On Tue, Mar 15, 2011 at 10:53 AM, xiagao1982 <xiagao1...@gmail.com> wrote:
> Hi, all,
>
> Does R have a "const object" concept like which is in C++ language? I want to
> set some data frames as constant to avoid being modified unintentionally.
> Thanks!
>
>
LockBinding will prevent a variable from being modified (but you could
still rm it and then subsequently create a variable of the same name).
> xx <- 33
> lockBinding("xx", .GlobalEnv)
> xx <- 44
Error: cannot change value of locked binding for 'xx'
> rm(xx) # can still do this
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