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<main>
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<h1 id="rust-新版解读--176--abi-兼容性更新"><a class="header" href="#rust-新版解读--176--abi-兼容性更新">Rust 新版解读 | 1.76 | ABI 兼容性更新</a></h1>
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<blockquote>
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<p>Rust 1.76 官方 release doc: <a href="https://blog.rust-lang.org/2024/02/08/Rust-1.76.0.html">Announcing Rust 1.76.0 | Rust Blog</a></p>
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</blockquote>
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<p>通过 <a href="https://www.rust-lang.org/tools/install">rustup</a> 安装的同学可以使用以下命令升级到 1.76 版本:</p>
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<pre><code class="language-shell">$ rustup update stable
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</code></pre>
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<p>2024 新年好！</p>
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<h2 id="abi-兼容性更新"><a class="header" href="#abi-兼容性更新">ABI 兼容性更新</a></h2>
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<p>函数指针文档中新的 <a href="https://doc.rust-lang.org/stable/std/primitive.fn.html#abi-compatibility">ABI 兼容性部分</a>描述了函数签名与 ABI 兼容的含义，并包括一份当前 Rust 中参数和返回值类型符合 ABI 兼容的列表。在大多数情况下，本文档不会添加任何新的保证，仅描述现有的兼容性状态。</p>
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<p>当前保证了 <code>char</code> 和 <code>u32</code> 是 ABI 兼容的。它们始终具有相同的大小和对齐方式，也被认为是完全等效的。</p>
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<h2 id="通过引用获取类型名称描述"><a class="header" href="#通过引用获取类型名称描述">通过引用获取类型名称描述</a></h2>
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<p>出于调试目的，自 Rust 1.38 起，<code>any::type_name::<T>()</code> 可用于获取类型 <code>T</code> 的字符串描述，但这需要显式写明类型。而写清楚类型并不总是那么容易，特别是对于像闭包这样的不可命名类型或不透明的返回类型。新的 <code>any::type_name_of_val(&T)</code> 允许使用任何对象的引用，来获取对应类型的描述性名称。</p>
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<pre><pre class="playground"><code class="language-rust edition2021">fn get_iter() -> impl Iterator<Item = i32> {
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[1, 2, 3].into_iter()
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}
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fn main() {
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let iter = get_iter();
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let iter_name = std::any::type_name_of_val(&iter);
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let sum: i32 = iter.sum();
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println!("The sum of the `{iter_name}` is {sum}.");
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}</code></pre></pre>
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<p>上述代码将会打印出</p>
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<pre><code class="language-text">The sum of the `core::array::iter::IntoIter<i32, 3>` is 6.
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</code></pre>
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<h2 id="others"><a class="header" href="#others">Others</a></h2>
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<p>其它更新细节，和稳定的API列表，参考<a href="https://blog.rust-lang.org/2024/02/08/Rust-1.76.0.html#stabilized-apis">原Blog</a></p>
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