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The C++ Standard, [class], paragraph 6 [ISO/IEC 14882-2014], states:

A trivially copyable class is a class that:
  — has no non-trivial copy constructors,
  — has no non-trivial move constructors,
  — has no non-trivial copy assignment operators,
  — has no non-trivial move assignment operators, and
  — has a trivial destructor.
A trivial class is a class that has a default constructor, has no non-trivial default constructors, and is trivially copyable. [Note: In particular, a trivially copyable or trivial class does not have virtual functions or virtual base classes. — end note]

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Bibliography

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