[Qt-interest] Plugin fails to load if I use singleton pattern

[Andreas Unger]

Hi all,

I have a plugin and a main singleton class, let's call it test. Test has a
method static Test * instance().

My plugin is loaded fine (it's loaded in the Test class) if I declare a
private Test* variable and initialize it in the plugin constructor or using
a setter method.

However, if I avoid using a private Test * variable in the plugin and use
Test::instance() to access the methods in the Test class, I get an undefined
symbol error.  Why is this the case?

Regards,
Andreas
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