Function Arguments

A function argument is a PML reference to a value or object outside the function. In effect the argument is another name for the original PML Variable.

If we define a PML Function such as the following:

define function !!ChangeIt ( !Argument is STRING)

 !Argument = 'New Value'

 $P !Argument

 $P !!Global Var

endfunction

Then invoke the function like this:

!!GlobalVar = ‘Old Value’

!!ChangeIt (!!GlobalVar)

The values printed for !Argument and !!GlobalVar will both be 'NewValue'.

Warning: Be very careful about changing function arguments. It is a powerful feature capable of causing unexpected results.