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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT LIBRARY COMPONENTS --
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4 -- --
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5 -- ADA.CONTAINERS.INDEFINITE_ORDERED_SETS --
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6 -- --
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7 -- S p e c --
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8 -- --
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9 -- Copyright (C) 2004-2017, Free Software Foundation, Inc. --
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10 -- --
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11 -- This specification is derived from the Ada Reference Manual for use with --
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12 -- GNAT. The copyright notice above, and the license provisions that follow --
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13 -- apply solely to the contents of the part following the private keyword. --
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14 -- --
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15 -- GNAT is free software; you can redistribute it and/or modify it under --
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16 -- terms of the GNU General Public License as published by the Free Soft- --
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17 -- ware Foundation; either version 3, or (at your option) any later ver- --
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18 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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19 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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20 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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21 -- --
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22 -- As a special exception under Section 7 of GPL version 3, you are granted --
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23 -- additional permissions described in the GCC Runtime Library Exception, --
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24 -- version 3.1, as published by the Free Software Foundation. --
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25 -- --
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26 -- You should have received a copy of the GNU General Public License and --
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27 -- a copy of the GCC Runtime Library Exception along with this program; --
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28 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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29 -- <http://www.gnu.org/licenses/>. --
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30 -- --
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31 -- This unit was originally developed by Matthew J Heaney. --
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32 ------------------------------------------------------------------------------
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33
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34 with Ada.Iterator_Interfaces;
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35
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36 with Ada.Containers.Helpers;
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37 private with Ada.Containers.Red_Black_Trees;
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38 private with Ada.Finalization;
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39 private with Ada.Streams;
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40
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41 generic
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42 type Element_Type (<>) is private;
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43
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44 with function "<" (Left, Right : Element_Type) return Boolean is <>;
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45 with function "=" (Left, Right : Element_Type) return Boolean is <>;
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46
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47 package Ada.Containers.Indefinite_Ordered_Sets is
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48 pragma Annotate (CodePeer, Skip_Analysis);
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49 pragma Preelaborate;
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50 pragma Remote_Types;
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51
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52 function Equivalent_Elements (Left, Right : Element_Type) return Boolean;
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53
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54 type Set is tagged private with
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55 Constant_Indexing => Constant_Reference,
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56 Default_Iterator => Iterate,
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57 Iterator_Element => Element_Type;
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58
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59 pragma Preelaborable_Initialization (Set);
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60
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61 type Cursor is private;
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62 pragma Preelaborable_Initialization (Cursor);
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63
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64 Empty_Set : constant Set;
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65
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66 No_Element : constant Cursor;
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67
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68 function Has_Element (Position : Cursor) return Boolean;
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69
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70 package Set_Iterator_Interfaces is new
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71 Ada.Iterator_Interfaces (Cursor, Has_Element);
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72
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73 function "=" (Left, Right : Set) return Boolean;
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74
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75 function Equivalent_Sets (Left, Right : Set) return Boolean;
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76
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77 function To_Set (New_Item : Element_Type) return Set;
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78
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79 function Length (Container : Set) return Count_Type;
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80
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81 function Is_Empty (Container : Set) return Boolean;
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82
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83 procedure Clear (Container : in out Set);
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84
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85 function Element (Position : Cursor) return Element_Type;
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86
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87 procedure Replace_Element
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88 (Container : in out Set;
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89 Position : Cursor;
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90 New_Item : Element_Type);
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91
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92 procedure Query_Element
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93 (Position : Cursor;
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94 Process : not null access procedure (Element : Element_Type));
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95
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96 type Constant_Reference_Type
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97 (Element : not null access constant Element_Type) is
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98 private with
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99 Implicit_Dereference => Element;
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100
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101 function Constant_Reference
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102 (Container : aliased Set;
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103 Position : Cursor) return Constant_Reference_Type;
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104 pragma Inline (Constant_Reference);
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105
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106 procedure Assign (Target : in out Set; Source : Set);
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107
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108 function Copy (Source : Set) return Set;
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109
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110 procedure Move (Target : in out Set; Source : in out Set);
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111
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112 procedure Insert
