Why so many header file have no other functions besides Constructor function

hello everyone

why the following flies only have Constructor function,and no other functions,how can i use this class?

StepDimTol_ParallelismTolerance.hxx
StepDimTol_RoundnessTolerance.hxx
StepDimTol_PositionTolerance.hxx
StepDimTol_LineProfileTolerance.hxx
StepDimTol_CylindricityTolerance.hxx
...

thanks

m-aronsson's picture

They are subclasses of other classes that does have methods, I assume that they exist simply beacuse they need to be able to tell the difference between them.