/src/lib/backtracking/low_level/abstract_backtracking_cut_point.e
http://github.com/tybor/Liberty · Specman e · 64 lines · 21 code · 6 blank · 37 comment · 0 complexity · 2093d1a959486ee7f46b93d949e37c65 MD5 · raw file
- -- This file is part of a Liberty Eiffel library.
- -- See the full copyright at the end.
- --
- class ABSTRACT_BACKTRACKING_CUT_POINT
- --
- -- Instances of that class are used by the ABSTRACT_BACKTRACKING
- -- to record "cut points" data. A cut point is an indication of
- -- up to which alternative are to be removed from the exploration.
- --
- -- Instances of that class are inserted in the continuation path
- -- to be retrieved by dynamic cast during calls to cut.
- --
- inherit
- ABSTRACT_BACKTRACKING_SEQUENCE
- rename pool as pool_of_cut_points
- end
- insert
- ABSTRACT_BACKTRACKING_GLOBALS
- feature {ABSTRACT_BACKTRACKING}
- top_alternative: ABSTRACT_BACKTRACKING_ALTERNATIVE
- -- Record of what top of the stack of alternative
- -- is to restore when cut is called.
- -- Managed by ABSTRACT_BACKTRACKING.
- set_top_alternative (value: like top_alternative)
- do
- top_alternative := value
- ensure
- definition: top_alternative = value
- end
- next_sequence (explorer: ABSTRACT_BACKTRACKING)
- -- Do nothing: remove itself (as if it were the end
- -- of a sequence) and evaluate the continuation by
- -- issuing a 'continue'.
- do
- explorer.pop_sequence
- explorer.continue
- end
- end -- class ABSTRACT_BACKTRACKING_CUT_POINT
- --
- -- Copyright (C) 2009-2017: by all the people cited in the AUTHORS file.
- --
- -- Permission is hereby granted, free of charge, to any person obtaining a copy
- -- of this software and associated documentation files (the "Software"), to deal
- -- in the Software without restriction, including without limitation the rights
- -- to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- -- copies of the Software, and to permit persons to whom the Software is
- -- furnished to do so, subject to the following conditions:
- --
- -- The above copyright notice and this permission notice shall be included in
- -- all copies or substantial portions of the Software.
- --
- -- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- -- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- -- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- -- AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- -- LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- -- OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- -- THE SOFTWARE.