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 menuchk()           Validate a menu pointer
------------------------------------------------------------------------------
 Declaration
   menu.hdr

 Syntax
   func logical menuchk extern
   param value _MENU pMenu

 Arguments
   pMenu is the pointer to a previously created menu system. If 0, the
         default menu will be used.

 Return
   A logical indicating if pMenu is a valid menu pointer.

 Description
   This function tests if the passed value is a valid menu pointer. It should
   be used by customized menu handlers if the default run-time error handling
   for menus is turned off.

 Example
   #define EXAMPLE_MENU
   #include example.hdr

   proc Test_menuchk
   vardef
      _MENU pMenu
   enddef
   menuseterror( .f. )   // turn off menu run-time error handling
   ? menuchk( pMenu )    // prints .F.
   pMenu = menunew()
   ? menuchk( pMenu )    // prints .T.
   menuclear( pMenu )
   ? menuchk( pMenu )    // prints .F.
   endproc

   proc main
   Test_menuchk()
   endproc