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Again, the definition of va_arg is implementation dependent, but the
effect is as though the following were written in the definition of
construct_trade:
Cast argument_pointer to
appropriate data type
| *-- Increment pointer after the value is
v | returned; because pointer is cast
-------- v to argument type, incrementing moves
(*((type *) argument_pointer)++) the argument pointer properly
^
|
*-- Dereference argument_pointer
to get argument value