StackOverflow2013

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plurals

PO
primarykey
Id
20717988
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
1
CommunityOwnedDate
CreationDate
2013-12-21T10:29:18.283
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2013-12-21T11:07:10.567
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2013-12-21T11:07:10.567
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1873944
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1873944
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20717526
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2
Score
7
ViewCount
0
LastEditorDisplayName
text
Body
It's possible, but C++ prevents passing the OR in the way you're doing it. The problem is that <code>connect</code> takes an argument of type <code>Qt::ConnectionType</code>. Bitwise OR'ing two values from an enum produces a value of type <code>int</code> (the enum values undergo integer promotion in order to apply the bitwise OR operator). This causes the compile error you're getting: <blockquote> cannot convert parameter 5 from 'int' to 'Qt::ConnectionType' </blockquote> (Remember that in C++ integrals don't automatically convert into enums). So the solution is casting back the result of the OR into the right type, and the right cast to use is <code>static_cast</code>: <pre><code>static_cast<Qt::ConnectionType>(Qt::QueuedConnection | Qt::UniqueConnection) </code></pre> <hr> Now you might ask "why didn't Qt authors think about this"? Well, the fact is that <code>Qt::UniqueConnection</code> has been added in Qt 4.6. Before, <code>connect</code> only took a single enum value, not an OR combination of them. That's why <code>connect</code> has this signature: <pre><code>connect(..., Qt::ConnectionType) </code></pre> and not something like this: <pre><code>connect(..., QFlags<Qt::ConnectionType>) connect(..., int) </code></pre> which instead would've allowed the OR. (Note that these latter two signatures also allow for things such as <code>Qt::DirectConnection | Qt::QueuedConnection</code>, which don't make sense).
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1. POQt: Specifying multiple connection types with QObject::connect
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1. PTAnswer
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1. USpeppe
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1. USpeppe
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