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is.hh
1 // Copyright (C) 2007, 2008, 2009 EPITA Research and Development Laboratory (LRDE)
2 //
3 // This file is part of Olena.
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25 
26 #ifndef MLN_METAL_IS_HH
27 # define MLN_METAL_IS_HH
28 
32 
33 # include <mln/metal/is_a.hh>
34 
35 
36 # define mlc_is(T, U) mln::metal::is< T, U >
37 
38 
39 
40 namespace mln
41 {
42 
43  namespace metal
44  {
45 
46  namespace internal
47  {
48 
49  template <typename T, typename U>
50  struct helper_is_
51  {
52  static yes_ selector(U*const);
53  static no_ selector(...);
54  };
55 
56  } // end of namespace mln::metal::internal
57 
58 
59 
62  //
63  template <typename T, typename U>
64  struct is : bool_<( sizeof(internal::helper_is_<T, U>::selector(internal::make_<T>::ptr()))
65  ==
66  sizeof(internal::yes_) )>
67  {
68  };
69 
70  template <typename T, typename U>
71  struct is< const T, const U > : is<T, U>::eval
72  {};
73 
74  template <typename T, typename U>
75  struct is< T*, U* > : is<T, U>::eval
76  {};
77 
78  template <typename T, typename U>
79  struct is< T&, U& > : is<T, U>::eval
80  {};
81 
82  template <typename T, typename U>
83  struct is< T**, U** > : false_
84  {};
85 
86  } // end of namespace mln::metal
87 
88 } // end of namespace mln
89 
90 
91 #endif // ! MLN_METAL_IS_HH