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Looking at Boost::Optional optional class template header I come across this:

T const& operator*() const&
T&       operator*() &;
T&&      operator*() &&;

For the life of me I can't find this syntax anywhere else (a reference as the last symbol) I would assume it has something to do with overloading on the type(const l-val, l-val, r-val) of the object the operator belongs to, but I haven't seen this described anywhere.

Could someone tell me what this syntax means?

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    consider it applied to the type of *this for overload resolution on the hidden this parameter Commented Sep 7, 2016 at 1:51
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