p.html" title="Class template map">map</a></code> using <code class="computeroutput">prior</code> as a hint to insert <code class="computeroutput">value_pair</code> after the position <code class="computeroutput">prior</code> is pointing to. </p>
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<pre class="literallayout"><a class="link" href="map.html" title="Class template map">map</a> <span class="special">&amp;</span> <a name="id673296-bb"></a><span class="identifier">subtract</span><span class="special">(</span><span class="keyword">const</