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boost::proto::fold::impl
// In header: <boost/proto/transform/fold.hpp>
template<typename Expr, typename State, typename Data>
struct impl : proto::transform_impl< Expr, State, Data > {
// types
typedef when<_, Sequence> X; // For exposition only
typedef when<_, State0> Y; // For exposition only
typedef typename boost::result_of<X(Expr, State, Data)>::type seq; // A Fusion sequence, for exposition only
typedef typename boost::result_of<Y(Expr, State, Data)>::type state0; // An initial state for the fold, for exposition only
typedef unspecified fun; // fun(d)(s,e) == when<_,Fun>()(e,s,d)
typedef typename fusion::result_of::fold<seq, state0, fun>::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;
Let seq be
when<_, Sequence>()(expr, state, data)state0 be
when<_, State0>()(expr, state, data)fun(data) be an object such that
fun(data)(state, expr) is equivalent to
when<_, Fun>()(expr, state, data)fusion::fold(seq, state0, fun(data)).
Parameters: |
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