ADA, Language Topics, INDEXED_IO
*Conan The Librarian
INDEXED_IO is a generic Compaq Ada package that provides input- output operations for access to and from indexed files. All of the file management input-output operations are also provided by this package (see HELP Ada Language_Topics File_ Management). The package INDEXED_IO 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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