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P1965R0 Blanket Wording for Specifying "Hidden Friends" #3447

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Nov 21, 2019
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P1965R0 Blanket Wording for Specifying "Hidden Friends" #3447

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23 changes: 23 additions & 0 deletions source/lib-intro.tex
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Expand Up @@ -3122,6 +3122,29 @@
or add additional signatures for a member function name.
\end{note}

\rSec3[hidden.friends]{Friend functions}

\pnum
Whenever this document specifies
a friend declaration of a function or function template
within a class or class template definition,
that declaration shall be
the only declaration of that function or function template
provided by an implementation.
\begin{note}
In particular,
an implementation is not allowed to provide
an additional declaration of that function or function template
at namespace scope.
\end{note}
\begin{note}
Such a friend function or function template declaration
is known as a hidden friend,
as it is visible neither
to ordinary unqualified lookup\iref{basic.lookup.unqual} nor
to qualified lookup\iref{basic.lookup.qual}.
\end{note}

\rSec3[constexpr.functions]{Constexpr functions and constructors}

\pnum
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