String-Handling Sets and Mappings
Author: JTC1/SC22/WG9/ARG, by Randall Brukardt, ARG Editor

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# A.4.6 String-Handling Sets and Mappings

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The language-defined package Strings.Maps.Constants declares Character_Set and Character_Mapping constants corresponding to classification and conversion functions in package Characters.Handling.

#### Static Semantics

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The library package Strings.Maps.Constants has the following declaration:
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package Ada.Strings.Maps.Constants is
pragma Pure(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;
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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
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private
... -- not specified by the language
end Ada.Strings.Maps.Constants;
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Each of these constants represents a correspondingly named set of characters or character mapping in Characters.Handling (see A.3.2).

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