template<typename T> void mergesort( Array-Type values, size_t size, size_t depth );

struct Msg : public uActor::SenderMsg { // derived message
	...
};
_Actor A {
	A * parent;
	uActor::Allocation receive( uActor::Message & msg ) {
		iftype( Msg, msg ) {
			parent = dynamic_cast<A *>(msg_d.sender()); // message sender, maybe nullptr
			...
		} ...
	}

8 25 6 8 -5 99 100 101 7
3 1 -3 5
0
10 9 8 7 6 5 4 3 2 1 0
61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37
36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12
11 10 9 8 7 6 5 4 3 2 1 0

size_t times = sqrt( size );
for ( size_t counter = 0; counter < times; counter += 1 ) {
	swap( values[0], values[prng( size ) ] );
} // for

uProcessor p[ (1 << depth) - 1 ] __attribute__(( unused )); // 2^depth-1 kernel threads

uTime start = uClock::currTime();
mergesort( ... );
cout << "Sort time " << uClock::currTime() - start << " sec." << endl;