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Edit File: is_copyable.html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><title>R: Is an object copyable?</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <link rel="stylesheet" type="text/css" href="R.css" /> </head><body> <table width="100%" summary="page for is_copyable {rlang}"><tr><td>is_copyable {rlang}</td><td style="text-align: right;">R Documentation</td></tr></table> <h2>Is an object copyable?</h2> <h3>Description</h3> <p>When an object is modified, R generally copies it (sometimes lazily) to enforce <a href="https://en.wikipedia.org/wiki/Value_semantics">value semantics</a>. However, some internal types are uncopyable. If you try to copy them, either with <code style="white-space: pre;"><-</code> or by argument passing, you actually create references to the original object rather than actual copies. Modifying these references can thus have far reaching side effects. </p> <h3>Usage</h3> <pre> is_copyable(x) </pre> <h3>Arguments</h3> <table summary="R argblock"> <tr valign="top"><td><code>x</code></td> <td> <p>An object to test.</p> </td></tr> </table> <h3>Examples</h3> <pre> # Let's add attributes with structure() to uncopyable types. Since # they are not copied, the attributes are changed in place: env <- env() structure(env, foo = "bar") env # These objects that can only be changed with side effect are not # copyable: is_copyable(env) structure(base::list, foo = "bar") str(base::list) </pre> <hr /><div style="text-align: center;">[Package <em>rlang</em> version 1.0.6 <a href="00Index.html">Index</a>]</div> </body></html>