what does 'undefined reference to class::class(int)' mean (where class is the class name))'

this is the error im getting but the question ive asked to work out the problem is on another thread, i have had the error message planty of times before with experimenting what does it normally mean, it may help me fix my problem elswhere
It means that class 'class' has no the definition of the constructor class( int ). That is such constructor is declared but not defined.
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