track_copy: Track if an object is copied

Description Usage Arguments Value Examples

View source: R/inspect.r

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

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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

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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 Feb. 20, 2018, 6:11 a.m.