R: Capture the call associated with a promise.

uneval {pryr} | R Documentation

## Capture the call associated with a promise.

### Description

This is an alternative to subsitute that performs one job, and so gives a stronger signal regarding the intention of your code. It returns an error if the name is not associated with a promise.

### Usage

    uneval(x)

### Arguments

`x` | unquoted variable name that refers to a promise. An error will be thrown if it's not a promise.

### See Also

Other promise tools: `is_promise`

### Examples

    f <- function(x) {
       uneval(x)
    }
    f(a + b)
    f(1 + 4)

    delayedAssign("x", 1 + 4)
    uneval(x)
    x
    uneval(x)

[Package pryr version 0.1.4 Index]