You should use memcpy() only for copying POD (plain old data) types, but not class objects. For copying objects, use their assignment operator or the std::copy() algorithm. Remember also that the pointers passed to memcpy() must point to non-overlapping variables; otherwise, the results are undefined:
struct A{ int n;};A a;memcpy(&a, &a, sizeof(A));//overlapping pointers; undefined
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