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<h1 class="title">Choosing your Guarantees</h1>
<p><small>There is a new edition of the book and this is an old link.</small></p>
<blockquote>
<p>Smart pointers are data structures that act like a pointer, but they also have additional metadata and capabilities.
The different smart pointers defined in Rust’s standard library provide extra functionality beyond what references provide.</p>
</blockquote>
<pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="ident">b</span> <span class="op">=</span> <span class="ident">Box</span>::<span class="ident">new</span>(<span class="number">5</span>);
<span class="macro">println</span><span class="macro">!</span>(<span class="string">"b = {}"</span>, <span class="ident">b</span>);<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Alet%20b%20%3D%20Box%3A%3Anew(5)%3B%0Aprintln!(%22b%20%3D%20%7B%7D%22%2C%20b)%3B%0A%7D">Run</a></pre>
<hr />
<p>Here are the relevant sections in the new and old books:</p>
<ul>
<li><strong><a href="second-edition/ch15-00-smart-pointers.html">In the second edition: Ch 15.00 — Smart Pointers</a></strong></li>
<li><small><a href="first-edition/choosing-your-guarantees.html">In the first edition: Ch 4.8 — Choosing your Guarantees</a></small></li>
</ul>
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