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113 (Container : in out Set;
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114 New_Item : Element_Type;
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115 Position : out Cursor;
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116 Inserted : out Boolean);
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117
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118 procedure Insert
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119 (Container : in out Set;
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120 New_Item : Element_Type);
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121
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122 procedure Include
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123 (Container : in out Set;
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124 New_Item : Element_Type);
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125
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126 procedure Replace
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127 (Container : in out Set;
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128 New_Item : Element_Type);
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129
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130 procedure Exclude
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131 (Container : in out Set;
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132 Item : Element_Type);
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133
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134 procedure Delete
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135 (Container : in out Set;
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136 Item : Element_Type);
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137
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138 procedure Delete
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139 (Container : in out Set;
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140 Position : in out Cursor);
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141
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142 procedure Delete_First (Container : in out Set);
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143
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144 procedure Delete_Last (Container : in out Set);
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145
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146 procedure Union (Target : in out Set; Source : Set);
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147
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148 function Union (Left, Right : Set) return Set;
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149
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150 function "or" (Left, Right : Set) return Set renames Union;
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151
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152 procedure Intersection (Target : in out Set; Source : Set);
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153
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154 function Intersection (Left, Right : Set) return Set;
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155
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156 function "and" (Left, Right : Set) return Set renames Intersection;
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157
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158 procedure Difference (Target : in out Set; Source : Set);
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159
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160 function Difference (Left, Right : Set) return Set;
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161
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162 function "-" (Left, Right : Set) return Set renames Difference;
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163
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164 procedure Symmetric_Difference (Target : in out Set; Source : Set);
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165
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166 function Symmetric_Difference (Left, Right : Set) return Set;
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167
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168 function "xor" (Left, Right : Set) return Set renames Symmetric_Difference;
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169
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170 function Overlap (Left, Right : Set) return Boolean;
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171
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172 function Is_Subset (Subset : Set; Of_Set : Set) return Boolean;
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173
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174 function First (Container : Set) return Cursor;
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175
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176 function First_Element (Container : Set) return Element_Type;
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177
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178 function Last (Container : Set) return Cursor;
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179
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180 function Last_Element (Container : Set) return Element_Type;
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181
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182 function Next (Position : Cursor) return Cursor;
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183
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184 procedure Next (Position : in out Cursor);
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185
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186 function Previous (Position : Cursor) return Cursor;
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187
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188 procedure Previous (Position : in out Cursor);
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189
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190 function Find
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191 (Container : Set;
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192 Item : Element_Type) return Cursor;
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193
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194 function Floor
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195 (Container : Set;
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196 Item : Element_Type) return Cursor;
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197
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198 function Ceiling
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199 (Container : Set;
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200 Item : Element_Type) return Cursor;
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201
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202 function Contains
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203 (Container : Set;
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204 Item : Element_Type) return Boolean;
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205
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206 function "<" (Left, Right : Cursor) return Boolean;
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207
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208 function ">" (Left, Right : Cursor) return Boolean;
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209
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210 function "<" (Left : Cursor; Right : Element_Type) return Boolean;
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211
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212 function ">" (Left : Cursor; Right : Element_Type) return Boolean;
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213
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214 function "<" (Left : Element_Type; Right : Cursor) return Boolean;
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215
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216 function ">" (Left : Element_Type; Right : Cursor) return Boolean;
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217
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218 procedure Iterate
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219 (Container : Set;
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220 Process : not null access procedure (Position : Cursor));
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221
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222 procedure Reverse_Iterate
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223 (Container : Set;
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224 Process : not null access procedure (Position : Cursor));
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225
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226 function Iterate
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227 (Container : Set)
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228 return Set_Iterator_Interfaces.Reversible_Iterator'class;
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229
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230 function Iterate
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231 (Container : Set;
