[expr.reinterpret.cast] p2 The meaning of "its own type" is not clear

[xmh0511]

[expr.reinterpret.cast] p2 says

An expression of integral, enumeration, pointer, or pointer-to-member type can be explicitly converted to its own type; such a cast yields the value of its operand.

What does "its own type" mean? Does it mean the identical original type or something else? Consider this example:

reinterpret_cast<int>(10);
reinterpret_cast<int const>(10);
reinterpret_cast<int volatile>(10);
reinterpret_cast<int const volatile>(10);

Both GCC and Clang accept this example. I think such a conversion is intended to be regulated by [expr.reinterpret.cast] p2. Because p1 says

Conversions that can be performed explicitly using reinterpret_­cast are listed below. No other conversion can be performed explicitly using reinterpret_­cast.

Except that p2 might be relevant to this example, all other rules are irrelevant to the above example. It is necessary to clarify what "its own type" means. Presumably, it means

An expression of integral, enumeration, pointer, or pointer-to-member type can be explicitly converted to the cv-unqualified version or cv-qualification of that type.

[JohelEGP]

How about

An expression of type T, where T is an integral, enumeration, pointer, or pointer-to-member type, can be explicitly converted to cv T.

[xmh0511]

How about

An expression of type T, where T is an integral, enumeration, pointer, or pointer-to-member type, can be explicitly converted to cv T.

Looks good and is concise.

[frederick-vs-ja]

It seem better to me to specify that if the target type of an explicit cast expression is a scalar or cv void, the top-level cv-qualification is removed first (rather than after the cast). Then only cv-unqualified scalar prvalue will be converted to cv-unqualified target types here, which is perfectly fine.