R: Capture ... (dots) for later lazy evaluation.

lazy_dots {lazyeval} | R Documentation

## Capture ... (dots) for later lazy evaluation.

### Description

Capture ... (dots) for later lazy evaluation.

### Usage

    lazy_dots(..., .follow_symbols = FALSE, .ignore_empty = FALSE)

### Arguments

`...` | Dots from another function
`.follow_symbols` | If `TRUE`, the default, follows promises across function calls. See `vignette("chained-promises")` for details.
`.ignore_empty` | If `TRUE`, empty arguments will be ignored.

### Value

A named list of `lazy` expressions.

### Examples

    lazy_dots(x = 1)
    lazy_dots(a, b, c * 4)

    f <- function(x = a + b, ...) {
      lazy_dots(x = x, y = a + b, ...)
    }
    f(z = a + b)
    f(z = a + b, .follow_symbols = TRUE)

    # .follow_symbols is off by default because it causes problems
    # with lazy loaded objects
    lazy_dots(letters)
    lazy_dots(letters, .follow_symbols = TRUE)

    # You can also modify a dots like a list. Anything on the RHS will
    # be coerced to a lazy.
    l <- lazy_dots(x = 1)
    l$y <- quote(f)
    l[c("y", "x")]
    l["z"] <- list(~g)

    c(lazy_dots(x = 1), lazy_dots(f))

[Package lazyeval version 0.2.1 Index]