Ada Reference Manual (Ada 2022)
A.3.1 The Packages Characters, Wide_Characters, and Wide_Wide_Characters
Static Semantics
The library package Characters has the following declaration:
package Ada.Characters
with Pure is
end Ada.Characters;
with Pure is
end Ada.Characters;
The library package Wide_Characters has the following declaration:
package Ada.Wide_Characters
with Pure is
end Ada.Wide_Characters;
with Pure is
end Ada.Wide_Characters;
The library package Wide_Wide_Characters has the following declaration:
package Ada.Wide_Wide_Characters
with Pure is
end Ada.Wide_Wide_Characters;
with Pure is
end Ada.Wide_Wide_Characters;
Implementation Advice
If an implementation chooses to provide implementation-defined operations on Wide_Character or Wide_String (such as collating and sorting, etc.) it should do so by providing child units of Wide_Characters. Similarly if it chooses to provide implementation-defined operations on Wide_Wide_Character or Wide_Wide_String it should do so by providing child units of Wide_Wide_Characters.
