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one.hh
1 // Copyright (C) 2007, 2008, 2009, 2011 EPITA Research and Development
2 // Laboratory (LRDE)
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20 // instantiate templates or use macros or inline functions from this
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26 
27 #ifndef MLN_LITERAL_ONE_HH
28 # define MLN_LITERAL_ONE_HH
29 
33 
34 # include <mln/core/concept/literal.hh>
35 # include <mln/metal/converts_to.hh>
36 
37 
38 namespace mln
39 {
40 
41  namespace literal
42  {
43 
45  struct one_t : public Literal<one_t>
46  {
47  // This default constructor is needed for compilation with gcc
48  // 4.6.0, gcc 4.6.1 and Clang.
49  one_t();
50 
51  // FIXME: Cf. comments in literal/zero.hh.
52 
53  template <typename T>
54  operator const T () const;
55  };
56 
57 
59  extern const one_t one;
60 
61 
62 # ifndef MLN_INCLUDE_ONLY
63 
64  inline
65  one_t::one_t()
66  {
67  }
68 
69  template <typename T>
70  inline
71  one_t::operator const T () const
72  {
73  mlc_converts_to(int, T)::check();
74  return 1;
75  }
76 
77 # ifndef MLN_WO_GLOBAL_VARS
78 
79  const one_t one;
80 
81 # endif // !MLN_WO_GLOBAL_VARS
82 
83 # endif // ! MLN_INCLUDE_ONLY
84 
85  } // end of namespace mln::literal
86 
87 } // end of namespace mln
88 
89 
90 #endif // ! MLN_LITERAL_ONE_HH