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.