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boost::swap
// In header: <boost/variant/variant.hpp> template<typename T1, typename T2, ..., typename TN> void swap(variant<T1, T2, ..., TN> & lhs, variant<T1, T2, ..., TN> & rhs);
| Effects: | Swaps lhswithrhsby application
          ofvariant::swap. | 
| Throws: | May fail with any exception arising from variant::swap. |