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    <p><strong>EDIT</strong>: using c++14, the best solution is very easy to write thanks to lambdas that can now have parameters of type <code>auto</code>. <strong>This is my current favorite solution</strong></p> <pre><code>std::sort(v.begin(), v.end(), [](auto &amp;left, auto &amp;right) { return left.second &lt; right.second; }); </code></pre> <hr> <p>Just use a custom comparator (it's an optional 3rd argument to <code>std::sort</code>)</p> <pre><code>struct sort_pred { bool operator()(const std::pair&lt;int,int&gt; &amp;left, const std::pair&lt;int,int&gt; &amp;right) { return left.second &lt; right.second; } }; std::sort(v.begin(), v.end(), sort_pred()); </code></pre> <p>If you're using a C++11 compiler, you can write the same using lambdas:</p> <pre><code>std::sort(v.begin(), v.end(), [](const std::pair&lt;int,int&gt; &amp;left, const std::pair&lt;int,int&gt; &amp;right) { return left.second &lt; right.second; }); </code></pre> <p><strong>EDIT</strong>: in response to your edits to your question, here's some thoughts ... if you <strong>really</strong> wanna be creative and be able to reuse this concept a lot, just make a template:</p> <pre><code>template &lt;class T1, class T2, class Pred = std::less&lt;T2&gt; &gt; struct sort_pair_second { bool operator()(const std::pair&lt;T1,T2&gt;&amp;left, const std::pair&lt;T1,T2&gt;&amp;right) { Pred p; return p(left.second, right.second); } }; </code></pre> <p>then you can do this too:</p> <pre><code>std::sort(v.begin(), v.end(), sort_pair_second&lt;int, int&gt;()); </code></pre> <p>or even</p> <pre><code>std::sort(v.begin(), v.end(), sort_pair_second&lt;int, int, std::greater&lt;int&gt; &gt;()); </code></pre> <p>Though to be honest, this is all a bit overkill, just write the 3 line function and be done with it :-P</p>
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    1. CO+1 for the use of standard STL and not Boost!
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