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Nope <code>move</code> doesn't take an rvalue-reference, it takes what has been dubbed a universal reference by the community. Template parameters being type-deduced behave according to the rules of reference collapsing. This means: <ul> <li>if <code>T</code> is <code>K</code>, then <code>T&&</code> will simply be <code>K&&</code>;</li> <li>if <code>T</code> is <code>K&</code>, then <code>T&&</code> will collapse to <code>K&</code>;</li> <li>if <code>T</code> is <code>K&&</code>, then <code>T&&</code> will collapse to <code>T&&</code>.</li> </ul> It's like a logical-AND of the <code>&</code> and the <code>&&</code> where <code>&</code> is 0 and <code>&&</code> is 1: <pre><code> & && |-----------| & | & | & | |-----|-----| && | & | && | |-----------| </code></pre> And that's how <code>move</code> works for both rvalues and lvalues. Examples: <pre><code>template<typename T> void f(T&&); f<int> // T is int; plugging int into T makes int&& which is just int&& f<int&> // T is int&; plugging int& into T is int& && which collapse to int& f<int&&> // T is int&&; plugging int&& into T is int&& && which collapse to int&& </code></pre> Note that reference collapsing only happens with template parameters; you can't directly type <code>int&& &&</code> and expect it to compile. Of course, you don't specify types manually like that. Those are just to show what references collapse to. So you'd really call it like this: <pre><code>int i; f(i); // T is int&; int& && collapses to int& f(4); // T is int&&; int&& && collapses to int&& </code></pre> Reference collapsing is also the reason why <code>move</code> doesn't return a <code>T&&</code>: the references would collapse if <code>T</code> were an lvalue reference and make <code>move</code> just return an lvalue reference. You do <code>remove_reference</code> to get to a non-reference type so that the <code>&&</code> will really mean "rvalue-reference". You can learn more here: <a href="http://isocpp.org/blog/2012/11/universal-references-in-c11-scott-meyers" rel="nofollow">http://isocpp.org/blog/2012/11/universal-references-in-c11-scott-meyers</a>
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1. USSeth Carnegie
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