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-rw-r--r--cutl/container/key.hxx70
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diff --git a/cutl/container/key.hxx b/cutl/container/key.hxx
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-// file : cutl/container/key.hxx
-// license : MIT; see accompkeying LICENSE file
-
-#ifndef CUTL_CONTAINER_KEY_HXX
-#define CUTL_CONTAINER_KEY_HXX
-
-namespace cutl
-{
- namespace container
- {
- // A modifiable map key wrapper that can be used to implement multi-
- // index containers, as discussed in the following post:
- //
- // http://www.codesynthesis.com/~boris/blog/2012/09/11/emulating-boost-multi-index-with-std-containers/
- //
- template <class T1, class T2 = void, class T3 = void>
- struct key;
-
- template <class T1>
- struct key<T1, void, void>
- {
- mutable const T1* p1;
-
- key (): p1 (0) {}
- key (const T1& r1): p1 (&r1) {}
- void assign (const T1& r1) const {p1 = &r1;}
-
- bool operator< (const key& x) const {return *p1 < *x.p1;}
- };
-
- template <class T1, class T2>
- struct key<T1, T2, void>
- {
- mutable const T1* p1;
- mutable const T2* p2;
-
- key (): p1 (0), p2 (0) {}
- key (const T1& r1, const T2& r2): p1 (&r1), p2 (&r2) {}
- void assign (const T1& r1, const T2& r2) const {p1 = &r1; p2 = &r2;}
-
- bool operator< (const key& x) const
- {
- return *p1 < *x.p1 || (!(*x.p1 < *p1) && *p2 < *x.p2);
- }
- };
-
- template <class T1, class T2, class T3>
- struct key
- {
- mutable const T1* p1;
- mutable const T2* p2;
- mutable const T3* p3;
-
- key (): p1 (0), p2 (0), p3 (0) {}
- key (const T1& r1, const T2& r2, const T3& r3)
- : p1 (&r1), p2 (&r2) , p3 (&r3) {}
- void assign (const T1& r1, const T2& r2, const T3& r3) const
- {p1 = &r1; p2 = &r2; p3 = &r3;}
-
- bool operator< (const key& x) const
- {
- return (*p1 < *x.p1 ||
- (!(*x.p1 < *p1) && (*p2 < *x.p2 ||
- (!(*x.p2 < *p2) && *p3 < *x.p3))));
- }
- };
- }
-}
-
-#endif // CUTL_CONTAINER_KEY_HXX