63e88f80
 Hu Chunming
提交三方库
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#ifndef BOOST_METAPARSE_V1_FOLDL_HPP
#define BOOST_METAPARSE_V1_FOLDL_HPP
// Copyright Abel Sinkovics (abel@sinkovics.hu) 2011.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#include <boost/metaparse/v1/accept.hpp>
#include <boost/metaparse/v1/is_error.hpp>
#include <boost/metaparse/v1/get_position.hpp>
#include <boost/metaparse/v1/get_result.hpp>
#include <boost/metaparse/v1/get_remaining.hpp>
#include <boost/mpl/eval_if.hpp>
namespace boost
{
namespace metaparse
{
namespace v1
{
template <class P, class State, class ForwardOp>
struct foldl
{
private:
template <class Res>
struct apply_unchecked :
// foldl never returns error
// I need to use apply_wrap, and not apply, because apply would
// build a metafunction class from foldl<P, State, ForwardOp>
// when ForwardOp is a lambda expression.
foldl<
P,
typename ForwardOp::template apply<
typename State::type,
typename get_result<Res>::type
>,
ForwardOp
>::template apply<
typename get_remaining<Res>::type,
typename get_position<Res>::type
>
{};
template <class S, class Pos>
struct next_iteration : accept<typename State::type, S, Pos> {};
public:
typedef foldl type;
template <class S, class Pos>
struct apply :
boost::mpl::eval_if<
typename is_error<typename P::template apply<S, Pos> >::type,
next_iteration<S, Pos>,
apply_unchecked<typename P::template apply<S, Pos> >
>
{};
};
}
}
}
#endif
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