Ada Reference Manual (Ada 2022) — Legal Information

A.4.8 Wide_Wide_String Handling

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 library functions Strings.Wide_Wide_Hash, Strings.Wide_Wide_Fixed.Wide_Wide_Hash, Strings.Wide_Wide_Bounded.Wide_Wide_Hash, Strings.Wide_Wide_Unbounded.Wide_Wide_Hash, Strings.Wide_Wide_Hash_Case_Insensitive, Strings.Wide_Wide_Fixed.Wide_Wide_Hash_Case_Insensitive, Strings.Wide_Wide_Bounded.Wide_Wide_Hash_Case_Insensitive, Strings.Wide_Wide_Unbounded.Wide_Wide_Hash_Case_Insensitive, Strings.Wide_Wide_Equal_Case_Insensitive, Strings.Wide_Wide_Fixed.Wide_Wide_Equal_Case_Insensitive, Strings.Wide_Wide_Bounded.Wide_Wide_Equal_Case_Insensitive, and Strings.Wide_Wide_Unbounded.Wide_Wide_Equal_Case_Insensitive. They provide the same string-handling operations as the corresponding packages and functions for strings of Character elements.

Static Semantics

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The library package Strings.Wide_Wide_Maps has the following declaration.

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package Ada.Strings.Wide_Wide_Maps
with Preelaborate, Nonblocking, Global => in out synchronized is

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   -- Representation for a set of Wide_Wide_Character values:
   type Wide_Wide_Character_Set is private
      with Preelaborable_Initialization;

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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
      with Preelaborable_Initialization;

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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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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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Types Wide_Wide_Character_Set and Wide_Wide_Character_Mapping need finalization.

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For each of the packages Strings.Fixed, Strings.Bounded, Strings.Unbounded, and Strings.Maps.Constants, and for library functions Strings.Hash, Strings.Fixed.Hash, Strings.Bounded.Hash, Strings.Unbounded.Hash, Strings.Hash_Case_Insensitive, Strings.Fixed.Hash_Case_Insensitive, Strings.Bounded.Hash_Case_Insensitive, Strings.Unbounded.Hash_Case_Insensitive, Strings.Equal_Case_Insensitive, Strings.Fixed.Equal_Case_Insensitive, Strings.Bounded.Equal_Case_Insensitive, and Strings.Unbounded.Equal_Case_Insensitive, the corresponding wide wide string package or function has the same contents except that

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Wide_Wide_Space replaces Space

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Wide_Wide_Character replaces Character

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Wide_Wide_String replaces String

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Wide_Wide_Character_Set replaces Character_Set

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Wide_Wide_Character_Mapping replaces Character_Mapping

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Wide_Wide_Character_Mapping_Function replaces Character_Mapping_Function

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Wide_Wide_Maps replaces Maps

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Bounded_Wide_Wide_String replaces Bounded_String

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Null_Bounded_Wide_Wide_String replaces Null_Bounded_String

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To_Bounded_Wide_Wide_String replaces To_Bounded_String

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To_Wide_Wide_String replaces To_String

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Set_Bounded_Wide_Wide_String replaces Set_Bounded_String

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Unbounded_Wide_Wide_String replaces Unbounded_String

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Null_Unbounded_Wide_Wide_String replaces Null_Unbounded_String

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Wide_Wide_String_Access replaces String_Access

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To_Unbounded_Wide_Wide_String replaces To_Unbounded_String

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Set_Unbounded_Wide_Wide_String replaces Set_Unbounded_String

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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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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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Aspect Pure is replaced by aspects Preelaborate, Nonblocking, Global => in out synchronized in Strings.Wide_Wide_Maps.Wide_Wide_Constants.

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NOTE If a null Wide_Wide_Character_Mapping_Function is passed to any of the Wide_Wide_String handling subprograms, Constraint_Error is propagated.

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