-- Type interning - set of unique objects. -- Copyright (C) 2019 Tristan Gingold -- -- This program is free software: you can redistribute it and/or modify -- it under the terms of the GNU General Public License as published by -- the Free Software Foundation, either version 2 of the License, or -- (at your option) any later version. -- -- This program is distributed in the hope that it will be useful, -- but WITHOUT ANY WARRANTY; without even the implied warranty of -- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -- GNU General Public License for more details. -- -- You should have received a copy of the GNU General Public License -- along with this program. If not, see . with Hash; use Hash; with Dyn_Maps; -- This generic package provides a factory to build unique objects. -- Get will return an existing object or create a new one. generic -- Parameters of the object to be created. type Params_Type (<>) is private; -- Object to be built and stored. type Object_Type is private; -- Reduce PARAMS to a small value. -- The required property is: Hash(P1) /= Hash(P2) => P1 /= P2. with function Hash (Params : Params_Type) return Hash_Value_Type; -- Create an object from PARAMS. with function Build (Params : Params_Type) return Object_Type; -- Return True iff OBJ is the object corresponding to PARAMS. with function Equal (Obj : Object_Type; Params : Params_Type) return Boolean; package Dyn_Interning is type No_Value_Type is null record; function Build_No_Value (Obj : Object_Type) return No_Value_Type; package Map is new Dyn_Maps (Params_Type => Params_Type, Object_Type => Object_Type, Value_Type => No_Value_Type, Hash => Hash, Build => Build, Build_Value => Build_No_Value, Equal => Equal); subtype Instance is Map.Instance; -- Initialize. Required before any other operation. procedure Init (Inst : out Instance) renames Map.Init; procedure Free (Inst : in out Instance) renames Map.Free; -- Export Index_Type... subtype Index_Type is Map.Index_Type; function "+" (L, R : Index_Type) return Index_Type renames Map."+"; function ">" (L, R : Index_Type) return Boolean renames Map.">"; function "<=" (L, R : Index_Type) return Boolean renames Map."<="; No_Index : constant Index_Type := Map.No_Index; First_Index : constant Index_Type := Map.First_Index; -- If there is already an existing object for PARAMS, return it. -- Otherwise create it. procedure Get (Inst : in out Instance; Params : Params_Type; Res : out Object_Type); -- Likewise, but return its index. procedure Get_Index (Inst : in out Instance; Params : Params_Type; Idx : out Index_Type) renames Map.Get_Index; -- Get the number of elements in the table. function Last_Index (Inst : Instance) return Index_Type renames Map.Last_Index; -- Get an element by index. The index has no real meaning, but the -- current implementation allocates index incrementally. function Get_By_Index (Inst : Instance; Index : Index_Type) return Object_Type renames Map.Get_By_Index; end Dyn_Interning; f='#n12'>12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221