pub type SecTransformInstanceBlock = *mut DynBlock<dyn Fn() -> *mut CFError>;Available on crate features
SecCustomTransform and block2 only.Expand description
This is the block that is returned from an implementation of a CreateTransform function.
Returns: A CFErrorRef if an error occurred or NULL.
The instance block that is returned from the developers CreateTransform function, defines the behavior of a custom attribute. Please see the example at the head of this file.
See also Apple’s documentation