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A.4.6 String-Handling Sets and Mappings

1
The language-defined package Strings.Maps.Constants declares Character_Set and Character_Mapping constants corresponding to classification and conversion functions in package Characters.Handling.
1.a
Discussion: The Constants package is a child of Strings.Maps since it needs visibility of the private part of Strings.Maps in order to initialize the constants in a preelaborable way (i.e. via aggregates versus function calls). 

Static Semantics

2
The library package Strings.Maps.Constants has the following declaration:
3/2
{AI95-00362-01} package Ada.Strings.Maps.Constants is
   pragma Pure Preelaborate(Constants);
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   Control_Set           : constant Character_Set;
   Graphic_Set           : constant Character_Set;
   Letter_Set            : constant Character_Set;
   Lower_Set             : constant Character_Set;
   Upper_Set             : constant Character_Set;
   Basic_Set             : constant Character_Set;
   Decimal_Digit_Set     : constant Character_Set;
   Hexadecimal_Digit_Set : constant Character_Set;
   Alphanumeric_Set      : constant Character_Set;
   Special_Set           : constant Character_Set;
   ISO_646_Set           : constant Character_Set;
5
   Lower_Case_Map        : constant Character_Mapping;
     --Maps to lower case for letters, else identity
   Upper_Case_Map        : constant Character_Mapping;
     --Maps to upper case for letters, else identity
   Basic_Map             : constant Character_Mapping;
     --Maps to basic letter for letters, else identity
6
private
   ... -- not specified by the language
end Ada.Strings.Maps.Constants;
7
Each of these constants represents a correspondingly named set of characters or character mapping in Characters.Handling (see A.3.2). 

Extensions to Ada 95

7.a/2
{AI95-00362-01} {extensions to Ada 95} Strings.Maps.Constants is now Pure, so it can be used in pure units. 

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