I'm doing some chemistry/physics stuff, and have written 5 OO modules. Four of them inherit from the fifth. Materia::Variable is the base (which inherits from the CPAN module Number::WithError), and the other 4 are: Materia::Variable::Generic, Materia::Variable::Pressure, Materia::Variable::Temperature and Materia::Variable::PressureTemperature.

The 4 sibling modules use base qw(Materia::Variable), which I believe is the correct thing.

At the beginning of a program which uses these 4 modules, I have the 4 use Materia::Variable::... statements. A little ways into the program, the first object I make happens to be ...Generic. It works fine. The next line tries to create a ...Pressure object. And I get:

Can't locate object method "new" via package "Materia::Variable::Pressure" ...

The new methods in all of these classes do very little. Most of the work is done in an _init() method in the base class. @INC includes the directory where all this stuff lives. How come it is forgetting that the module exists? How do you debug this? Single stepping in emacs/perldb is getting me nowhere.

Thanks.

In reply to OO: short memory? by Anonymous Monk

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