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boost::proto::when<Grammar, R(A..., ...)>::impl
// In header: <boost/proto/transform/when.hpp> template<typename Expr, typename State, typename Data> struct impl : proto::transform_impl< Expr, State, Data > { // types typedef proto::call<R(A..., ...)> call_; // For exposition only typedef proto::make<R(A..., ...)> make_; // For exposition only typedef typename mpl::if_<proto::is_callable<R>,call_,make_>::type which; // For exposition only typedef typename boost::result_of<which(Expr, State, Data)>::type result_type; // public member functions result_type operator()(typename impl::expr_param, typename impl::state_param, typename impl::data_param) const; };
impl public member functionsresult_type operator()(typename impl::expr_param expr, typename impl::state_param state, typename impl::data_param data) const;
                  Evaluate R(A..., ...) as a transform either with
                  proto::call<>proto::make<>proto::is_callable<R>::valuetrue or false.
                
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