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 FUNCTION AFIELDSTYPE()

  Short:
  ------
  AFIELDSTYPE() Returns an array of field names of particular type

  Returns:
  --------
  <aFields> => an array of field names of the selected type(s)

  Syntax:
  -------
  AFIELDSTYPE(cTypes)

  Description:
  ------------
  <cTypes> is a string containing one or more field
  type symbols

  Valid symbols are:

       C   character    N   numeric
       L   logical      D    date          M   memo

  If no fields of the specified type(s) exist, an empty
  array will be returned.

  Examples:
  ---------
   aMemos := AFIELDSTYPE("M")  // an array of memo fields
   aNums  := AFIELDSTYPE("N")  // an array of numeric fields
   aNums  := AFIELDSTYPE("LD")  // an array of date &logical fields

  Source:
  -------
  S_AFTYPE.PRG