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[defns.valid] Elaborate on cause in example and add cross-references #7366

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[defns.valid] Elaborate on cause in example and add cross-references #7366

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6 changes: 4 additions & 2 deletions source/intro.tex
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Expand Up @@ -665,8 +665,10 @@
met and operations on the object behave as specified for its type

\begin{example}
If an object \tcode{x} of type \tcode{std::vector<int>} is in a
valid but unspecified state, \tcode{x.empty()} can be called unconditionally,
If an object \tcode{x} of type \tcode{std::vector<int>} enters a
valid but unspecified state through say,
a move operation\iref{lib.types.movedfrom,class.copy.ctor,class.copy.assign},
\tcode{x.empty()} can be called unconditionally,
and \tcode{x.front()} can be called only if \tcode{x.empty()} returns
\tcode{false}.
\end{example}
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