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value/cast.hh
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25 
26 #ifndef MLN_VALUE_CAST_HH
27 # define MLN_VALUE_CAST_HH
28 
34 # include <mln/core/concept/value.hh>
35 # include <mln/value/equiv.hh>
36 
37 
38 namespace mln
39 {
40 
41  namespace value
42  {
43 
44 
46  template <typename Dest, typename Src>
47  Dest cast(const Src& src);
48 
49 
50 
51 # ifndef MLN_INCLUDE_ONLY
52 
53  namespace internal
54  {
55 
56  template <typename S>
57  inline
58  const S&
59  cast_(const void*, const S& src)
60  {
61  return src;
62  }
63 
64  template <typename O, typename S>
65  inline
66  const S&
67  cast_(const Object<O>*, const S& src)
68  {
69  return src;
70  }
71 
72  template <typename V, typename S>
73  inline
74  mln_value_equiv(S)
75  cast_(const Value<V>*, const S& src)
76  {
77  return mln::value::equiv(src);
78  }
79 
80  } // end of namespace mln::value::internal
81 
82 
83  template <typename Dest, typename Src>
84  inline
85  Dest cast(const Src& src)
86  {
87  // FIXME: Add static_cast<Dest>?
88  // FIXME: Add exact()?
89  return static_cast<Dest>(internal::cast_(&src, src));
90  }
91 
92 # endif // ! MLN_INCLUDE_ONLY
93 
94  } // end of namespace mln::value
95 
96 } // end of namespace mln
97 
98 
99 #endif // ! MLN_VALUE_CAST_HH