You Can Modify the Private Internals of a Class in Java

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You Can Modify the Private Internals of a Class
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Changes to private class methods that are not exported and are not virtual do not break client compatibility Likewise for protected methods in a class which is not derivable However, the functions must not be called by externally-accessible inline methods, since the call inside the inline method would be compiled into external calling code and would be broken by an incompatible change to the internals of the class As I discuss in 21, it is general good practice to restrict, or eliminate, the use of publicly-accessible inline functions, particularly where compatibility is an issue This is also discussed further in Section 186 Changes to private class member data are also permissible, unless it results in a change to the size of the class object or moves the position of public or protected data in the class object (exposed directly, through inheritance or through public inline accessor methods)
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You Can Relax Access Speci cation
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The C++ access speci er (public, protected, private) doesn t affect the layout of a class and can be relaxed without affecting the data order
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3 You should endeavor to avoid any name clashes within the component or others in the global namespace otherwise the change will be source-incompatible
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COMPATIBILITY
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of the object The position of member data in a class object is determined solely by the position of the data as it is speci ed in the class de nition It is not sensible to change the access speci cation to a more restricted form, eg from public to private, because, although it does not affect the code, it means that the member data becomes invisible to external clients when previously it was visible A future change to the component might incorrectly assume that the data has always been private and modify its purpose, affecting external components dependent upon it In addition, any existing client which accesses that data will no longer be able to do so a source-incompatible change
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You Can Substitute Pointers for References and Vice Versa
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Changing from a pointer to a reference parameter or return type (or vice versa) in a class method does not break binary compatibility This is because references and pointers can be considered to be represented in the same way by the C++ compiler
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You Can Change the Names of Exported Non-Virtual Functions
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Symbian OS is linked purely by ordinal and not by name and signature This means that it is possible to make changes to the name of exported functions and retain binary, if not source, compatibility
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You Can Widen the Input
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Input can be made more generic ( widened ) as long as input that is currently valid retains the same interpretation Thus, for example, a function can be modi ed to accept a less derived pointer4 or extra values can be added to an enumeration, as long as it is extended rather than re-ordered, which would change the original values
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Output can be made less generic ( narrowed ) as long as any current output values are preserved For example, the return pointer of a function can be made more derived as long as the new return type applies to the original return value5 For multiple inheritance, say, a pointer to a class is unchanged when it is converted to a pointer to the rst base class in
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4 Say class CSiamese derives from class CCat If the pointer passed to a function was originally of type CSiamese, it is acceptable to change the function signature to take a pointer to the less-derived CCat type 5 Using the same example of class CSiamese which derives from CCat, if the pointer returned from a function was originally of type CCat, it is acceptable to change the function signature to return a pointer to the more-derived CSiamese type
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