Copy constructor and operator= in composition

[manic thistle]

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[manic thistle]

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[opal magnet]

You don't use inheritance to express a "has-a" relationship in C++, you use members instead.

The default copy constructor copies all the members. Sometimes this is incorrect because you have pointers to something and you need a deep copy. Sometimes you have brick types like std::mutex you can't meaningfully copy at all. It just depends on what makes sense in context.

Since we don't have context we can't really suggest anything specific.