Function gmp_mpfr_sys::mpfr::get_str

pub unsafe extern fn get_str(
    str: *mut c_char, 
    expptr: *mut exp_t, 
    b: c_int, 
    n: usize, 
    op: *const mpfr_t, 
    rnd: rnd_t
) -> *mut c_char

See: mpfr_get_str