[m-rev.] For review: ensure proper initialisation of pretty_printer

[Ralph Becket]

Peter Wang, Tuesday, 27 April 2010:
> On 27 April 2010 11:50, Ralph Becket <rafe at csse.unimelb.edu.au> wrote:
> > Peter, can you show me how to set up a mutable variable in Erlang
> > under Mercury?
> 
> The following is the code generated for this declaration, with some
> simplification:
> 
>   :- mutable(foo, int, 123, ground, [untrailed, attach_to_io_state]).
> 
> 
> get_foo_1_p_0() ->
>   'ML_erlang_global_server' ! {get_mutable, t__mutable_variable_foo, self()},
>   receive
>     {get_mutable_ack, Value} ->
>       Value
>   end.
> 
> set_foo_1_p_0(X) ->
>   'ML_erlang_global_server' ! {set_mutable, t__mutable_variable_foo, X}.
> 
> 
> ! is the 'send' operator
> 
> 'ML_erlang_global_server' is the name of the process holding a table of globals
> 
> get_mutable, set_mutable, t__mutable_variable_foo are just atoms

Magic!
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