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630: Sidetrip

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