_Is_elem_cptr<T> is currently an alias for bool_constant<stuff>. We only ever use it as _Is_elem_cptr<T>::value. It could more simply be a constexpr bool variable template initialized with stuff that we access directly.
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template <class _Iter>
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using _Is_elem_cptr = bool_constant<_Is_any_of_v<_Iter, const _Elem* const, _Elem* const, const _Elem*, _Elem*>>;
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_Is_elem_cptr<T>is currently an alias forbool_constant<stuff>. We only ever use it as_Is_elem_cptr<T>::value. It could more simply be aconstexpr boolvariable template initialized withstuffthat we access directly.STL/stl/inc/xstring
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