/usr/include/flint/fmpz-conversions.h is in libflint-dev 2.5.2-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | #ifndef FMPZ_CONVERSIONS_H
#define FMPZ_CONVERSIONS_H
/* turn a pointer to an __mpz_struct into a fmpz_t */
#define PTR_TO_COEFF(x) (((ulong) (x) >> 2) | (WORD(1) << (FLINT_BITS - 2)))
/* turns an fmpz into a pointer to an mpz */
#define COEFF_TO_PTR(x) ((__mpz_struct *) ((x) << 2))
#endif /* FMPZ_CONVERSIONS_H */
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