QFlags with std::initializer_list

[TorAn]

I am having a problem with QFlags class. Here is an pseudo-code example. I'll appreciate any comment/advise. Thanks.

class A {
... 
public:
    enum class SignalState {ENTRY, EXIT};
...
};
 
class B {
public:
    Q_DECLARE_FLAGS(SignalUsage, A::SignalState)
    B ()  : usage(A::SignalState::ENTRY | A::SignalState::EXIT) // fails
    {
    }
    B (int)  : usage(std::initializer_list<SignalUsage>({A::SignalState::ENTRY, A::SignalState::EXIT}) // fails
    {
    }
    B (char)  : usage(A::SignalState::ENTRY) // compiles
    {
         usage |= A::SignalState::EXIT; // compiles
    }
private:
    SignalUsage usage;
}

class A {
... 
public:
    enum class SignalState {ENTRY, EXIT};
...
};

class B {
public:
    Q_DECLARE_FLAGS(SignalUsage, A::SignalState)
    B ()  : usage(A::SignalState::ENTRY | A::SignalState::EXIT) // fails
    {
    }
    B (int)  : usage(std::initializer_list<SignalUsage>({A::SignalState::ENTRY, A::SignalState::EXIT}) // fails
    {
    }
    B (char)  : usage(A::SignalState::ENTRY) // compiles
    {
         usage |= A::SignalState::EXIT; // compiles
    }
private:
    SignalUsage usage;
}

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[d_stranz]

Try removing the "class" scoping on your definition of SignalState. It is possible that the Q_DECLARE_FLAGS() macro is not generating the correct code for this level of C++11 compliance. You can simulate scoping the old-fashioned way: SS_ENTRY, SS_EXIT.