contents: Returns or changes parcel contents
In hughjonesd/refset: Subsets with Reference Semantics

Description Usage Arguments Value See Also Examples

contents returns the value of the parcel contents by evaluating the expression in the parcel. contents<- attempts to assign to the expression, which will only work if the expression is appropriate, e.g. a refset.

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contents(parcel)

contents(parcel) <- value

`parcel`	an object of class 'parcel'
`value`	a value to assign

The result of evaluating the expression stored in the parcel. For contents<-, the parcel itself.

contents<- will only work if the expression wrapped in the parcel can accept assignments.

Other wrapping functions: is.parcel, unwrap_as, wrapset, wrap

pcl <- wrap(x^2)
x <- 2
contents(pcl)
x <- 3
contents(pcl)
## Not run: 
contents(pcl) <- 4 # fails

## End(Not run)
p2 <- wrap(names(x))
contents(p2) <- "named"
x