cgGetParentType

> # NAME

> cgGetParentType - gets a parent type of a child type

> # SYNOPSIS

>       #include <Cg/cg.h>

>       CGtype cgGetParentType( CGtype type,
>                               int index );

> # PARAMETERS

> type

>   The child type.

> index

>   The index of the parent type. index must be greater than or equal to 0 and less than the value returned by cgGetNumParentTypes.

> # RETURN VALUES

> Returns the number of parent types.

> Returns NULL if there are no parents.

> Returns CG_UNKNOWN_TYPE if type is a built-in type or an error is thrown.

> # DESCRIPTION

> cgGetParentTypes returns a parent type of type.

> 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:

>         interface myiface {
>             float4 eval(void);
>         };

>         struct mystruct : myiface {
>             float4 value;
>             float4 eval(void ) { return value; }
>         };

> mystruct has a single parent type, myiface.

> 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.

> # EXAMPLES

> to-be-written

> # ERRORS

> CG_OUT_OF_ARRAY_BOUNDS_ERROR is generated if index is outside the proper range.

> # HISTORY

> cgGetParentType was introduced in Cg 1.2.

> # SEE ALSO

> cgGetNumParentTypes