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Bug
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Resolution: Fixed
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P2: Important
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6.2.0
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8
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Team 1 Foundation_Sprint 46
I would have expected something like this to work:
QPromise<int> p;
auto f = p.future().then([](int i){ return i; }).onCanceled([]{ qDebug("canceled"); return -1; });
p.start();
f.cancel();
p.addResult(1);
p.finish();
f.result();
But it just hangs in the result() and onCanceled handler is not called.
This works however:
QPromise<int> p;
auto original = p.future();
auto f = original.then([](int i){ return i; }).onCanceled([]{ qDebug("canceled"); return -1; });
p.start();
original.cancel();
p.addResult(1);
p.finish();
f.result();
So it looks like cancel() call to the future returned by then/onCanceled/onFailed does not propagate to the original QFuture.
| For Gerrit Dashboard: QTBUG-97582 | ||||||
|---|---|---|---|---|---|---|
| # | Subject | Branch | Project | Status | CR | V |
| 378262,20 | Update documentation of QFuture continuations | dev | qt/qtbase | Status: MERGED | +2 | 0 |
| 380747,11 | QFuture: support cancellation of continuation chain through parent | dev | qt/qtbase | Status: MERGED | +2 | 0 |
| 380748,4 | QFuture: extend the docs to explain how to cancel continuation chain | dev | qt/qtbase | Status: MERGED | +2 | 0 |
| 381313,2 | Update documentation of QFuture continuations | 6.2 | qt/qtbase | Status: MERGED | +2 | 0 |
| 383997,3 | QFuture: support cancellation of continuation chain through parent | 6.2 | qt/qtbase | Status: MERGED | +2 | 0 |
| 383998,3 | QFuture: extend the docs to explain how to cancel continuation chain | 6.2 | qt/qtbase | Status: MERGED | +2 | 0 |