/src/lib/backtracking/internal/abstract_backtracking_poolable.e

 1-- This file is part of a Liberty Eiffel library.
 2-- See the full copyright at the end.
 3--
 4deferred class ABSTRACT_BACKTRACKING_POOLABLE
 5   --
 6   -- Alternatives and sequences MUST be managed in a pool.
 7   -- The ability to be in a pool is declared in that class.
 8   --
 9
10feature {ANY}
11   release
12         -- Called by ABSTRACT_BACKTRACKING to release
13         -- current instance to the pool.
14      require
15         pool /= Void
16      do
17         pool.release_instance(Current)
18      end
19
20   get_twin: like Current
21         -- Return a twin of current from the pool
22      require
23         pool /= Void
24      do
25         Result := pool.get_instance
26         Result.copy(Current)
27      ensure
28         Result.is_equal(Current)
29      end
30
31   pool: ABSTRACT_BACKTRACKING_POOL[like Current]
32         -- The pool that will record Current
33      deferred
34      end
35
36feature {ABSTRACT_BACKTRACKING_POOL}
37   pool_link: ABSTRACT_BACKTRACKING_POOLABLE
38         -- Internal link used by the pool
39         -- to chain its poolable items.
40         -- Technical note: to give more freedom for
41         -- further usages of 'pool_link' it is not
42         -- defined with type anchorage.
43
44   set_pool_link (other: like pool_link)
45         -- Set 'pool_link' to 'other'
46      do
47         pool_link := other
48      ensure
49         definition: pool_link = other
50      end
51
52end -- class ABSTRACT_BACKTRACKING_POOLABLE
53--
54-- Copyright (C) 2009-2017: by all the people cited in the AUTHORS file.
55--
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60-- copies of the Software, and to permit persons to whom the Software is
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62--
63-- The above copyright notice and this permission notice shall be included in
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65--
66-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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