is_copyable

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Is an object copyable?

When an object is modified, R generally copies it (sometimes lazily) to enforce valuesemantics. However, some internal types are uncopyable. If you try to copy them, either with <- or by argument passing, you actually create references to the original object rather than actual copies. Modifying these references can thus have far reaching side effects.

Usage
is_copyable(x)
Arguments
x

An object to test.

• is_copyable
Examples
# NOT RUN {
# Let's add attributes with structure() to uncopyable types. Since
# they are not copied, the attributes are changed in place:
env <- env()
structure(env, foo = "bar")
env

# These objects that can only be changed with side effect are not
# copyable:
is_copyable(env)

structure(base::list, foo = "bar")
str(base::list)
# }

Documentation reproduced from package rlang, version 0.1.6, License: GPL-3

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