cback1: cback1

In roprov: Low-Level Support for Provenance Capture Between in-Memory R Objects

Description

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.

Usage

cback1(invar, prevouts, prevouthashes, prevoutclasses)

Arguments

invar	The variable to find
prevouts	Previous output variables
prevouthashes	Hashes for the previous output variables
prevoutclasses	Classes for the previous output variables

Details

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.

Value

a list containing the hash and class of the variable.

roprov documentation built on May 2, 2019, 2:20 a.m.