why scoped enum support operator < by default

why scoped enum support operator < by default

My understanding is that scoped enum needs to be cased into underlying type or integer then it can be applied to operator &lt; &gt; ==. But it looks code snippet above can work w/o any explicit overloadding operator &lt;.

enum class Number {one , two};
if (Number::one < Number::two)
{}

My understanding is that scoped enum needs to be cased into underlying type or integer then it can be applied to operator < > ==. But it looks code snippet above can work w/o any explicit overloadding operator <.

I don't see any descriptions in https://en.cppreference.com/w/cpp/language/enum

Anyone can point me how C++ standard says which operators are supported for scoped enum by default?

c++

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