Instantiates a qenv environment.
qenv class has following characteristics:
It inherits from the environment and methods such as $, get(), ls(), as.list(), parent.env() work out of the box.
qenv is a locked environment, and data modification is only possible through the eval_code() and within.qenv() functions.
It stores metadata about the code used to create the data (see get_code()).
It supports slicing (see subset-qenv)
It is immutable which means that each code evaluation does not modify the original qenv environment directly. See the following code:
q1 <- qenv()
q2 <- eval_code(q1, "a <- 1")
identical(q1, q2) # FALSEq <- qenv()
q2 <- within(q, a <- 1)
ls(q2)
#> [1] "a"
q2$a
#> [1] 1
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