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<main>
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<h1 id="use-and-pub"><a class="header" href="#use-and-pub">Use and pub</a></h1>
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<ol>
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<li>🌟 We can bring two types of the same name into the same scope with use, but you need <code>as</code> keyword.</li>
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</ol>
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<pre><pre class="playground"><code class="language-rust editable edition2021">use std::fmt::Result;
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use std::io::Result;
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fn main() {}</code></pre></pre>
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<ol start="2">
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<li>🌟🌟 If we are using multiple items defined in the same crate or module, then listing each item on its own line will take up too much vertical space.</li>
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</ol>
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<pre><pre class="playground"><code class="language-rust editable edition2021">
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// FILL in the blank in two ways
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// DON'T add new code line
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use std::collections::__;
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fn main() {
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let _c1:HashMap<&str, i32> = HashMap::new();
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let mut c2 = BTreeMap::new();
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c2.insert(1, "a");
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let _c3: HashSet<i32> = HashSet::new();
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}</code></pre></pre>
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<h3 id="re-exporting-names-with-pub-use"><a class="header" href="#re-exporting-names-with-pub-use">Re-exporting names with <code>pub use</code></a></h3>
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<ol start="3">
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<li>🌟🌟🌟 In our recently created package <code>hello-package</code>, add something to make the below code work</li>
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</ol>
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<pre><pre class="playground"><code class="language-rust editable edition2021">fn main() {
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assert_eq!(hello_package::hosting::seat_at_table(), "sit down please");
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assert_eq!(hello_package::eat_at_restaurant(),"yummy yummy!");
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}</code></pre></pre>
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<h3 id="pubin-crate"><a class="header" href="#pubin-crate">Pub(in Crate)</a></h3>
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<p>Sometimes we want an item only be public to a certain crate. For this we can use the <code>pub(in Crate)</code> syntax.</p>
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<h4 id="example"><a class="header" href="#example">Example</a></h4>
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<pre><pre class="playground"><code class="language-rust editable edition2021">pub mod a {
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pub const I: i32 = 3;
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fn semisecret(x: i32) -> i32 {
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use self::b::c::J;
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x + J
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}
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pub fn bar(z: i32) -> i32 {
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semisecret(I) * z
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}
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pub fn foo(y: i32) -> i32 {
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semisecret(I) + y
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}
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mod b {
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pub(in crate::a) mod c {
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pub(in crate::a) const J: i32 = 4;
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}
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}
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}</code></pre></pre>
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<h3 id="full-code"><a class="header" href="#full-code">Full Code</a></h3>
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<p>The full code of <code>hello-package</code> is <a href="https://github.com/sunface/rust-by-practice/tree/master/practices/hello-package">here</a>.</p>
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<blockquote>
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<p>You can find the solutions <a href="https://github.com/sunface/rust-by-practice/blob/master/solutions/crate-module/use-pub.md">here</a> (under the solutions path), but only use it when you need it :)</p>
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