Use relationship

There is a number of use relationships represented in C++. Each of them introduce some dependency between the client code (which uses the other) and the code which was used.

• Using a name. This is the smallest dependency, not even necessery to use the declaration.
• Calling a member function
• Reading a member
• Writing a member
• Creating an object
• Taking the size of an object. This needs to know the declaration but doesn't depend on the constructor.

It is always a good idea to minimalize the dependencies between the different parts of the code.