bkietz commented on pull request #8582:
URL: https://github.com/apache/arrow/pull/8582#issuecomment-724120890
The specific function I had in mind to write is
```c++
/// execute continuation using a specific Executor
Future<U> Future<T>::Then(Executor* where, Continuation&& continuation) {
return Then([where, continuation](const Result<U>& res) {
// currently not possible because in future.h Executor::Submit is
unavailable:
return DeferNotOk(where->Submit(bind(continuation, res)));
});
}
```
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