| 1 | /* GLIB - Library of useful routines for C programming |
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| 2 | * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald |
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| 3 | * |
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| 4 | * This library is free software; you can redistribute it and/or |
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| 5 | * modify it under the terms of the GNU Lesser General Public |
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| 6 | * License as published by the Free Software Foundation; either |
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| 7 | * version 2 of the License, or (at your option) any later version. |
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| 8 | * |
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| 9 | * This library is distributed in the hope that it will be useful, |
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| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 12 | * Lesser General Public License for more details. |
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| 13 | * |
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| 14 | * You should have received a copy of the GNU Lesser General Public |
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| 15 | * License along with this library; if not, write to the |
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| 16 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
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| 17 | * Boston, MA 02111-1307, USA. |
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| 18 | */ |
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| 19 | |
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| 20 | /* |
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| 21 | * Modified by the GLib Team and others 1997-2000. See the AUTHORS |
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| 22 | * file for a list of people on the GLib Team. See the ChangeLog |
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| 23 | * files for a list of changes. These files are distributed with |
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| 24 | * GLib at ftp://ftp.gtk.org/pub/gtk/. |
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| 25 | */ |
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| 26 | |
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| 27 | #ifndef __G_REL_H__ |
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| 28 | #define __G_REL_H__ |
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| 29 | |
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| 30 | #include <glib/gtypes.h> |
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| 31 | |
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| 32 | G_BEGIN_DECLS |
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| 33 | |
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| 34 | typedef struct _GRelation GRelation; |
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| 35 | typedef struct _GTuples GTuples; |
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| 36 | |
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| 37 | struct _GTuples |
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| 38 | { |
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| 39 | guint len; |
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| 40 | }; |
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| 41 | |
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| 42 | /* GRelation |
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| 43 | * |
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| 44 | * Indexed Relations. Imagine a really simple table in a |
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| 45 | * database. Relations are not ordered. This data type is meant for |
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| 46 | * maintaining a N-way mapping. |
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| 47 | * |
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| 48 | * g_relation_new() creates a relation with FIELDS fields |
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| 49 | * |
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| 50 | * g_relation_destroy() frees all resources |
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| 51 | * g_tuples_destroy() frees the result of g_relation_select() |
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| 52 | * |
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| 53 | * g_relation_index() indexes relation FIELD with the provided |
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| 54 | * equality and hash functions. this must be done before any |
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| 55 | * calls to insert are made. |
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| 56 | * |
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| 57 | * g_relation_insert() inserts a new tuple. you are expected to |
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| 58 | * provide the right number of fields. |
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| 59 | * |
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| 60 | * g_relation_delete() deletes all relations with KEY in FIELD |
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| 61 | * g_relation_select() returns ... |
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| 62 | * g_relation_count() counts ... |
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| 63 | */ |
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| 64 | |
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| 65 | GRelation* g_relation_new (gint fields); |
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| 66 | void g_relation_destroy (GRelation *relation); |
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| 67 | void g_relation_index (GRelation *relation, |
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| 68 | gint field, |
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| 69 | GHashFunc hash_func, |
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| 70 | GEqualFunc key_equal_func); |
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| 71 | void g_relation_insert (GRelation *relation, |
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| 72 | ...); |
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| 73 | gint g_relation_delete (GRelation *relation, |
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| 74 | gconstpointer key, |
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| 75 | gint field); |
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| 76 | GTuples* g_relation_select (GRelation *relation, |
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| 77 | gconstpointer key, |
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| 78 | gint field); |
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| 79 | gint g_relation_count (GRelation *relation, |
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| 80 | gconstpointer key, |
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| 81 | gint field); |
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| 82 | gboolean g_relation_exists (GRelation *relation, |
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| 83 | ...); |
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| 84 | void g_relation_print (GRelation *relation); |
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| 85 | |
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| 86 | void g_tuples_destroy (GTuples *tuples); |
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| 87 | gpointer g_tuples_index (GTuples *tuples, |
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| 88 | gint index_, |
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| 89 | gint field); |
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| 90 | |
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| 91 | G_END_DECLS |
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| 92 | |
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| 93 | #endif /* __G_REL_H__ */ |
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| 94 | |
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