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<a name="Arithmetic-on-poly_005fints"></a>
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Next: <a href="Alignment-of-poly_005fints.html#Alignment-of-poly_005fints" accesskey="n" rel="next">Alignment of <code>poly_int</code>s</a>, Previous: <a href="Comparisons-involving-poly_005fint.html#Comparisons-involving-poly_005fint" accesskey="p" rel="prev">Comparisons involving <code>poly_int</code></a>, Up: <a href="poly_005fint.html#poly_005fint" accesskey="u" rel="up">poly_int</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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<a name="Arithmetic-on-poly_005fints-1"></a>
<h3 class="section">10.4 Arithmetic on <code>poly_int</code>s</h3>

<p>Addition, subtraction, negation and bit inversion all work normally for
<code>poly_int</code>s.  Multiplication by a constant multiplier and left
shifting by a constant shift amount also work normally.  General
multiplication of two <code>poly_int</code>s is not supported and is not
useful in practice.
</p>
<p>Other operations are only conditionally supported: the operation
might succeed or might fail, depending on the inputs.
</p>
<p>This section describes both types of operation.
</p>
<table class="menu" border="0" cellspacing="0">
<tr><td align="left" valign="top">&bull; <a href="Using-poly_005fint-with-C_002b_002b-arithmetic-operators.html#Using-poly_005fint-with-C_002b_002b-arithmetic-operators" accesskey="1">Using <code>poly_int</code> with C++ arithmetic operators</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="wi-arithmetic-on-poly_005fints.html#wi-arithmetic-on-poly_005fints" accesskey="2"><code>wi</code> arithmetic on <code>poly_int</code>s</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Division-of-poly_005fints.html#Division-of-poly_005fints" accesskey="3">Division of <code>poly_int</code>s</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Other-poly_005fint-arithmetic.html#Other-poly_005fint-arithmetic" accesskey="4">Other <code>poly_int</code> arithmetic</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
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