Function gmp_mpfr_sys::mpfr::mpfr_strtofr

pub unsafe extern fn mpfr_strtofr(rop: *mut __mpfr_struct,
                                  nptr: *const c_char,
                                  endptr: *mut *mut c_char,
                                  base: c_int,
                                  rnd: mpfr_rnd_t)
                                  -> c_int