track_copy: Track if an object is copied

In hadley/pryr: Tools for Computing on the Language

Track if an object is copied

Description

The title is somewhat misleading: rather than checking if an object is modified, this really checks to see if a name points to the same object.

Usage

track_copy(var, env = parent.frame(), quiet = FALSE)

Arguments

var	variable name (unquoted)
env	environment name in which to track changes
quiet	if FALSE, prints a message on change; if FALSE only the return value of the function is used

Value

a zero-arg function, that when called returns a boolean indicating if the object has changed since the last time this function was called

Examples

a <- 1:5
track_a <- track_copy(a)
track_a()
a[3] <- 3L
track_a()
a[3] <- 3
track_a()
rm(a)
track_a()

hadley/pryr documentation built on Jan. 5, 2024, 10:38 a.m.