| 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 | |
| 23 | namespace 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 | |