Returns the class definition of a specified class.
- iOS 2.0+
- macOS 10.0+
- tvOS 9.0+
- watchOS 2.0+
- Objective-C Runtime
The name of the class to look up.
The Class object for the named class.
This function is the same as
objc, but kills the process if the class is not found.
This function is used by ZeroLink, where failing to find a class would be a compile-time link error without ZeroLink.