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 AX_KeysIncluded()
 Determine number of keys included in the index
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 Syntax

     AX_KeysIncluded() -> numeric

 Returns

     Returns a numeric value representing the number of keys included in
     the current index or tag so far, as it is being created or reindexed.

 Description

     AX_KeysIncluded() determines the number of keys that have been
     included in the current index or tag during the indexing or reindexing
     process.  This function is used in a UDF, specified with the EVAL
     clause of INDEX or REINDEX, to identify how many records have made it
     into the index.  It is especially useful when creating or reindexing
     a filtered index.

 Example

     USE TEST VIA "DBFCDXAX"            // TEST.CDX opened automatically
     REINDEX EVAL ShowIt() EVERY 100

     FUNC ShowIt()

        // Display the index file and tag name.
        ? "Reindexing " + AX_I_IndexName() + " : " + AX_I_TagName()
        ?
        // Show how many keys have been included.
        @ ROW(), 1 SAY AX_KeysIncluded()

     RETURN .T.