_ptr and _srcptr types

[Vincent Lefevre]

I've just noticed that GMP provides mpz_inits, so that mpz_ptr is
necessary: Since type checking cannot be done with variadic functions,
one must provide types compatible with mpz_ptr, or the behavior is
undefined. This is not an issue for mpz_t variables, but the last
argument needs to be (mpz_ptr) 0 or equivalent.

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Vincent Lefèvre <vincent at vinc17.net> - Web: <https://www.vinc17.net/>
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