delayed evaluation and environments

[piccolbo]

delayed evaluation and environments

[piccolbo]

This is a function that can make a copy by value at least the first enclosing environment. A recursive version is left as an exercise for the reader, and may be too costly computationally. This may cover most use cases

protect = 
    function(x) {
        envx= environment(x)
        nenv = as.environment(as.list(envx))
        parent.env(nenv) = parent.env(envx)
        environment(x) = nenv
        x}

[piccolbo]

protect is now implemented, need to test more before closing

[piccolbo]

still broke

[piccolbo]

delta = 0
ff = function()function(x) x$carb + delta #two deep env created
p = do(input(mtcars), ff())
as.data.frame(p)
delta  =  100
as.data.frame(p)
p = do(input(mtcars), ff())
as.data.frame(p)

rejoice!
works also for where and select, not for mutate or transform. It may be the most we can do so I am going to close for now. If someone has an idea as to get the ... args of these other function evaluated in an environment of choice, please let me know.