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In this recent question, we saw that it's not allowed to reinterpret_cast some custom class type instance to itself; struct A{}; reinterpret_cast<A>(A{}); is invalid (it works only through references or pointers). Which seems to make sense, because of the lack of real-world scenarios where such identity conversion is necessary.

Checking the corresponding standard clause, we have in [expr.reinterpret.cast] (emphasis mine):

1 [...] Conversions that can be performed explicitly using reinterpret_­cast are listed below. No other conversion can be performed …