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/Src/Dependencies/Boost/boost/spirit/home/phoenix/core/composite.hpp

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 1/*=============================================================================
 2    Copyright (c) 2001-2007 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#ifndef PHOENIX_CORE_COMPOSITE_HPP
 8#define PHOENIX_CORE_COMPOSITE_HPP
 9
10#include <boost/spirit/home/phoenix/core/actor.hpp>
11#include <boost/spirit/home/phoenix/core/is_actor.hpp>
12#include <boost/fusion/include/vector.hpp>
13#include <boost/fusion/include/at.hpp>
14#include <boost/fusion/include/size.hpp>
15#include <boost/fusion/include/mpl.hpp>
16#include <boost/mpl/fold.hpp>
17#include <boost/mpl/bool.hpp>
18#include <boost/mpl/or.hpp>
19
20namespace boost { namespace phoenix
21{
22    namespace detail
23    {
24        template <int N>
25        struct composite_eval;
26        
27        struct compute_no_nullary
28        {
29            template <typename State, typename T>
30            struct apply
31            {
32                typedef typename 
33                    mpl::or_<typename T::no_nullary, State>::type
34                type;
35            };
36        };
37    }
38
39    template <typename EvalPolicy, typename EvalTuple>
40    struct composite : EvalTuple
41    {
42        typedef EvalTuple base_type;
43        typedef composite<EvalPolicy, EvalTuple> self_type;
44        typedef EvalPolicy eval_policy_type;
45        
46        typedef typename
47            mpl::fold<
48                EvalTuple
49              , mpl::false_
50              , detail::compute_no_nullary
51            >::type
52        no_nullary;
53
54        template <typename Env>
55        struct result
56        {
57            typedef
58                typename detail::composite_eval<
59                    fusion::result_of::size<base_type>::value>::
60                template result<self_type, Env>::type
61            type;
62        };
63
64        composite()
65            : base_type() {}
66
67        composite(base_type const& base)
68            : base_type(base) {}
69
70        template <typename U0>
71        composite(U0& _0)
72            : base_type(_0) {}
73
74        template <typename U0, typename U1>
75        composite(U0& _0, U1& _1)
76            : base_type(_0, _1) {}
77
78        template <typename Env>
79        typename result<Env>::type
80        eval(Env const& env) const
81        {
82            typedef typename result<Env>::type return_type;
83            return detail::
84                composite_eval<fusion::result_of::size<base_type>::value>::template
85                    call<return_type>(*this, env);
86        }
87
88        //  Bring in the rest of the constructors
89        #include <boost/spirit/home/phoenix/core/detail/composite.hpp>
90    };
91
92    //  Bring in the detail::composite_eval<0..N> definitions
93    #include <boost/spirit/home/phoenix/core/detail/composite_eval.hpp>
94}}
95
96#endif