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 A.4.8 Wide_Wide_String Handling

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{AI95-00285-01} {AI95-00395-01} Facilities for handling strings of Wide_Wide_Character elements are found in the packages Strings.Wide_Wide_Maps, Strings.Wide_Wide_Fixed, Strings.Wide_Wide_Bounded, Strings.Wide_Wide_Unbounded, and Strings.Wide_Wide_Maps.Wide_Wide_Constants, and in the functions Strings.Wide_Wide_Hash, Strings.Wide_Wide_Fixed.Wide_Wide_Hash, Strings.Wide_Wide_Bounded.Wide_Wide_Hash, and Strings.Wide_Wide_Unbounded.Wide_Wide_Hash. They provide the same string-handling operations as the corresponding packages and functions for strings of Character elements.

Static Semantics

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{AI95-00285-01} The library package Strings.Wide_Wide_Maps has the following declaration.
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package Ada.Strings.Wide_Wide_Maps is
   pragma Preelaborate(Wide_Wide_Maps);
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   -- Representation for a set of Wide_Wide_Character values:
   type Wide_Wide_Character_Set is private;
   pragma Preelaborable_Initialization(Wide_Wide_Character_Set);
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   Null_Set : constant Wide_Wide_Character_Set;
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   type Wide_Wide_Character_Range is
      record
         Low  : Wide_Wide_Character;
         High : Wide_Wide_Character;
      end record;
   -- Represents Wide_Wide_Character range Low..High
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   type Wide_Wide_Character_Ranges is array (Positive range <>)
         of Wide_Wide_Character_Range;
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   function To_Set (Ranges : in Wide_Wide_Character_Ranges)
         return Wide_Wide_Character_Set;
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   function To_Set (Span : in Wide_Wide_Character_Range)
         return Wide_Wide_Character_Set;
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   function To_Ranges (Set : in Wide_Wide_Character_Set)
         return Wide_Wide_Character_Ranges;
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   function "=" (Left, Right : in Wide_Wide_Character_Set) return Boolean;
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   function "not" (Right : in Wide_Wide_Character_Set)
         return Wide_Wide_Character_Set;
   function "and" (Left, Right : in Wide_Wide_Character_Set)
         return Wide_Wide_Character_Set;
   function "or" (Left, Right : in Wide_Wide_Character_Set)
         return Wide_Wide_Character_Set;
   function "xor" (Left, Right : in Wide_Wide_Character_Set)
         return Wide_Wide_Character_Set;
   function "-" (Left, Right : in Wide_Wide_Character_Set)
         return Wide_Wide_Character_Set;
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   function Is_In (Element : in Wide_Wide_Character;
                   Set     : in Wide_Wide_Character_Set)
         return Boolean;
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   function Is_Subset (Elements : in Wide_Wide_Character_Set;
                       Set      : in Wide_Wide_Character_Set)
         return Boolean;
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   function "<=" (Left  : in Wide_Wide_Character_Set;
                  Right : in Wide_Wide_Character_Set)
         return Boolean renames Is_Subset;
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   -- Alternative representation for a set of Wide_Wide_Character values:
   subtype Wide_Wide_Character_Sequence is Wide_Wide_String;
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   function To_Set (Sequence : in Wide_Wide_Character_Sequence)
         return Wide_Wide_Character_Set;
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   function To_Set (Singleton : in Wide_Wide_Character)
         return Wide_Wide_Character_Set;
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   function To_Sequence (Set : in Wide_Wide_Character_Set)
         return Wide_Wide_Character_Sequence;
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   -- Representation for a Wide_Wide_Character to Wide_Wide_Character
   -- mapping:
   type Wide_Wide_Character_Mapping is private;
   pragma Preelaborable_Initialization(Wide_Wide_Character_Mapping);
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   function Value (Map     : in Wide_Wide_Character_Mapping;
                   Element : in Wide_Wide_Character)
         return Wide_Wide_Character;
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   Identity : constant Wide_Wide_Character_Mapping;
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   function To_Mapping (From, To : in Wide_Wide_Character_Sequence)
         return Wide_Wide_Character_Mapping;
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   function To_Domain (Map : in Wide_Wide_Character_Mapping)
         return Wide_Wide_Character_Sequence;
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   function To_Range (Map : in Wide_Wide_Character_Mapping)
         return Wide_Wide_Character_Sequence;
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   type Wide_Wide_Character_Mapping_Function is
         access function (From : in Wide_Wide_Character)
         return Wide_Wide_Character;
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private
   ... -- not specified by the language
end Ada.Strings.Wide_Wide_Maps;
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 {AI95-00285-01} The context clause for each of the packages Strings.Wide_Wide_Fixed, Strings.Wide_Wide_Bounded, and Strings.Wide_Wide_Unbounded identifies Strings.Wide_Wide_Maps instead of Strings.Maps.
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 {AI95-00285-01} For each of the packages Strings.Fixed, Strings.Bounded, Strings.Unbounded, and Strings.Maps.Constants, and for functions Strings.Hash, Strings.Fixed.Hash, Strings.Bounded.Hash, and Strings.Unbounded.Hash, the corresponding wide wide string package or function has the same contents except that
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 {AI95-00285-01} {AI95-00395-01} The following additional declarations are present in Strings.Wide_Wide_Maps.Wide_Wide_Constants:
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Character_Set : constant Wide_Wide_Maps.Wide_Wide_Character_Set;
-- Contains each Wide_Wide_Character value WWC such that
-- Characters.Conversions.Is_Character(WWC) is True
Wide_Character_Set : constant Wide_Wide_Maps.Wide_Wide_Character_Set;
-- Contains each Wide_Wide_Character value WWC such that
-- Characters.Conversions.Is_Wide_Character(WWC) is True
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 {AI95-00395-01} Each Wide_Wide_Character_Set constant in the package Strings.Wide_Wide_Maps.Wide_Wide_Constants contains no values outside the Character portion of Wide_Wide_Character. Similarly, each Wide_Wide_Character_Mapping constant in this package is the identity mapping when applied to any element outside the Character portion of Wide_Wide_Character.
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 {AI95-00395-01} Pragma Pure is replaced by pragma Preelaborate in Strings.Wide_Wide_Maps.Wide_Wide_Constants.
NOTES
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14  {AI95-00285-01} {Constraint_Error (raised by failure of run-time check)} If a null Wide_Wide_Character_Mapping_Function is passed to any of the Wide_Wide_String handling subprograms, Constraint_Error is propagated. 

Extensions to Ada 95

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{AI95-00285-01} {AI95-00395-01} {extensions to Ada 95} The double-wide string-handling packages (Strings.Wide_Wide_Maps, Strings.Wide_Wide_Fixed, Strings.Wide_Wide_Bounded, Strings.Wide_Wide_Unbounded, and Strings.Wide_Wide_Maps.Wide_Wide_Constants), and functions Strings.Wide_Wide_Hash and Strings.Wide_Wide_Unbounded.Wide_Wide_Hash are new. 

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