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[class.mi] Define ambiguous/unambiguous base class #7306

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[class.mi] Define ambiguous/unambiguous base class #7306

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21 changes: 21 additions & 0 deletions source/classes.tex
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Expand Up @@ -3654,6 +3654,27 @@
\end{importgraphic}
\end{note}

\pnum
\indextext{base class!ambiguous}%
\indextext{base class!unambiguous}%
If an object of class \tcode{D} has a single base class subobject of type \tcode{B},
\tcode{B} is an \defnadj{unambiguous}{base class} of \tcode{D}.
If an object of class \tcode{D} has more than one base class subobject of type \tcode{B},
\tcode{B} is an \defnadj{ambiguous}{base class} of \tcode{D}.
\begin{example}
\begin{codeblock}
class B { @\commentellip@ };
class MX : public B { @\commentellip@ };
class MY : public B { @\commentellip@ };
class D1 : public MX, public MY { @\commentellip@ }; // \tcode{B} is an ambiguous base class of \tcode{D1}
class D2 : public MX, public B { @\commentellip@ }; // \tcode{B} is an ambiguous base class of \tcode{D2}

class VMX : virtual public B { @\commentellip@ };
class VMY : virtual public B { @\commentellip@ };
class D3 : public VMX, public VMY { @\commentellip@ }; // \tcode{B} is an unambiguous base class of \tcode{D3}
\end{codeblock}
\end{example}

\rSec2[class.virtual]{Virtual functions}%
\indextext{function!virtual|(}%
\indextext{type!polymorphic}%
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