These accessors retrieve properties of frames on the call stack. The prefix indicates for which frame a property should be accessed:
From the current frame with current_ accessors.
From a calling frame with caller_ accessors.
From a matching frame with frame_ accessors.
The suffix indicates which property to retrieve:
_fn accessors return the function running in the frame.
_call accessors return the defused call with which the function
running in the frame was invoked.
_env accessors return the execution environment of the function
running in the frame.
current_call()current_fn()
current_env()
caller_call(n = 1)
caller_fn(n = 1)
caller_env(n = 1)
frame_call(frame = caller_env())
frame_fn(frame = caller_env())
The number of callers to go back.
A frame environment of a currently running function,
as returned by caller_env(). NULL is returned if the
environment does not exist on the stack.
caller_env() and current_env()