataObj &amp;data, ParamObj &amp;params)</pre>
        </td>
        <td valign="top">&nbsp; </td>
        <td valign="top">This operator takes references to the
        thrown <font size="2" face="Courier New">RootException</font>
        object, the <font size="2" face="Courier New">dtl_ios_base</font>
        (iterator) which threw, and the <font size="2"
        face="Courier New">DataObj </font>and <font size="2"
        face="Courier New">ParamObj </font>relevant to the
        exception. Tells the iterator to throw the exception (<font
        size="2" face="Courier New">dtl_ios_base::THROW_EXCEPTION</font>).
        </td>
        <td valign="top">&nbsp;</td>
    </tr>
</table>

<p>&nbsp;</p>

<h3>See also</h3>

<p><a href="LoggingHandler.htm"><font size="2" face="Courier New">LoggingHandler</font></a><font
size="2" face="Courier New">, </font><a href="IOHandler.htm"><font
size="2" face="Courier New">IOHandler</font></a><font size="2"
face="Courier New">, </font><a href="DBView.htm"><font size="2"
face="Courier New">DBView</font></a><font size="2"
face="Courier New">, </font><a href="IndexedDBView.htm"><font
size="2" face="Courier New">IndexedDBView</font></a><a
href="IndexedDBView.htm"><font size="2"><!--start footer--></font></a></p>

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