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 ptrtodbl()          Read a dbl value from a memory address
------------------------------------------------------------------------------
 Declaration
   memory.hdr

 Syntax
   func dbl ptrtodbl extern
   param value _POINTER pMem

 Arguments
   pMem is a memory address.

 Return
   A dbl value.

 Description
   This function returns the dbl located at the specified memory address.

   The function is included for compatibility with earlier Force versions.
   Use the ptr() data type in conjunction with the & and * operators for
   directly writing to explicit memory addresses.

 Example
   #define EXAMPLE_MEMORY
   #include example.hdr

   proc Test_ptrtodbl
   vardef
      dbl        eVar
      ptr( dbl ) pMem
   enddef
   eVar := -123.456
   ? eVar                        // access dbl variable directly
   ? ptrtodbl( addr( eVar ) )    // access dbl variable using function calls
   pMem := &eVar                 // access dbl variable using pointer
   ? *pMem
   endproc

   proc main
   Test_ptrtodbl()
   endproc