undefined reference to `vtable for

[JonB]

@SPlatten
Well, I know nothing about QML or properties or whatever, only about C++, but where do you define storage for (not declare) the static uint16_t m_nextUDN;? If that is missing could it lead to the error? BTW, your topic title does not actually tell us what the full error is....

[SPlatten]

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[SPlatten]

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[JonB]

@SPlatten
OK for the definition! [I'm about to post a question in the C++ Gurus sub-forum about this :) ]

the message is just name space and class name

But are we to assume that is the (correct) namespace & class name specifically for staledata_t?

I think between you, you have solved the issue

However, that appears to not be all, the same message is still reported.

Are these two statements meant to be consistent?

[SPlatten]

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[J.Hilk]

@SPlatten said in undefined reference to `vtable for:

const QString ip() { return m_ip; }

btw, the const here has no meaning. I think you meant to write:

 QString ip() const { return m_ip; }

or

const QString &ip() { return m_ip; }

or

const QString &ip() const { return m_ip; }

;-)

[SPlatten]

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[JoeCFD]

In this case, often you need to make clean and rebuild your project.
in cmake: remove build fold completely. rebuild everything
in qmake: make distclean. then rebuild.

[JoeCFD]

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[J.Hilk]

@SPlatten sooo, what exactly is at line 47 ?

[SPlatten]

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[SPlatten]

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[JonB]

@SPlatten
To be clear: you mean that the file you have been showing us is the config.H file of the error message? And the implementation file is config.cpp which is compiled to config.o. And the line #47

staledata_t() : QObject(nullptr)

is the one just under the public: you show earlier?

[SPlatten]

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[SPlatten]

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[JonB]

@SPlatten
Dunno at this point, a bit difficult to spot with all that's going on. For me I would do the usual: comment "everything" out, preferably including the namespaces, till you get rid of that message. Then add back in....

[J.Hilk]

@SPlatten your class compiles perfectly fine for me, at least as long as I add the implementation of m_nextUDN, where exactly do you do that ?

I know you said/showed, you do it, but where exactly?

[SPlatten]

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[JoeCFD]

Often make clean is not enough especially when cmake is used. Remove the whole build dir and recreate it.

[JonB]

@SPlatten
Yeah, but is that "global scope", i.e. not inside anything else?

@J-Hilk
The trouble is, without m_nextUDN defined properly, I do not get

undefined reference to vtable for asv::scm::helm::staledata_t'

message, I get complaint about m_nextUDN not being defined....