pub unsafe extern "C" fn cgmin(
n: c_int,
Bvec: *mut c_double,
X: *mut c_double,
Fmin: *mut c_double,
_fn: optimfn,
gr: optimgr,
fail: *mut c_int,
abstol: c_double,
intol: c_double,
ex: *mut c_void,
_type: c_int,
trace: c_int,
fncount: *mut c_int,
grcount: *mut c_int,
maxit: c_int,
)