[Rd] capture "->"

[Adrian Dușa]

That would have been an elegant solution, but it doesn't seem to work:

> `->` <- `+`
> 1 -> 3 # expecting 4
Error in 3 <- 1 : invalid (do_set) left-hand side to assignment

It is possible to reassign other multiple character operators:
> `%%` <- `+`
> 1 %% 3
[1] 4

The assignment operator `->` is so special for the R parser, that it seems
impossible to change.

On Fri, Mar 1, 2024 at 11:30 PM <avi.e.gross using gmail.com> wrote:

> Adrian,
>
> That is indeed a specialized need albeit not necessarily one that cannot
> be done by requiring an alternate way of typing a formula that avoids being
> something the parser sees as needed to do at that level.
>
> In this case, my other questions become moot as I assume the global
> assignment operator and somethings like assign(“xyz”, 5) will not be in the
> way.
>
> What I was wondering about is what happens if you temporarily disable the
> meaning of the assignment operator <- and turn it back on after.
>
> In the following code, for no reason, I redefine + to mean – and then undo
> it:
>
>
> > temp <- `+`
> > `+` <- `-`
> > 5 + 3
> [1] 2
> > `+` <- temp
> > 5 + 3
> [1] 8
>

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