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# Evaluate an expression while preserving column labels

Source: `R/utils-labels.R`
`with_labels.Rd`

Snapshots labels from `df` before evaluating `expr`, then reapplies them to matching columns in the result. New columns created inside `expr` receive no label automatically.

## Usage

    with_labels(df, expr)

## Arguments

df

  A data frame carrying `"label"` attributes.

expr

  An unquoted expression that transforms `df` and returns a data frame.

## Value

The data frame produced by `expr`, with original labels restored.