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[namespace.udecl] Clarify error in example. #1254

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Feb 4, 2017
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[namespace.udecl] Clarify error in example. #1254

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12 changes: 8 additions & 4 deletions source/declarations.tex
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Original file line number Diff line number Diff line change
Expand Up @@ -3057,12 +3057,15 @@
member function, then all functions named shall be accessible. The base
class members mentioned by a \grammarterm{using-declarator} shall be
visible in the scope of at least one of the direct base classes of the
class where the \grammarterm{using-declarator} is specified. \begin{note}
class where the \grammarterm{using-declarator} is specified.

\pnum
\begin{note}
Because a \grammarterm{using-declarator} designates a base class member
(and not a member subobject or a member function of a base class
subobject), a \grammarterm{using-declarator} cannot be used to resolve
inherited member ambiguities. For example,

inherited member ambiguities.
\begin{example}
\begin{codeblock}
struct A { int x(); };
struct B : A { };
Expand All @@ -3076,9 +3079,10 @@
int x(double);
};
int f(D* d) {
return d->x(); // ambiguous: \tcode{B::x} or \tcode{C::x}
return d->x(); // error: overload resolution selects \tcode{A::x}, but \tcode{A} is an ambiguous base class
}
\end{codeblock}
\end{example}
\end{note}

\pnum
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