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232 Start : Cursor)
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233 return Set_Iterator_Interfaces.Reversible_Iterator'class;
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234
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235 generic
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236 type Key_Type (<>) is private;
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237
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238 with function Key (Element : Element_Type) return Key_Type;
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239
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240 with function "<" (Left, Right : Key_Type) return Boolean is <>;
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241
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242 package Generic_Keys is
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243
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244 function Equivalent_Keys (Left, Right : Key_Type) return Boolean;
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245
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246 function Key (Position : Cursor) return Key_Type;
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247
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248 function Element (Container : Set; Key : Key_Type) return Element_Type;
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249
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250 procedure Replace
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251 (Container : in out Set;
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252 Key : Key_Type;
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253 New_Item : Element_Type);
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254
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255 procedure Exclude (Container : in out Set; Key : Key_Type);
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256
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257 procedure Delete (Container : in out Set; Key : Key_Type);
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258
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259 function Find
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260 (Container : Set;
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261 Key : Key_Type) return Cursor;
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262
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263 function Floor
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264 (Container : Set;
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265 Key : Key_Type) return Cursor;
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266
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267 function Ceiling
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268 (Container : Set;
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269 Key : Key_Type) return Cursor;
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270
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271 function Contains
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272 (Container : Set;
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273 Key : Key_Type) return Boolean;
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274
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275 procedure Update_Element_Preserving_Key
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276 (Container : in out Set;
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277 Position : Cursor;
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278 Process : not null access
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279 procedure (Element : in out Element_Type));
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280
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281 type Reference_Type (Element : not null access Element_Type) is private
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282 with
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283 Implicit_Dereference => Element;
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284
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285 function Reference_Preserving_Key
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286 (Container : aliased in out Set;
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287 Position : Cursor) return Reference_Type;
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288
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289 function Constant_Reference
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290 (Container : aliased Set;
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291 Key : Key_Type) return Constant_Reference_Type;
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292
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293 function Reference_Preserving_Key
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294 (Container : aliased in out Set;
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295 Key : Key_Type) return Reference_Type;
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296
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297 private
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298 type Set_Access is access all Set;
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299 for Set_Access'Storage_Size use 0;
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300
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301 type Key_Access is access all Key_Type;
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302
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303 package Impl is new Helpers.Generic_Implementation;
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304
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305 type Reference_Control_Type is
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306 new Impl.Reference_Control_Type with
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307 record
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308 Container : Set_Access;
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309 Pos : Cursor;
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310 Old_Key : Key_Access;
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311 end record;
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312
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313 overriding procedure Finalize (Control : in out Reference_Control_Type);
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314 pragma Inline (Finalize);
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315
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316 type Reference_Type (Element : not null access Element_Type) is record
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317 Control : Reference_Control_Type;
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318 end record;
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319
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320 use Ada.Streams;
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321
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322 procedure Write
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323 (Stream : not null access Root_Stream_Type'Class;
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324 Item : Reference_Type);
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325
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326 for Reference_Type'Write use Write;
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327
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328 procedure Read
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329 (Stream : not null access Root_Stream_Type'Class;
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330 Item : out Reference_Type);
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331
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332 for Reference_Type'Read use Read;
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333 end Generic_Keys;
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334
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335 private
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336 pragma Inline (Next);
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337 pragma Inline (Previous);
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338
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339 type Node_Type;
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340 type Node_Access is access Node_Type;
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341
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342 type Element_Access is access all Element_Type;
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343
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344 type Node_Type is limited record
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345 Parent : Node_Access;
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346 Left : Node_Access;
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347 Right : Node_Access;
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348 Color : Red_Black_Trees.Color_Type := Red_Black_Trees.Red;
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349 Element : Element_Access;
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350 end record;
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351
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352 package Tree_Types is new Red_Black_Trees.Generic_Tree_Types
