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Message: [QUOTE="Bart van Ingen Schenau, post: 4181741"] Why? What good is it to declare an operator= on a class that is not supposed to support assignment? This operator= should be left out completely. As _Low_Byte_Const has a reference-type member (m_data), the compiler will not be able to generate an operator= and that is exactly the behaviour you want. This operator= should be left out as well. You don't want to support assignment of an integer, so you should not provide any operators that would be used in such an assignment. No. If the function itself does not modify *this and is also does not pass pointers or references to other functions that might cause modification of *this, then it is sufficient to have only one, const-qualified, function. This function can be used both by const and non-const objects. Bart v Ingen Schenau [/QUOTE]