Detect if cursor is hidden on Mac OS X

Is there a programmatic, non-private-API way to detect whether the mouse cursor is hidden on Mac OS X? (As occurs, for example, when typing into开发者_StackOverflow a text field.)

NSCursor has hide and unhide but no isHidden. I'm wondering if there is some other API which might do what I want. C-based APIs are fine.

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Try CGCursorIsVisible() (returns a BOOL).