[boost] any_cast improvement

[Unai Uribarri Rodríguez]

any_cast, as is implemented in boost 1.29, has one weakness; it doesn't allow to compile this piece of code:

any x=int(5);
++any_cast<int&>(x);

because any_cast tries to instanciate a pointer to int&. The attached patch solved this problem using boost::remove_reference from boost/type_traits.hpp.

any_cast<T&>(x) will return a reference to value contained in x if its type is T, or raise bad_cast otherwise.


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