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    <p>This is a fixed implementation, of what you had in your code:</p> <pre><code>template &lt;typename Container, typename Arg&gt; void move_x(Container&amp; c, Arg x) { typename Container::iterator it = find(c.begin(), c.end(), x); if (it!=c.end()) { c.erase(it); c.insert(c.end(), x); } } </code></pre> <p>One issue with your implementation is that <code>insert</code> anywhere <a href="http://www.cplusplus.com/reference/vector/vector/insert/" rel="nofollow noreferrer">but the end</a> can cause a reallocation and regardless will invalidate anything after the inserted position. So by definition since you are inserting at the beginning <code>it</code> will not be valid.</p> <p>The second issue is with <code>cout&lt;&lt;v[i];</code> it should actually be <code>cout&lt;&lt;i;</code>.</p> <p>A nicer implementation that uses reverse iterators and moves all <code>x</code>s. This one erases as it goes and keeps a <code>count</code> and then does <code>count</code> inserts when done. Using <a href="https://stackoverflow.com/questions/1830158/how-to-call-erase-with-a-reverse-iterator">erase with reverse iterators</a> is a little tricky:</p> <pre><code>template &lt;typename Container, typename Arg&gt; void move_all_x(Container&amp; c, Arg x) { unsigned int count = 0 ; for( typename Container::reverse_iterator it = c.rbegin() ; it != c.rend(); ) { if( *it == x ) { c.erase(--(it++).base() ) ; ++count ; } else { ++it ; } } for( unsigned int i = 0; i &lt; count; ++i ) { c.insert(c.begin(), x) ; } } </code></pre>
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