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This method “steps through” the valuator.
The return value is a Marpa_Step_Type
,
an integer which indicates the type of step.
How the application is expected to act on
each step is described below
(Valuator steps by type).
When the iteration through the steps is finished,
marpa_v_step()
returns MARPA_STEP_INACTIVE
.
Return value: On success, a Marpa_Step_Type
,
which always be a non-negative integer.
On failure, -2.