Struct template as_child
boost::proto::result_of::as_child — A metafunction that computes the return type of the
proto::as_child()
function.
Synopsis
Description
The proto::result_of::as_child<>
metafunction turns types into Proto types
if they are not already by making them Proto terminals held by reference. Types which are already Proto
types are left alone.
When T
is not yet a Proto type,
the result type proto::result_of::as_child<T, Domain>::type
is
boost::result_of<Domain(proto::expr< proto::tag::terminal, proto::term<T &> >)>::type
.
When T
is already a Proto type
The result type proto::result_of::as_child<T, Domain>::type
is
T &
.