Coerce object to quosure
While new_quosure()
wraps any R object (including expressions,
formulas, or other quosures) into a quosure, as_quosure()
converts formulas and quosures and does not double-wrap.
as_quosure(x, env = NULL) new_quosure(expr, env = caller_env())
x |
An object to convert. Either an expression or a formula. |
env |
The environment in which the expression should be evaluated. Only used for symbols and calls. This should typically be the environment in which the expression was created. |
expr |
The expression wrapped by the quosure. |
as_quosure()
now requires an explicit default environment for
creating quosures from symbols and calls.
as_quosureish()
is deprecated as of rlang 0.2.0. This function
assumes that quosures are formulas which is currently true but
might not be in the future.
# as_quosure() converts expressions or any R object to a validly # scoped quosure: env <- env(var = "thing") as_quosure(quote(var), env) # The environment is ignored for formulas: as_quosure(~foo, env) as_quosure(~foo) # However you must supply it for symbols and calls: try(as_quosure(quote(var)))
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