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/* Copyright (C) 2006, 2007 William McCune
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This file is part of the LADR Deduction Library.
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The LADR Deduction Library is free software; you can redistribute it
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and/or modify it under the terms of the GNU General Public License,
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The LADR Deduction Library is distributed in the hope that it will be
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useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with the LADR Deduction Library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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This is a simple package that can be used when you need a pair
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of indexes (Mindexes), one for positive literals, and one for negative
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literals. The name Lindex means "literal index".
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When you allocate the Lindex (lindex_init()), you
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specify the parameters as you would for two separate Mindexes.
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When you insert into or delete from the Lindex, you give a clause,
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and each literal of the clause is indexed: positive literals
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go into the positive component of the Lindex, and negative literals
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go into the negative component.
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There are no retrieval operations in this package. Instead, use
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the retrieval operations from the Mindex package on the appropriate
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member (positive or negative) of the pair.
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See the package "mindex" for information on the initialization
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parameters and retrieval operations.
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/* Public definitions */
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typedef struct lindex * Lindex;
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Mindex pos; /* index for positive literals */
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Mindex neg; /* index for negative literals */
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Lindex next; /* for avail list */
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/* End of public definitions */
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/* Public function prototypes from lindex.c */
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void fprint_lindex_mem(FILE *fp, BOOL heading);
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Lindex lindex_init(Mindextype pos_mtype, Uniftype pos_utype, int pos_fpa_depth,
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Mindextype neg_mtype, Uniftype neg_utype, int neg_fpa_depth);
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void lindex_destroy(Lindex ldx);
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void lindex_update(Lindex ldx, Topform c, Indexop op);
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void lindex_update_first(Lindex ldx, Topform c, Indexop op);
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BOOL lindex_empty(Lindex idx);
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BOOL lindex_backtrack(Lindex idx);
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#endif /* conditional compilation of whole file */
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ladr/lindex.h.bak
