> ## Name

> cgIsContext - determine if a context handle references a valid context

> ## Synopsis

>     #include <Cg/cg.h>

>     CGbool cgIsContext( CGcontext context );

> ## Parameters

> context
>   The context handle to check.

> ## Return Values

> Returns CG_TRUE if context references a valid context.

> Returns CG_FALSE otherwise.

> ## Description

> cgIsContext returns CG_TRUE if context references a valid context, CG_FALSE otherwise.

> ## Examples

>     CGcontext context = NULL;
>     cgIsContext(context);        /* returns CG_FALSE */

>     context = cgCreateContext();
>     cgIsContext(context);        /* returns CG_TRUE if create succeeded */

>     cgDestroyContext(context);
>     cgIsContext(context);        /* returns CG_FALSE */

> ## Errors

> None.

> ## History

> cgIsContext was introduced in Cg 1.1.

> ## See Also

> cgCreateContext, cgDestroyContext