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site_set_base.hh
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26 
27 #ifndef MLN_CORE_INTERNAL_SITE_SET_BASE_HH
28 # define MLN_CORE_INTERNAL_SITE_SET_BASE_HH
29 
34 
35 # include <mln/core/concept/site_set.hh>
36 # include <mln/core/concept/site_proxy.hh>
37 
38 
39 namespace mln
40 {
41 
42  namespace internal
43  {
44 
45 
54  template <typename P, typename E>
55  struct site_set_base_ : public Site_Set<E>
56  {
58  typedef typename subject<P>::ret site;
59 
63  bool is_empty() const;
64 
65  protected:
67 
68  private:
69  // Default impl based on the number of sites. It can be
70  // overridden in subclasses that do not feature the 'nsites'
71  // method.
72  bool is_empty_() const;
73  };
74 
75 
76 # ifndef MLN_INCLUDE_ONLY
77 
78  template <typename P, typename E>
79  inline
81  {
82  }
83 
84  template <typename P, typename E>
85  inline
86  bool
88  {
89  return exact(this)->is_empty_();
90  }
91 
92  template <typename P, typename E>
93  inline
94  bool
95  site_set_base_<P,E>::is_empty_() const
96  {
97  mlc_is(mln_trait_site_set_nsites(E),
98  trait::site_set::nsites::known)::check();
99  return exact(this)->nsites() == 0;
100  }
101 
102 # endif // ! MLN_INCLUDE_ONLY
103 
104  } // end of namespace mln::internal
105 
106 } // end of namespace mln
107 
108 
109 #endif // ! MLN_CORE_INTERNAL_SITE_SET_BASE_HH