construction of classes within classes

[high_flyer]

however as the number of atoms can change each time the class data is instanced i need to dynamically assign the number of atom classes on creation.

In C this would be done with an array, in C++ it is better to use container classes.
See QVector, QList, QSet and probably others.
STL has also a large collection of containers, that differ in various ways.
You should read about it.

However, in your case, QList or QVector would probably be good enough.

QVector<atom *> m_vecAtoms;

QVector<atom *> m_vecAtoms;

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