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<BLOCKQUOTE>
<H1><A NAME="NAME"><A NAME="1">NAME
</A></A></H1>
<P>
<B>cgGetParentType</B> - gets a parent type of a child type
</P>
<H1><A NAME="SYNOPSIS"><A NAME="2">SYNOPSIS
</A></A></H1>
<PRE> #include <Cg/cg.h>
CGtype cgGetParentType( CGtype type,
int index );
</PRE>
<H1><A NAME="PARAMETERS"><A NAME="3">PARAMETERS
</A></A></H1>
<DL>
<DT><STRONG>type
</STRONG></DT>
<DD>
<P>
The child type.
</P>
<DT><STRONG>index
</STRONG></DT>
<DD>
<P>
The index of the parent type. <B>index</B> must be greater than or equal to <B>0</B>
and less than the value returned by <A HREF="cgGetNumParentTypes.html">cgGetNumParentTypes</A>.
</P>
</DD></DL>
<H1><A NAME="RETURN_VALUES"><A NAME="4">RETURN VALUES
</A></A></H1>
<P>
Returns the number of parent types.
</P>
<P>
Returns <B>NULL</B> if there are no parents.
</P>
<P>
Returns <B>CG_UNKNOWN_TYPE</B> if <B>type</B> is a built-in type or an error is thrown.
</P>
<H1><A NAME="DESCRIPTION"><A NAME="5">DESCRIPTION
</A></A></H1>
<P>
<B>cgGetParentType</B> returns a parent type of <B>type</B>.
</P>
<P>
A parent type is one from which the given type inherits, or
an interface type that the given type implements. For example,
given the type definitions:
</P>
<PRE> interface myiface {
float4 eval(void);
};
struct mystruct : myiface {
float4 value;
float4 eval(void ) { return value; }
};
</PRE><P>
<B>mystruct</B> has a single parent type, <B>myiface</B>.
</P>
<P>
Note that the current Cg language specification implies
that a type may only have a single parent type -- an interface
implemented by the given type.
</P>
<H1><A NAME="EXAMPLES"><A NAME="6">EXAMPLES
</A></A></H1>
<P>
<I>to-be-written</I>
</P>
<H1><A NAME="ERRORS"><A NAME="7">ERRORS
</A></A></H1>
<P>
<B>CG_OUT_OF_ARRAY_BOUNDS_ERROR</B> is generated if <B>index</B> is outside the
proper range.
</P>
<H1><A NAME="HISTORY"><A NAME="8">HISTORY
</A></A></H1>
<P>
<B>cgGetParentType</B> was introduced in Cg 1.2.
</P>
<H1><A NAME="SEE_ALSO"><A NAME="9">SEE ALSO
</A></A></H1>
<P>
<A HREF="cgGetNumParentTypes.html">cgGetNumParentTypes</A>
</P>
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