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Struct template unary_plus

boost::proto::unary_plus — A metafunction for generating unary plus expression types, a grammar element for matching unary plus expressions, and a PrimitiveTransform that dispatches to the proto::pass_through<> transform.


// In header: <boost/proto/traits.hpp>

template<typename T> 
struct unary_plus :  proto::transform< unary_plus<T> > {
  // types
  typedef proto::expr< proto::tag::unary_plus, proto::list1< T > >       type;         
  typedef proto::basic_expr< proto::tag::unary_plus, proto::list1< T > > proto_grammar;

  // member classes/structs/unions
  template<typename Expr, typename State, typename Data> 
  struct impl :
     proto::pass_through<unary_plus>::template impl<Expr, State, Data>