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POcopyable data class in C++
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copied!<p>Inspired by <a href="http://www.codedread.com/blog/archives/2005/03/23/writing-copyable-c-classes/" rel="nofollow">this article</a>, I have a class which contains a nested copyable data class. This copyable class has no dynamic memory allocation, protect or private for its member class. </p> <pre><code>Class Domain { public: // copyable class struct CopyableDataClass { int i; } void method1(const CopyableDataClass& data){...} void method2(const CopyableDataClass& data){...} } </code></pre> <p>Also, by reading <a href="http://en.wikipedia.org/wiki/Object_copy" rel="nofollow">this Wikipedia page</a>, I could not use dynamic memory allocation for "CopyableDataClass" itself, to avoid the shallow copy, like </p> <pre><code>Domain::CopyableDataClass* p1=new CopyableDataClass(); Domain::CopyableDataClass* p2; p2=p1; </code></pre> <p>But what about the "Domain" Class, is it also special, e.g., can I do it as follows?</p> <pre><code>Class User { public: Domain* getter(); void setter(const Domain* data); private: Domain* m_data; //pointer ok? private ok? } </code></pre> <p>Or I have to put it into public like the copyable class,</p> <pre><code>Class User { public: Domain m_data; } </code></pre> <p>Besides the general class design rule (encapsulation, etc.), is there any constraint (protect/private/dynamic memory allocation) to the usage of this "Domain" class. I guess the constraints only apply to the "Copyable" class. Am I right? </p> <p>Thanks for any comments.</p>

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