__fastcall TDBISAMFieldDef(TDBISAMFieldDefs* Owner, const
      System::UnicodeString Name, Data::Db::TFieldType DataType, int
      Size, bool Required, const System::UnicodeString DefaultValue,
      const System::UnicodeString MinValue, const
      System::UnicodeString MaxValue, const System::UnicodeString
      Description, TFieldCharCase CharCase, System::Byte Compression,
      int FieldNo)

Use the New operator to create an instance of a TDBISAMFieldDef object using the constructor. However, you should never need to create an instance of the TDBISAMFieldDef object since one is automatically created when using the various methods of the TDBISAMFieldDefs object.