Am 05.10.2012 21:27, schrieb Vicente J. Botet Escriba:
The single difference between both interfaces is that with fist the return is obtained using yield, while in the second is using the operator().
the main difference between version 1 and 2 is that self_t is not a coroutine<> it is a different type. Version 2 was suggested by Giovanni and Eugene - especially Eugene has provided an example demonstrating the benefit of version 2: void player(coroutine<move(move)> opponent, move his, board brd) { while( !brd.is_mate() ) { brd.opponent_move(his); move mine = ...; brd.my_move(mine); his = opponent(mine); } } void white(coroutine<move(move)> opponent) { board brd(WHITE); move mine = ...; brd.my_move(mine); his = opponent(mine); player(opponent, his, board); } void black(coroutine<move(move)> opponent, move his) { board brd(BLACK); player(opponent, his, brd); } void play() { coroutine<move(move)> b(black); white(b); }
I prefer to use yield to return a result and the call operator to call to a coroutine. because slef_t is not of type coroutine<> I expressed the context jump function as 'yield()' instead of operator()
It is not enough clear to me what are the advantages of having a inversed coroutine as parameter. If you use symmetric coroutines - see example above
Anyway, maybe the use of the get accessor can be made more readable without effort using tags
struct a{}; struct b{}; typedef coroutine< int( tagged<int, a>, tagged<int,b> > > coro_t; int fn( coro_t::self_t & c) { int x = c.get< a >(); int y = c.get< b >(); c.yield( x +y); ... }
does boost.tuple provide such a facility? regards, Oliver