Sujet : Re: D correctly simulated by pure function H remains stuck in recursive simulation s
De : Bonita.Montero (at) *nospam* gmail.com (Bonita Montero)
Groupes : comp.lang.c++ comp.lang.cDate : 22. May 2024, 17:31:22
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <v2l6kj$18q32$2@raubtier-asyl.eternal-september.org>
References : 1
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Am 22.05.2024 um 15:57 schrieb olcott:
Because D correctly simulated by pure function H remains stuck in
recursive simulation simulating termination analyzer H is correct
to report that D does not halt.
typedef int (*ptr)(); // ptr is pointer to int function in C
00 int H(ptr p, ptr i);
01 int D(ptr p)
02 {
03 int Halt_Status = H(p, p);
04 if (Halt_Status)
05 HERE: goto HERE;
06 return Halt_Status;
07 }
08
09 int main()
10 {
11 H(D,D);
12 return 0;
13 }
It is trivial to see that for every H/D pair of the infinite
set of H/D pairs that match the above template that
D correctly simulated by H cannot possibly reach its own final
state at line 06 and halt because D correctly simulated by
H remains stuck in recursive simulation.
This provides the basis for simulating termination analyzer H to
correctly determine that the halting problem's counter-example
input D cannot possibly halt.
Ok, then every question is answered and we could proceed to
"sth. completely different" (Monty Python).