[protection.within.classes] (original) (raw)

16 Library introduction [library]

16.4 Library-wide requirements [requirements]

16.4.6 Conforming implementations [conforming]

16.4.6.12 Protection within classes [protection.within.classes]

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It is unspecified whether any function signature or class described in[support] through [exec] and [depr] is a friend of another class in the C++ standard library.