1/*=============================================================================
2 Copyright (c) 2001-2011 Joel de Guzman
3 http://spirit.sourceforge.net/
4
5 Distributed under the Boost Software License, Version 1.0. (See accompanying
6 file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
7=============================================================================*/
8#ifndef BOOST_SPIRIT_MAKE_CONS_OCTOBER_16_2008_1252PM
9#define BOOST_SPIRIT_MAKE_CONS_OCTOBER_16_2008_1252PM
10
11#if defined(_MSC_VER)
12#pragma once
13#endif
14
15#include <boost/mpl/eval_if.hpp>
16#include <boost/fusion/include/cons.hpp>
17#include <boost/type_traits/remove_const.hpp>
18#include <boost/type_traits/is_abstract.hpp>
19#include <boost/type_traits/is_function.hpp>
20#include <boost/type_traits/add_reference.hpp>
21#include <boost/utility/enable_if.hpp>
22
23namespace boost { namespace spirit { namespace detail
24{
25 template <typename T>
26 struct as_meta_element
27 : mpl::eval_if_c<is_abstract<T>::value || is_function<T>::value
28 , add_reference<T>, remove_const<T> >
29 {};
30
31 template <typename T>
32 struct as_meta_element<T&> : as_meta_element<T> // always store by value
33 {};
34
35 template <typename T, int N>
36 struct as_meta_element<T[N]>
37 {
38 typedef const T(&type)[N];
39 };
40
41 namespace result_of
42 {
43 template <typename Car, typename Cdr = fusion::nil_>
44 struct make_cons
45 {
46 typedef typename as_meta_element<Car>::type car_type; typedef typename fusion::cons<car_type, Cdr> type;
47 };
48 }
49
50 template <typename Car, typename Cdr>
51 fusion::cons<typename as_meta_element<Car>::type, Cdr>
52 make_cons(Car const& car, Cdr const& cdr)
53 {
54 typedef typename as_meta_element<Car>::type car_type;
55 typedef typename fusion::cons<car_type, Cdr> result;
56 return result(car, cdr);
57 }
58
59 template <typename Car>
60 fusion::cons<typename as_meta_element<Car>::type>
61 make_cons(Car const& car)
62 {
63 typedef typename as_meta_element<Car>::type car_type;
64 typedef typename fusion::cons<car_type> result;
65 return result(car);
66 }
67
68#if defined(__GNUC__) && (__GNUC__ == 4) && (__GNUC_MINOR__ == 0)
69 // workaround for gcc-4.0 bug where illegal function types
70 // can be formed (const is added to function type)
71 // description: http://lists.boost.org/Archives/boost/2009/04/150743.php
72 template <typename Car>
73 fusion::cons<typename as_meta_element<Car>::type>
74 make_cons(Car& car, typename enable_if<is_function<Car> >::type* = 0)
75 {
76 typedef typename as_meta_element<Car>::type car_type;
77 typedef typename fusion::cons<car_type> result;
78 return result(car);
79 }
80#endif
81}}}
82
83#endif
84