Determine the hash and class of a varaible based on the most recent ouput values for that variable captured as a previous output. Not intended for direct use by end users.
cback1(invar, prevouts, prevouthashes, prevoutclasses)The variable to find
Previous output variables
Hashes for the previous output variables
Classes for the previous output variables
a list containing the hash and class of the variable.
If the variable is not found in the previous outputs, the .Global environment is inspected for a current value of the variable. This is necessary to capture things that can show up via lazyloading without ever being an output v, e.g., the mtcars dataset.