C++ : constexpr(sizeof(T)): Why specify `constexpr` on `sizeof`?

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C++ : constexpr(sizeof(T)): Why specify `constexpr` on `sizeof`?
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C++ : constexpr(sizeof(T)): Why specify `constexpr` on `sizeof`?
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on constexpr(sizeof(T)): `constexpr` specify Why : `sizeof`? C++



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