/*============================================================================= | |
Copyright (c) 2001-2011 Hartmut Kaiser | |
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) | |
==============================================================================*/ | |
#if !defined(BOOST_SPIRIT_HANDLES_CONTAINER_DEC_18_2010_0920AM) | |
#define BOOST_SPIRIT_HANDLES_CONTAINER_DEC_18_2010_0920AM | |
#if defined(_MSC_VER) | |
#pragma once | |
#endif | |
#include <boost/spirit/home/support/attributes_fwd.hpp> | |
#include <boost/mpl/bool.hpp> | |
#include <boost/mpl/or.hpp> | |
#include <boost/mpl/not.hpp> | |
#include <boost/mpl/find_if.hpp> | |
#include <boost/type_traits/is_same.hpp> | |
namespace boost { namespace spirit { namespace traits | |
{ | |
// Finds out whether a component handles container attributes intrinsically | |
// (or whether container attributes need to be split up separately). | |
template <typename T, typename Attribute, typename Context | |
, typename Iterator, typename Enable> | |
struct handles_container : mpl::false_ {}; | |
template <typename Subject, typename Attribute, typename Context | |
, typename Iterator> | |
struct unary_handles_container | |
: handles_container<Subject, Attribute, Context, Iterator> {}; | |
template <typename Left, typename Right, typename Attribute | |
, typename Context, typename Iterator> | |
struct binary_handles_container | |
: mpl::or_< | |
handles_container<Left, Attribute, Context, Iterator> | |
, handles_container<Right, Attribute, Context, Iterator> > | |
{}; | |
template <typename Elements, typename Attribute, typename Context | |
, typename Iterator> | |
struct nary_handles_container | |
: mpl::not_< | |
is_same< | |
typename mpl::find_if< | |
Elements, handles_container<mpl::_, Attribute | |
, Context, Iterator> | |
>::type | |
, typename mpl::end<Elements>::type> > | |
{}; | |
}}} | |
#endif |