documentation on internals not up to date

[Niels Möller]

Marc Glisse <marc.glisse at inria.fr> writes:

> There would be a significant advantage to mpq if we could have a
> non-allocated 1 for the denominator. But indeed, with the current code
> where only some mpz functions would work, it seems safer to document
> that none work.

We could do that internally, even if we don't advertise it for other gmp
users. Then mpq_init wouldn't do any allocation, right? We could have a
single mpq object representing 0/1 with _mp_alloc == 0 for both parts,
and initialize with struct assignment or memcpy.

We would just ensure that mpz realloc keeps supporting thuis case.

Regards,
/Niels

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