1/*=============================================================================
2 Copyright (c) 2001-2014 Joel de Guzman
3
4 Distributed under the Boost Software License, Version 1.0. (See accompanying
5 file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
6=============================================================================*/
7#if !defined(BOOST_SPIRIT_X3_CALL_CONTEXT_MAY_26_2014_0234PM)
8#define BOOST_SPIRIT_X3_CALL_CONTEXT_MAY_26_2014_0234PM
9
10#include <type_traits>
11
12#include <boost/spirit/home/x3/support/context.hpp>
13#include <boost/spirit/home/x3/support/utility/is_callable.hpp>
14#include <boost/range/iterator_range_core.hpp>
15
16namespace boost { namespace spirit { namespace x3
17{
18 ////////////////////////////////////////////////////////////////////////////
19 struct rule_val_context_tag;
20
21 template <typename Context>
22 inline decltype(auto) _val(Context const& context)
23 {
24 return x3::get<rule_val_context_tag>(context);
25 }
26
27 ////////////////////////////////////////////////////////////////////////////
28 struct where_context_tag;
29
30 template <typename Context>
31 inline decltype(auto) _where(Context const& context)
32 {
33 return x3::get<where_context_tag>(context);
34 }
35
36 ////////////////////////////////////////////////////////////////////////////
37 struct attr_context_tag;
38
39 template <typename Context>
40 inline decltype(auto) _attr(Context const& context)
41 {
42 return x3::get<attr_context_tag>(context);
43 }
44
45 ////////////////////////////////////////////////////////////////////////////
46 namespace detail
47 {
48 template <typename F, typename Context>
49 auto call(F f, Context const& context, mpl::true_)
50 {
51 return f(context);
52 }
53
54 template <typename F, typename Context>
55 auto call(F f, Context const& /* context */, mpl::false_)
56 {
57 return f();
58 }
59 }
60
61 template <
62 typename F, typename Iterator
63 , typename Context, typename RuleContext, typename Attribute>
64 auto call(
65 F f, Iterator& first, Iterator const& last
66 , Context const& context, RuleContext& rcontext, Attribute& attr)
67 {
68 boost::iterator_range<Iterator> rng(first, last);
69 auto val_context = make_context<rule_val_context_tag>(rcontext, context);
70 auto where_context = make_context<where_context_tag>(rng, val_context);
71 auto attr_context = make_context<attr_context_tag>(attr, where_context);
72 return detail::call(f, attr_context, is_callable<F(decltype(attr_context) const&)>());
73 }
74}}}
75
76#endif
77

source code of boost/libs/spirit/include/boost/spirit/home/x3/core/call.hpp