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boost::proto::result_of::child_c — A metafunction that returns the type of the Nth
child of a Proto expression.
// In header: <boost/proto/traits.hpp>
template<typename Expr, long N>
struct child_c {
// types
typedef typename Expr::proto_child0 value_type;
typedef see-below type;
};
A metafunction that returns the type of the Nth
child of a Proto expression. N must be 0 or less than
Expr::proto_arity::value.
child_c
public
typestypedef typename Expr::proto_child0 value_type;
The raw type of the Nth child as it is stored
within Expr. This may be a value or a reference.
If Expr is not a reference type, type
is computed as follows:
T const & becomes T
T & becomes T
T becomes T
If Expr is a non-const reference type, type
is computed as follows:
T const & becomes T const &
T & becomes T &
T becomes T &
If Expr is a const reference type, type
is computed as follows:
T const & becomes T const &
T & becomes T &
T becomes T const &