pub unsafe extern "C" fn CPXsetnodecallbackfunc(
env: CPXENVptr,
nodecallback: Option<unsafe extern "C" fn(xenv: CPXCENVptr, cbdata: *mut c_void, wherefrom: c_int, cbhandle: *mut c_void, nodeindex: *mut c_int, useraction: *mut c_int) -> c_int>,
cbhandle: *mut c_void,
) -> c_int