// TYPE = int, float or double
int size = 1022345; 
TYPE *tab;
MPIReductor<TYPE> reductor(...);

// creation of global array on Master only
if (reductor.is_master()) {
	// initialize array
	tab = new TYPE [ size ];
	size_t index = 0;
	for (int cpu = 0; cpu < reductor.max_cpus(); ++cpu) {
		for (size_t i = 0; i < reductor.local_sizes()[cpu]; ++i) {
			tab[index++] = (cpu+1);
		}
	}

	cout << "GLOBAL_ARRAY=";
	for (int i=0;i<size;++i) cout << tab[i] << " ";
	cout << endl;
}

// all CPUs do the job
reductor.process_and_print(tab, ...);