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1 /*=============================================================================
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2 Copyright (c) 2006-2007 Tobias Schwinger
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3
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4 Use modification and distribution are subject to the Boost Software
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5 License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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6 http://www.boost.org/LICENSE_1_0.txt).
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7 ==============================================================================*/
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8
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9 #if !defined(BOOST_FUSION_FUNCTIONAL_INVOCATION_DETAIL_THAT_PTR_HPP_INCLUDED)
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10 #define BOOST_FUSION_FUNCTIONAL_INVOCATION_DETAIL_THAT_PTR_HPP_INCLUDED
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11
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12 #include <boost/fusion/support/config.hpp>
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13 #include <boost/get_pointer.hpp>
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14 #include <boost/utility/addressof.hpp>
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15 #include <boost/type_traits/config.hpp>
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16 #include <boost/type_traits/remove_reference.hpp>
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17
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18 namespace boost { namespace fusion { namespace detail
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19 {
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20 template <typename Wanted>
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21 struct that_ptr
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22 {
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23 private:
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24
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25 typedef typename remove_reference<Wanted>::type pointee;
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26
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27 template <typename T>
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28 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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29 static inline pointee * do_get_pointer(T &, pointee * x)
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30 {
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31 return x;
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32 }
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33 template <typename T>
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34 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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35 static inline pointee * do_get_pointer(T & x, void const *)
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36 {
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37 return get_pointer(x);
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38 }
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39
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40 public:
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41
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42 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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43 static inline pointee * get(pointee * x)
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44 {
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45 return x;
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46 }
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47
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48 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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49 static inline pointee * get(pointee & x)
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50 {
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51 return boost::addressof(x);
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52 }
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53
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54 template <typename T>
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55 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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56 static inline pointee * get(T & x)
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57 {
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58 return do_get_pointer(x, boost::addressof(x));
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59 }
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60 };
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61
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62 template <typename PtrOrSmartPtr> struct non_const_pointee;
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63
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64 namespace adl_barrier
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65 {
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66 using boost::get_pointer;
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67 void const * BOOST_TT_DECL get_pointer(...); // fallback
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68
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69 template< typename T> char const_tester(T *);
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70 template< typename T> long const_tester(T const *);
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71
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72 template <typename Ptr>
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73 struct non_const_pointee_impl
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74 {
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75 static Ptr & what;
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76
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77 static bool const value =
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78 sizeof(const_tester(get_pointer(what))) == 1;
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79 };
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80 }
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81
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82 template <typename PtrOrSmartPtr> struct non_const_pointee
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83 : adl_barrier::non_const_pointee_impl<
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84 typename remove_cv<
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85 typename remove_reference<PtrOrSmartPtr>::type >::type >
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86 {
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87 typedef non_const_pointee type;
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88 typedef bool value_type;
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89 };
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90
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91 }}}
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92
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93 #endif
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94
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