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boost::proto::nullary_expr — A metafunction for generating nullary expression types, a grammar element for matching nullary expressions, and a PrimitiveTransform that returns the current expression unchanged.
// In header: <boost/proto/traits.hpp> template<typename Tag, typename T> struct nullary_expr : proto::transform< { // types typedef proto::expr< proto::term< ; typedef proto::basic_expr< proto::term< ; // member classes/structs/unions template<typename Expr, typename State, typename Data> struct impl : proto::transform_impl< { // types typedef ; // public member functions (, , ) ; }; };