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 pickid()            Return the identifier of a list item
------------------------------------------------------------------------------
 Declaration
   pick.hdr

 Syntax
   func uint pickid extern
   param value _LIST pList, ;
         value uint  uItem

 Arguments
   pList is a list pointer.
   uItem is a list item index.

 Return
   Item identifier number.

 Description
   The pickid() function returns the identifier number of the specified
   list item.

 Example
   #define EXAMPLE_LIST
   #include example.hdr

   proc Test_pickid
   vardef
      _SLIST pList
      uint   n
   enddef
   pList := pickinit()
   for n := 1 to 5
      pickadd( pList, "hello" )   // add default identifiers using pickadd()
   next
   for n := 1 to 5
      ? pickid( pList, n )                // show id numbers
   next
   pickclear( pList )
   ?
   pList := pickinit()
   for n := 1 to 5
      pickaddid( pList, "hello", 10 - n ) // add explicit identifiers
   next                                   // using pickaddid()
   for n := 1 to 5
      ? pickid( pList, n )                // show id numbers
   next
   pickclear( pList )
   endproc

   proc main
   Test_pickid()
   endproc