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boost::proto::if_else_ — A metafunction for generating ternary conditional expression types, a grammar element for
matching ternary conditional expressions, and
a PrimitiveTransform
that dispatches to the
proto::pass_through<>
transform.
// In header: <boost/proto/traits.hpp> template<typename T, typename U, typename V> struct if_else_ : proto::transform< { // types typedef proto::expr< proto::tag::if_else_, proto::list3< ; typedef proto::basic_expr< proto::tag::if_else_, proto::list3< ; // member classes/structs/unions template<typename Expr, typename State, typename Data> struct impl : proto::pass_through<if_else_>::template impl<Expr, State, Data> { }; };