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

[devonrevenge]

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

[vlad from moscow]

It means that class 'class' has no the definition of the constructor class( int ). That is such constructor is declared but not defined.