1 ------------------------------------------------------------------------------
3 -- GNAT LIBRARY COMPONENTS --
5 -- ADA.CONTAINERS.RED_BLACK_TREES.GENERIC_OPERATIONS --
9 -- Copyright (C) 2004-2017, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
18 -- As a special exception under Section 7 of GPL version 3, you are granted --
19 -- additional permissions described in the GCC Runtime Library Exception, --
20 -- version 3.1, as published by the Free Software Foundation. --
22 -- You should have received a copy of the GNU General Public License and --
23 -- a copy of the GCC Runtime Library Exception along with this program; --
24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
25 -- <http://www.gnu.org/licenses/>. --
27 -- This unit was originally developed by Matthew J Heaney. --
28 ------------------------------------------------------------------------------
30 -- Tree_Type is used to implement the ordered containers. This package
31 -- declares the tree operations that do not depend on keys.
33 with Ada
.Streams
; use Ada
.Streams
;
36 with package Tree_Types
is new Generic_Tree_Types
(<>);
37 use Tree_Types
, Tree_Types
.Implementation
;
39 with function Parent
(Node
: Node_Access
) return Node_Access
is <>;
40 with procedure Set_Parent
(Node
: Node_Access
; Parent
: Node_Access
) is <>;
41 with function Left
(Node
: Node_Access
) return Node_Access
is <>;
42 with procedure Set_Left
(Node
: Node_Access
; Left
: Node_Access
) is <>;
43 with function Right
(Node
: Node_Access
) return Node_Access
is <>;
44 with procedure Set_Right
(Node
: Node_Access
; Right
: Node_Access
) is <>;
45 with function Color
(Node
: Node_Access
) return Color_Type
is <>;
46 with procedure Set_Color
(Node
: Node_Access
; Color
: Color_Type
) is <>;
48 package Ada
.Containers
.Red_Black_Trees
.Generic_Operations
is
51 function Min
(Node
: Node_Access
) return Node_Access
;
52 -- Returns the smallest-valued node of the subtree rooted at Node
54 function Max
(Node
: Node_Access
) return Node_Access
;
55 -- Returns the largest-valued node of the subtree rooted at Node
57 -- NOTE: The Check_Invariant operation was used during early
58 -- development of the red-black tree. Now that the tree type
59 -- implementation has matured, we don't really need Check_Invariant
62 -- procedure Check_Invariant (Tree : Tree_Type);
64 function Vet
(Tree
: Tree_Type
; Node
: Node_Access
) return Boolean;
65 -- Inspects Node to determine (to the extent possible) whether
66 -- the node is valid; used to detect if the node is dangling.
68 function Next
(Node
: Node_Access
) return Node_Access
;
69 -- Returns the smallest node greater than Node
71 function Previous
(Node
: Node_Access
) return Node_Access
;
72 -- Returns the largest node less than Node
75 with function Is_Equal
(L
, R
: Node_Access
) return Boolean;
76 function Generic_Equal
(Left
, Right
: Tree_Type
) return Boolean;
77 -- Uses Is_Equal to perform a node-by-node comparison of the
78 -- Left and Right trees; processing stops as soon as the first
79 -- non-equal node is found.
81 procedure Delete_Node_Sans_Free
82 (Tree
: in out Tree_Type
;
84 -- Removes Node from Tree without deallocating the node. If Tree
85 -- is busy then Program_Error is raised.
88 with procedure Free
(X
: in out Node_Access
);
89 procedure Generic_Delete_Tree
(X
: in out Node_Access
);
90 -- Deallocates the tree rooted at X, calling Free on each node
93 with function Copy_Node
(Source
: Node_Access
) return Node_Access
;
94 with procedure Delete_Tree
(X
: in out Node_Access
);
95 function Generic_Copy_Tree
(Source_Root
: Node_Access
) return Node_Access
;
96 -- Copies the tree rooted at Source_Root, using Copy_Node to copy each
97 -- node of the source tree. If Copy_Node propagates an exception
98 -- (e.g. Storage_Error), then Delete_Tree is first used to deallocate
99 -- the target tree, and then the exception is propagated.
102 with function Copy_Tree
(Root
: Node_Access
) return Node_Access
;
103 procedure Generic_Adjust
(Tree
: in out Tree_Type
);
104 -- Used to implement controlled Adjust. On input to Generic_Adjust, Tree
105 -- holds a bitwise (shallow) copy of the source tree (as would be the case
106 -- when controlled Adjust is called). On output, Tree holds its own (deep)
107 -- copy of the source tree, which is constructed by calling Copy_Tree.
110 with procedure Delete_Tree
(X
: in out Node_Access
);
111 procedure Generic_Clear
(Tree
: in out Tree_Type
);
112 -- Clears Tree by deallocating all of its nodes. If Tree is busy then
113 -- Program_Error is raised.
116 with procedure Clear
(Tree
: in out Tree_Type
);
117 procedure Generic_Move
(Target
, Source
: in out Tree_Type
);
118 -- Moves the tree belonging to Source onto Target. If Source is busy then
119 -- Program_Error is raised. Otherwise Target is first cleared (by calling
120 -- Clear, to deallocate its existing tree), then given the Source tree, and
121 -- then finally Source is cleared (by setting its pointers to null).
124 with procedure Process
(Node
: Node_Access
) is <>;
125 procedure Generic_Iteration
(Tree
: Tree_Type
);
126 -- Calls Process for each node in Tree, in order from smallest-valued
127 -- node to largest-valued node.
130 with procedure Process
(Node
: Node_Access
) is <>;
131 procedure Generic_Reverse_Iteration
(Tree
: Tree_Type
);
132 -- Calls Process for each node in Tree, in order from largest-valued
133 -- node to smallest-valued node.
136 with procedure Write_Node
137 (Stream
: not null access Root_Stream_Type
'Class;
139 procedure Generic_Write
140 (Stream
: not null access Root_Stream_Type
'Class;
142 -- Used to implement stream attribute T'Write. Generic_Write
143 -- first writes the number of nodes into Stream, then calls
144 -- Write_Node for each node in Tree.
147 with procedure Clear
(Tree
: in out Tree_Type
);
148 with function Read_Node
149 (Stream
: not null access Root_Stream_Type
'Class) return Node_Access
;
150 procedure Generic_Read
151 (Stream
: not null access Root_Stream_Type
'Class;
152 Tree
: in out Tree_Type
);
153 -- Used to implement stream attribute T'Read. Generic_Read
154 -- first clears Tree. It then reads the number of nodes out of
155 -- Stream, and calls Read_Node for each node in Stream.
157 procedure Rebalance_For_Insert
158 (Tree
: in out Tree_Type
;
160 -- This rebalances Tree to complete the insertion of Node (which
161 -- must already be linked in at its proper insertion position).
163 end Ada
.Containers
.Red_Black_Trees
.Generic_Operations
;