Ada Programming/Libraries/Ada.Characters.Conversions

is a unit of the Predefined Language Environment since Ada 2005.

Specification
Pure Conversions Is_Character Item  Wide_Character  Boolean Is_String Item  Wide_String  Boolean Is_Character Item  Wide_Wide_Character  Boolean Is_String Item  Wide_Wide_String  Boolean Is_Wide_Character Item  Wide_Wide_Character  Boolean Is_Wide_String Item  Wide_Wide_String  Boolean To_Wide_Character Item  Character  Wide_Character To_Wide_String Item  String  Wide_String To_Wide_Wide_Character Item  Character Wide_Wide_Character To_Wide_Wide_String Item  String  Wide_Wide_String To_Wide_Wide_Character Item  Wide_Character Wide_Wide_Character To_Wide_Wide_String Item  Wide_String Wide_Wide_String To_Character Item        Wide_Character Substitute  Character Character To_String Item        Wide_String Substitute  Character String To_Character Item        Wide_Wide_Character Substitute  Character Character To_String Item        Wide_Wide_String Substitute  Character String To_Wide_Character Item        Wide_Wide_Character Substitute  Wide_Character Wide_Character To_Wide_String Item        Wide_Wide_String Substitute  Wide_Character Wide_String AdaCharactersConversions

Wikibook

 * Ada Programming/Libraries/Ada