Function template swap

boost::swap —

Synopsis

template<typename T1, typename T2, ..., typename TN> 
  void swap(variant<T1, T2, ..., TN> & lhs, variant<T1, T2, ..., TN> & rhs);

Effects:	Swaps `lhs` with `rhs` by application of `variant::swap`.
Throws:	May fail with any exception arising from `variant::swap`.