pub unsafe extern "C" fn fftwf_plan_many_dft_c2r(
rank: c_int,
n: *const c_int,
howmany: c_int,
in_: *mut fftwf_complex,
inembed: *const c_int,
istride: c_int,
idist: c_int,
out: *mut f32,
onembed: *const c_int,
ostride: c_int,
odist: c_int,
flags: c_uint,
) -> fftwf_plan