Yu:
classFracturePhaseFieldProblem
{
public:
…
private:
…
void output_results () const;
class Postprocessor;
This is what's called a "forward declaration". The line really just says
"There is a class Postprocessor" but because you don't provide the
details in a {...} block, the compiler knows nothing about it.
…
};
However when I want to declare a variable as the type
FracturePhaseFieldProblem<2>::Postprocessor in functionoutput_results
(),I got the error:
error: cannot declare variable ‘postprocessor’ to be of abstract type
‘FracturePhaseFieldProblem<2>::Postprocessor’
And here the compiler is telling you "You're trying to create a variable
of this type. I know is that the class *exists*, but in order to create
a variable of this type, I need to know *what the class does* and what
its member variables are".
Best
W.
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