20
Library introduction
[library]
20.5
Library-wide requirements
[requirements]
20.5.5
Conforming implementations
[conforming]
20.5.5.10
Protection within classes
[protection.within.classes]
1
#
It is unspecified whether any function signature or class described in Clauses
[language.support]
through
[thread]
and Annex
[depr]
is a
friend
of another class in the C++ standard library
.