Python for air traffic control?

Mirko Liss mirko.liss at web.de
Wed Jul 4 03:32:32 CEST 2001


On 3 Jul 2001, Russ wrote:

> Consider the type checking in C or C++, for example. Suppose that a
> function takes several ints (or any other type) as arguments, and
> suppose the calls of the function all pass ints in the correct slots.
> The compiler will be perfectly happy. Does that assure that the
> arguments are passed correctly? Of course not. It is a necessary but
> not sufficient condition for correctness. The arguments could be
> completely out of order, and the compiler wouldn't have a clue.

If the arguments of a function are out of order, the compiler 
should bark and die, shouldn´t it?

Most programmers use type definitions deliberately, just to provoke
that kind of compile-time errors.

An example in C:

typedef plane_t int ;  /* plane no */
typedef lane_t int  ;  /* lane no */
typedef go_down_in_pieces_t bool ;  
go_down_in_pieces_t dispatch( plane_t flightno, \
                              lane_t neigboring_highway ) ;

If the arguments get swapped, the compiler gets angry.
Is this what you wanted to have in C ?

Run-time exceptions should be treated differently than 
compile-time errors and warnings. 
In Python, you end up with lots of possible exceptions
at run-time. Supposedly, you might want to drop dynamic 
typing for your kind of application. 


Regards,

Mirko




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