How to get member function address for local class defined in function (C ++)

Question

I am trying to do the following: get the address of a member function from a class locally defined inside the function.

class ConnectionBase
{
};

template class<EventType, SinkType>
class ConnectionImpl : public ConnectionBase
{
public:
typedef void (SinkType::*EventCallback)(EventType const&);
};


template<class EventType>
class Source
{
    template <class SinkType>
    boost::shared_ptr<ConnectionBase> setupCallback(typename ConnectionImpl<EventType, SinkType>::EventCallback func, SinkType* sink)
    {
    // do the actual connecting.
    }
};

class SomeClass
{
public:
    void someFunction(int const& event){}
}

class SomeUnitTest
{
public:
    void someTest()
    {
        class NestedClass 
        {
        public:
            void someFunction(int const& event){}
        };

       NestedClass nc;

       //Try#1 - This does not work
       setupCallback<int, NestedClass>(&NestedClass::someFunction, &nc);

       //Try #2 - This also does not work
       setupCallback<int, NestedClass>(&SomeUnitTest::someTest::NestedClass::someFunction, &nc);

       //Try #3 - Following the GCC error output, I tried this
       setupCallback<int, NestedClass>(&SomeUnitTest::someTest()::NestedClass::someFunction, &nc);

       SomeClass sc;

       //This works fine, as expected
       setupCallback<int, SomeClass>(&SomeClass::someFunction, &sc);

    }
};

Try # 2 and # 3 to completely confuse GCC, it doesn't know what I'm trying to do. Try # 1 produces a more useful error message saying that no setupCallback exists, which takes the form "setupCallback (void (SomeUnitTest :: someTest () :: NestedClass :: SomeFunction :: *), etc.) This is how it was born attempt number 3.

I cannot find much information about classes defined inside a function, does anyone know the correct syntax for this, and maybe there is a resource discussing this issue?

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Answer 1

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Answer 2

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