"vicente.botet" <vicente.botet@wanadoo.fr> writes:
Well let me come back to my initial example. Supose that I had Result f(InOut& ref); // ... { InOut v=0; // ... v = 13; Result r = f(v); // ... use r or v; g(r, v); v = 15; }
Do you mean that the following works with your proposal?
unique_future<Result> f(shared_future<InOut>& ref); // ... { shared_future<InOut> v; v->get()=0; // ... v->get() = 13; unique_future<Result> r = f(v); // ... use r or v; g(r->get(), v->get()); v->get() = 15; }
Not quite. You can't set a value on a future by writing to the result of a call to get() - you need a promise or a packaged task for that. However, you can write: void foo() { promise<InOut> p; shared_future<InOut> v=p.get_future(); p.set_value(13); unique_future<Result> r=f(v); // v.get() may have changed if f took v by reference g(r.get(),v.get()); } Anthony -- Anthony Williams | Just Software Solutions Ltd Custom Software Development | http://www.justsoftwaresolutions.co.uk Registered in England, Company Number 5478976. Registered Office: 15 Carrallack Mews, St Just, Cornwall, TR19 7UL