[Main]
Name=GrayOnThrow
Type=Function
Subtype=tigcc.a
Header Files=gray.h
Definition=void GrayOnThrow (void);
See Also=GrayOn, GrayOff, error.h/

[Library Call]
Asm=1

[Description]
Activates grayscale mode, throwing an error if unsuccessful.

[Explanation]
GrayOnThrow works like <A HREF="$$LINK(GrayOn)">GrayOn</A>, except that it
throws an error if it could not turn on grayscale successfully.

[References]
Out=GrayOn
