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The differences to run() method:
1. The passed function should have additional
argument QPromise<T> &, declared as a first argument.
2. The return value of the function must be void.
Result reporting should be done through
passed QPromise<T> &promise argument.
3. By default, runWithPromise() doesn't support functors
with overloaded operator()().
In case of overloaded functors the user
needs to explicitly specify the result type
as a template parameter passed to runWithPromise,
like:
struct Functor {
void operator()(QPromise<int> &) { }
void operator()(QPromise<double> &) { }
};
Functor f;
runWithPromise<double>(f); // this will select the 2nd overload
Task-number: QTBUG-84702
Change-Id: Ie40d466938d316fc46eb7690e6ae0ce1c6c6d649
Reviewed-by: Sona Kurazyan <sona.kurazyan@qt.io>
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