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\par
\section{Data Structure}
\label{section:IV:dataStructure}
\par
\par
The {\tt IV} structure has four fields.
\begin{itemize}
\item
{\tt int size} : present size of the vector.
\item
{\tt int maxsize} : maximum size of the vector.
\item
{\tt int owned} : owner flag for the data.
When {\tt owned = 1}, storage for {\tt maxsize} {\tt int}'s
has been allocated by this object and can be free'd by the object.
When {\tt nowned = 0} but {\tt maxsize > 0}, this object points to
entries that have been allocated elsewhere, and these entries will
not be free'd by this object.
\item
{\tt int *vec} : pointer to the base address of the {\it int} vector
\end{itemize}
The {\tt size}, {\tt maxsize}, {\tt owned} and {\tt vec} fields
need never be accessed directly ---
see the
{\tt IV\_size()},
{\tt IV\_maxsize()},
{\tt IV\_owned()},
{\tt IV\_entries()},
{\tt IV\_sizeAndEntries()} methods.
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