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<div class="section">
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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
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<a name="safe_numerics.rationale"></a>Rationale</h2></div></div></div>
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<div class="qandaset">
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<a name="id754861"></a><dl>
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<dt>1. <a href="rationale.html#id754866">Why does a binary operation on two
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safe<int> values not necessarily return another
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safe type ?</a>
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</dt>
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<dt>2. <a href="rationale.html#id754917">Why is there no policy driven design for handling
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overflows</a>
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</dt>
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<dt>3. <a href="rationale.html#id754946">Why is Boost.Convert not used.</a>
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</dt>
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</dl>
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<table border="0" width="100%" summary="Q and A Set">
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<col align="left" width="1%">
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<col>
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<tbody>
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<tr class="question">
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<td align="left" valign="top">
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<a name="id754866"></a><a name="id754868"></a><p><b>1.</b></p>
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</td>
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<td align="left" valign="top"><p>Why does a binary operation on two
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<code class="computeroutput">safe<int></code> values not necessarily return another
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<code class="computeroutput">safe</code> type ?</p></td>
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</tr>
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<tr class="answer">
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<td align="left" valign="top"></td>
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<td align="left" valign="top">
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<p>There are a number of</p>
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<div class="itemizedlist"><ul class="itemizedlist" type="disc">
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<li class="listitem"><p>it was hard to implement.</p></li>
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<li class="listitem"><p>it doesn't really seem necessary. We always do SOMETHING
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with result of the operation. This will result in an assignment
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or a conversion to some other type where the result will be
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validated.</p></li>
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</ul></div>
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</td>
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</tr>
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<tr class="question">
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<td align="left" valign="top">
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<a name="id754917"></a><a name="id754920"></a><p><b>2.</b></p>
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</td>
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<td align="left" valign="top">
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<p>Why is there no policy driven design for handling
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overflows</p>
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<p>The question was - to which type does one apply it to?
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Consider the following example:</p>
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<pre class="programlisting">safe<int, overflow_policy_1> t1 = 2;
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safe<int, overflow_policy_2> t2 = 4;
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unsigned int x = t1 - t2; // which policy should be invoked?</pre>
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</td>
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</tr>
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<tr class="question">
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<td align="left" valign="top">
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<a name="id754946"></a><a name="id754948"></a><p><b>3.</b></p>
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</td>
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<td align="left" valign="top">
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<p>Why is Boost.Convert not used.</p>
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<p>I couldn't figure out how to use it from the
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documentation.</p>
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</td>
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</tr>
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</tbody>
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</table>
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<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="left"></td>
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<td align="right"><div class="copyright-footer">Copyright © 2012 Robert Ramey<p><a href="???" target="_top">Subject to Boost Software License</a></p>
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