Reports whether or not a character set contains at least one member character in the specified plane.
- iOS 2.0+
- macOS 10.2+
- tvOS 9.0+
- watchOS 2.0+
- Core Foundation
The character set to examine.
The plane number to be checked for the membership. The valid value range is from 0 to 16. If the value is outside of the valid plane number range, the behavior is undefined.
true if at least one member character is in the specified plane, otherwise