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boost::proto::_child_c — A PrimitiveTransform that returns N-th child of the current expression.
// In header: <boost/proto/transform/arg.hpp> template< N> struct _child_c : proto::transform< { // member classes/structs/unions template<typename Expr, typename State, typename Data> struct impl : proto::transform_impl< { // types typedef proto::result_of::child_c< ; // public member functions proto::result_of::child_c< (, , ) ; }; };