Lock or unlock environment bindings

Locked environment bindings trigger an error when an attempt is made to redefine the binding.

env_binding_lock(env, nms = NULL)

env_binding_unlock(env, nms = NULL)

env_binding_are_locked(env, nms = NULL)

Arguments

env	An environment.
nms	Names of bindings. Defaults to all bindings in env.

Value

env_binding_are_unlocked() returns a logical vector as long as nms and named after it. env_binding_lock() and env_binding_unlock() return the old value of env_binding_are_unlocked() invisibly.

See also

env_lock() for locking an environment.

Examples

# Bindings are unlocked by default:
env <- env(a = "A", b = "B")
env_binding_are_locked(env)
#>     a     b 
#> FALSE FALSE 

# But can optionally be locked:
env_binding_lock(env, "a")
env_binding_are_locked(env)
#>     a     b 
#>  TRUE FALSE 

# If run, the following would now return an error because `a` is locked:
# env_bind(env, a = "foo")
# with_env(env, a <- "bar")

# Let's unlock it. Note that the return value indicate which
# bindings were locked:
were_locked <- env_binding_unlock(env)
were_locked
#>     a     b 
#>  TRUE FALSE 

# Now that it is unlocked we can modify it again:
env_bind(env, a = "foo")
with_env(env, a <- "bar")
env$a
#> [1] "bar"