All constructors except the copy constructor of std::chrono::duration are defined as constexpr. Why the copy constructor can't be defined as constexpr as well?
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Whether it can be constexpr or not depends on some internal details. From the language standard:
The defaulted copy constructor of duration shall be a constexpr function if and only if the required initialization of the member rep_ for copy and move, respectively, would satisfy the requirements for a constexpr function.
So it will be constexpr if the internal representation of the class will allow it.
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