pub unsafe extern "C" fn Rdqags(
f: integr_fn,
ex: *mut c_void,
a: *mut c_double,
b: *mut c_double,
epsabs: *mut c_double,
epsrel: *mut c_double,
result: *mut c_double,
abserr: *mut c_double,
neval: *mut c_int,
ier: *mut c_int,
limit: *mut c_int,
lenw: *mut c_int,
last: *mut c_int,
iwork: *mut c_int,
work: *mut c_double,
)