There are two kinds of quotations: forced and unforced. Unforced quotations have an expression and an environment; forced quotations have an expression and a value.
forced(q)
tests whether a quotation is forced.
forced(d)
on a dots object tests whether each element
is forced, and returns a logical vector.
forced_quo(x)
forces its argument and then captures it.
argument literally.
forced_quo_(x)
makes a forced quotation from any data.
Specifically it constructs a quotation with the same object in
both the expr
and value
slots, except if is a
language object in which case the value is wrapped
in quote()
.
forced_dots(...)
forces its arguments and emits a dots
object.
force_(x)
converts an unforced quotation or dots object into a
forced one, by evaluating it.
value
or values
returns the value of a quotation or dots,
forcing it if necessary.
forced(x)# S3 method for quotation
forced(x, ...)
# S3 method for dots
forced(x)
# S3 method for default
forced(x)
forced_quo(x)
forced_quo_(x)
forced_dots(...)
force_(x, ...)
# S3 method for quotation
force_(x, eval = base::eval, ...)
# S3 method for dots
force_(x, ...)
value(x, ...)
# S3 method for quotation
value(x, mode = "any", ...)
# S3 method for dots
value(x, ...)
values(x)
# S3 method for dots
values(x)
any number of arguments; they will be quoted literally.
Which evaluation function to use.
Whether to force in "any" mode or "function" mode (see locate).
forced(x)
returns a logical.
forced_quo
and forced_quo_
return quotation
objects.
forced_dots
and forced_dots_
return dots objects.
value(x)
returns the result of forcing the quotation.
values
returns a list.