cgIsParameter
Keywords: cgIsParameter, NVIDIA, NVIDIA Cg Toolkit, Cg Toolkit, Shader, Shader Programming, GPU Shader Programming, GPU Program

> ## Name

> cgIsParameter - determine if a parameter handle references a valid parameter

> ## Synopsis

>     #include <Cg/cg.h>

>     CGbool cgIsParameter( CGparameter param );

> ## Parameters

> param
>   The parameter handle to check.

> ## Return Values

> Returns CG_TRUE if param references a valid parameter object.

> Returns CG_FALSE otherwise.

> ## Description

> cgIsParameter returns CG_TRUE if param references a valid parameter object. cgIsParameter is typically used for iterating through the parameters of an object. It can also be used as a consistency check when the application caches CGparameter handles. Certain program operations like deleting the program or context object that the parameter is contained in will cause a parameter object to become invalid.

> ## Examples

>     if (cgIsParameter(param)) {
>       /* do something with param */
>     } else {
>       /* handle situation where param is not a valid parameter */
>     }

> ## Errors

> None.

> ## History

> cgIsParameter was introduced in Cg 1.1.

> ## See Also

> cgGetNextParameter