C++ 概念： TriviallyCopyable
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- No virtual functions or virtual base classes
- All (non-static) members and base classes are TriviallyCopyable
- Other than the other requirements, trivial constructor, assignment and destructor must be defined implicitly (not user-provided)
- Scalar types and arrays of TriviallyCopiable objects are TriviallyCopiable as well
| checks if a type is trivially copyable |