ADA, Language Topics, INDEXED_MIXED_IO
*Conan The Librarian
INDEXED_MIXED_IO is a Compaq Ada package that provides input-output operations for access to and from indexed files whose elements contain values of different types. All of the file management and item input-output operations are also provided by this package (see HELP Ada Language_Topics File_ Management and HELP Ada Language_Topics Item_Input_Output) This package provides a generic READ_BY_KEY procedure, which defines input for the given element type. This procedure must be instantiated with an actual type parameter for the generic parameter KEY_TYPE; it may be instantiated with or without a value for the generic parameter DEFAULT_KEY_NUMBER. The range of values for DEFAULT_KEY_NUMBER is 0 to 254; a value of 0 (the default) designates the primary key. If the RELATION parameter to the READ_BY_KEY procedure is specified, it must have a value of EQUAL_NEXT, EQUAL, or NEXT (the default is EQUAL).
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