BornAgain

To implement #1624 (#1562 is also related), we might have to provide the following

• Turn lots of ISample into ICompositeSample to make possible access to composed members.

like InterferenceFunction2D which should provide access to DecayFunction via tree hierarchy

• include Beam, Detector and many other non-ISample classes into tree hierarchy

to be able to see "wavelength" in a list of fit parameters

• Make possible to notify parent if parameter of child has changed

if we fit parameters of decay function, the parent (i.e. InterferenceFunction) has to be notified to update pre-calculated variables.

Folowing is proposed:

• Remove distinction between ISample and ICompositeSample
• Introduce new “INode” between IParameterized and ISample

INode will be a base class for all items composing a tree hierarchy, with vector of children, and possibly the pointer to the parent.

• Leave ISample with few methods like “containMagneticMaterial”

Steps:¶

• Remove ICompositeSample class

move registerChild() and similar on board of ISample
all ISample will get ICompositeSample functionality

• Introduce INode

An empty class between IParameterized and ISample

• Move registerChild() and Co from ISample on board to INode

• Make INode actually own its children

which is not the case now in the case of ICompositeSample

• Consider making INode to know its parent

to be able to notify parent on parameter change
for automatic remove of INode from parent's children on ~INode() destruction

• Introduce additional callbacks in IParameterized

to notify any possible client about registered parameter change

• Consider getting rid of "double *" in RealParameter in the favor of lambda-like setters