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    <p>I ended up using a fallback namespace :</p> <pre><code>namespace operators_fallback { template &lt;typename T&gt; inline QDataStream&amp; operator&lt;&lt;(QDataStream&amp; s, const T &amp;) { return s; } template &lt;typename T&gt; inline QDataStream&amp; operator&gt;&gt;(QDataStream&amp; s, T &amp;) { return s; } template &lt;typename T&gt; inline QDebug operator&lt;&lt;(QDebug d, const T &amp;) { return d; } }; ... inline void load(QDataStream &amp; s) { using namespace operator_fallback; s &gt;&gt; item; } </code></pre> <p>Also found the proper way to check for operators at compile time (although I'm going with the fallback namespace).</p> <p>more or less based on <strong>this</strong> :</p> <pre><code>namespace private_impl { typedef char yes; typedef char (&amp;no)[2]; struct anyx { template &lt;class T&gt; anyx(const T &amp;); }; no operator &lt;&lt; (const anyx &amp;, const anyx &amp;); no operator &gt;&gt; (const anyx &amp;, const anyx &amp;); template &lt;class T&gt; yes check(T const&amp;); no check(no); template &lt;typename StreamType, typename T&gt; struct has_loading_support { static StreamType &amp; stream; static T &amp; x; static const bool value = sizeof(check(stream &gt;&gt; x)) == sizeof(yes); }; template &lt;typename StreamType, typename T&gt; struct has_saving_support { static StreamType &amp; stream; static T &amp; x; static const bool value = sizeof(check(stream &lt;&lt; x)) == sizeof(yes); }; template &lt;typename StreamType, typename T&gt; struct has_stream_operators { static const bool can_load = has_loading_support&lt;StreamType, T&gt;::value; static const bool can_save = has_saving_support&lt;StreamType, T&gt;::value; static const bool value = can_load &amp;&amp; can_save; }; } template&lt;typename T&gt; struct supports_qdatastream : private_impl::has_stream_operators&lt;QDataStream, T&gt; {}; template&lt;typename T&gt; struct can_load : private_impl::has_loading_support&lt;QDataStream, T&gt; {}; template&lt;typename T&gt; struct can_save : private_impl::has_saving_support&lt;QDataStream, T&gt; {}; template&lt;typename T&gt; struct can_debug : private_impl::has_saving_support&lt;QDebug, T&gt; {}; </code></pre> <p>//edit changed has_stream_operators a bit.</p> <p>//edit removed the link, apparently the site has some attack javascript.</p>
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    1. POIs it possible to use SFINAE/templates to check if an operator exists?
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    1. COIf an operator was already defined, won't it result in ambiguous overloading?
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    2. CONo, since it's a template, the "real" operator will be prefered.
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    3. COWhat if the "real" operator is also a template?
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