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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 -- A D A . C O N T A I N E R S . I N D E F I N I T E _ H O L D E R S --
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6 -- --
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7 -- S p e c --
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8 -- --
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131
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9 -- Copyright (C) 2011-2018, Free Software Foundation, Inc. --
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111
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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
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32 private with Ada.Finalization;
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33 private with Ada.Streams;
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34
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35 generic
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36 type Element_Type (<>) is private;
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37 with function "=" (Left, Right : Element_Type) return Boolean is <>;
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38
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39 package Ada.Containers.Indefinite_Holders is
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40 pragma Annotate (CodePeer, Skip_Analysis);
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41 pragma Preelaborate (Indefinite_Holders);
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42 pragma Remote_Types (Indefinite_Holders);
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43
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44 type Holder is tagged private;
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45 pragma Preelaborable_Initialization (Holder);
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46
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47 Empty_Holder : constant Holder;
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48
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49 function "=" (Left, Right : Holder) return Boolean;
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50
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51 function To_Holder (New_Item : Element_Type) return Holder;
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52
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53 function Is_Empty (Container : Holder) return Boolean;
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54
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55 procedure Clear (Container : in out Holder);
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56
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57 function Element (Container : Holder) return Element_Type;
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58
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59 procedure Replace_Element
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60 (Container : in out Holder;
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61 New_Item : Element_Type);
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62
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63 procedure Query_Element
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64 (Container : Holder;
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65 Process : not null access procedure (Element : Element_Type));
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66
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67 procedure Update_Element
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68 (Container : in out Holder;
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69 Process : not null access procedure (Element : in out Element_Type));
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70
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71 type Constant_Reference_Type
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72 (Element : not null access constant Element_Type) is private
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73 with
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74 Implicit_Dereference => Element;
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75
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76 type Reference_Type
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77 (Element : not null access Element_Type) is private
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78 with
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79 Implicit_Dereference => Element;
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80
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81 function Constant_Reference
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82 (Container : aliased Holder) return Constant_Reference_Type;
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83 pragma Inline (Constant_Reference);
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84
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85 function Reference
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86 (Container : aliased in out Holder) return Reference_Type;
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87 pragma Inline (Reference);
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88
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89 procedure Assign (Target : in out Holder; Source : Holder);
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90
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91 function Copy (Source : Holder) return Holder;
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92
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93 procedure Move (Target : in out Holder; Source : in out Holder);
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94
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95 private
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96
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97 use Ada.Finalization;
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98 use Ada.Streams;
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99
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100 type Element_Access is access all Element_Type;
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101
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102 type Holder_Access is access all Holder;
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103 for Holder_Access'Storage_Size use 0;
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104
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105 procedure Read
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106 (Stream : not null access Ada.Streams.Root_Stream_Type'Class;
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107 Container : out Holder);
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108
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109 procedure Write
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110 (Stream : not null access Ada.Streams.Root_Stream_Type'Class;
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111 Container : Holder);
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112
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113 type Holder is new Ada.Finalization.Controlled with record
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114 Element : Element_Access;
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115 Busy : Natural := 0;
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116 end record;
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117 for Holder'Read use Read;
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118 for Holder'Write use Write;
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119
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120 overriding procedure Adjust (Container : in out Holder);
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121 overriding procedure Finalize (Container : in out Holder);
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122
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123 type Reference_Control_Type is new Controlled with
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124 record
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125 Container : Holder_Access;
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126 end record;
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127
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128 overriding procedure Adjust (Control : in out Reference_Control_Type);
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129 pragma Inline (Adjust);
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130
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131 overriding procedure Finalize (Control : in out Reference_Control_Type);
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132 pragma Inline (Finalize);
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133
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134 type Constant_Reference_Type
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135 (Element : not null access constant Element_Type) is
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136 record
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137 Control : Reference_Control_Type :=
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138 raise Program_Error with "uninitialized reference";
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139 -- The RM says, "The default initialization of an object of
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140 -- type Constant_Reference_Type or Reference_Type propagates
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141 -- Program_Error."
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142 end record;
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143
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144 procedure Write
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145 (Stream : not null access Root_Stream_Type'Class;
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146 Item : Constant_Reference_Type);
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147
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148 for Constant_Reference_Type'Write use Write;
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149
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150 procedure Read
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151 (Stream : not null access Root_Stream_Type'Class;
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152 Item : out Constant_Reference_Type);
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153
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154 for Constant_Reference_Type'Read use Read;
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155
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156 type Reference_Type (Element : not null access Element_Type) is record
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157 Control : Reference_Control_Type :=
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158 raise Program_Error with "uninitialized reference";
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159 -- The RM says, "The default initialization of an object of
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160 -- type Constant_Reference_Type or Reference_Type propagates
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161 -- Program_Error."
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162 end record;
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163
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164 procedure Write
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165 (Stream : not null access Root_Stream_Type'Class;
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166 Item : Reference_Type);
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167
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168 for Reference_Type'Write use Write;
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169
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170 procedure Read
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171 (Stream : not null access Root_Stream_Type'Class;
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172 Item : out Reference_Type);
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173
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174 for Reference_Type'Read use Read;
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175
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176 Empty_Holder : constant Holder := (Controlled with null, 0);
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177
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178 end Ada.Containers.Indefinite_Holders;
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