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353 (Node_Type,
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354 Node_Access);
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355
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356 type Set is new Ada.Finalization.Controlled with record
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357 Tree : Tree_Types.Tree_Type;
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358 end record;
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359
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360 overriding procedure Adjust (Container : in out Set);
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361
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362 overriding procedure Finalize (Container : in out Set) renames Clear;
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363
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364 use Red_Black_Trees;
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365 use Tree_Types, Tree_Types.Implementation;
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366 use Ada.Finalization;
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367 use Ada.Streams;
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368
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369 procedure Write
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370 (Stream : not null access Root_Stream_Type'Class;
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371 Container : Set);
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372
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373 for Set'Write use Write;
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374
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375 procedure Read
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376 (Stream : not null access Root_Stream_Type'Class;
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377 Container : out Set);
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378
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379 for Set'Read use Read;
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380
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381 type Set_Access is access all Set;
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382 for Set_Access'Storage_Size use 0;
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383
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384 type Cursor is record
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385 Container : Set_Access;
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386 Node : Node_Access;
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387 end record;
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388
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389 procedure Write
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390 (Stream : not null access Root_Stream_Type'Class;
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391 Item : Cursor);
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392
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393 for Cursor'Write use Write;
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394
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395 procedure Read
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396 (Stream : not null access Root_Stream_Type'Class;
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397 Item : out Cursor);
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398
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399 for Cursor'Read use Read;
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400
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401 subtype Reference_Control_Type is Implementation.Reference_Control_Type;
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402 -- It is necessary to rename this here, so that the compiler can find it
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403
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404 type Constant_Reference_Type
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405 (Element : not null access constant Element_Type) is
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406 record
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407 Control : Reference_Control_Type :=
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408 raise Program_Error with "uninitialized reference";
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409 -- The RM says, "The default initialization of an object of
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410 -- type Constant_Reference_Type or Reference_Type propagates
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411 -- Program_Error."
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412 end record;
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413
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414 procedure Read
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415 (Stream : not null access Root_Stream_Type'Class;
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416 Item : out Constant_Reference_Type);
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417
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418 for Constant_Reference_Type'Read use Read;
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419
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420 procedure Write
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421 (Stream : not null access Root_Stream_Type'Class;
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422 Item : Constant_Reference_Type);
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423
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424 for Constant_Reference_Type'Write use Write;
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425
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426 -- Three operations are used to optimize in the expansion of "for ... of"
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427 -- loops: the Next(Cursor) procedure in the visible part, and the following
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428 -- Pseudo_Reference and Get_Element_Access functions. See Sem_Ch5 for
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429 -- details.
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430
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431 function Pseudo_Reference
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432 (Container : aliased Set'Class) return Reference_Control_Type;
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433 pragma Inline (Pseudo_Reference);
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434 -- Creates an object of type Reference_Control_Type pointing to the
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435 -- container, and increments the Lock. Finalization of this object will
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436 -- decrement the Lock.
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437
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438 function Get_Element_Access
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439 (Position : Cursor) return not null Element_Access;
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440 -- Returns a pointer to the element designated by Position.
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441
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442 Empty_Set : constant Set := (Controlled with others => <>);
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443
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444 No_Element : constant Cursor := Cursor'(null, null);
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445
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446 type Iterator is new Limited_Controlled and
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447 Set_Iterator_Interfaces.Reversible_Iterator with
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448 record
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449 Container : Set_Access;
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450 Node : Node_Access;
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451 end record
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452 with Disable_Controlled => not T_Check;
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453
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454 overriding procedure Finalize (Object : in out Iterator);
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455
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456 overriding function First (Object : Iterator) return Cursor;
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457 overriding function Last (Object : Iterator) return Cursor;
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458
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459 overriding function Next
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460 (Object : Iterator;
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461 Position : Cursor) return Cursor;
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462
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463 overriding function Previous
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464 (Object : Iterator;
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465 Position : Cursor) return Cursor;
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466
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467 end Ada.Containers.Indefinite_Ordered_Sets;
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