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        rust踩坑笔记 - 赵小黑的博客
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<li><a href="#基本类型-primitives">基本类型-Primitives</a>
<ul>
<li><a href="#标准类型-scalar-types">标准类型 Scalar Types</a>
<ul>
<li><a href="#三级目录">三级目录</a>
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<li><a href="#四级目录">四级目录</a></li>
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<li><a href="#复合类型-compound-types">复合类型 Compound Types</a></li>
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      <h1 id="基本类型-primitives">基本类型-Primitives</h1>

<h2 id="标准类型-scalar-types">标准类型 Scalar Types</h2>

<ol>
<li><p>有符号整型 signed integers: <code>i8</code>, <code>i16</code>, <code>i32</code>, <code>i64</code>, <code>i128</code> and <code>isize</code> (pointer size)</p></li>

<li><p>无符号整型 unsigned integers: <code>u8</code>, <code>u16</code>, <code>u32</code>, <code>u64</code>, <code>u128</code> and <code>usize</code> (pointer size)</p></li>

<li><p>浮点型 floating point: <code>f32</code>, <code>f64</code></p></li>

<li><p>字符 <code>char</code> Unicode scalar values like <code>'a'</code>, <code>'α'</code> and <code>'∞'</code> (4 bytes each)</p></li>

<li><p>布尔 <code>bool</code> either <code>true</code> or <code>false</code></p></li>

<li><p>the unit type <code>()</code>, whose only possible value is an empty tuple: <code>()</code></p></li>
</ol>

<blockquote>
<p>我的理解就是个empty吧</p>
</blockquote>

<p>数值字面,没有后缀时.默认整数为 <code>i32</code>,浮点数  <code>f64</code></p>

<h3 id="三级目录">三级目录</h3>

<ol>
<li><p>有符号整型 signed integers: <code>i8</code>, <code>i16</code>, <code>i32</code>, <code>i64</code>, <code>i128</code> and <code>isize</code> (pointer size)</p></li>

<li><p>无符号整型 unsigned integers: <code>u8</code>, <code>u16</code>, <code>u32</code>, <code>u64</code>, <code>u128</code> and <code>usize</code> (pointer size)</p></li>

<li><p>浮点型 floating point: <code>f32</code>, <code>f64</code></p></li>

<li><p>字符 <code>char</code> Unicode scalar values like <code>'a'</code>, <code>'α'</code> and <code>'∞'</code> (4 bytes each)</p></li>

<li><p>布尔 <code>bool</code> either <code>true</code> or <code>false</code></p></li>

<li><p>the unit type <code>()</code>, whose only possible value is an empty tuple: <code>()</code></p></li>
</ol>

<blockquote>
<p>我的理解就是个empty吧</p>
</blockquote>

<p>数值字面,没有后缀时.默认整数为 <code>i32</code>,浮点数  <code>f64</code></p>

<h4 id="四级目录">四级目录</h4>

<ol>
<li><p>有符号整型 signed integers: <code>i8</code>, <code>i16</code>, <code>i32</code>, <code>i64</code>, <code>i128</code> and <code>isize</code> (pointer size)</p></li>

<li><p>无符号整型 unsigned integers: <code>u8</code>, <code>u16</code>, <code>u32</code>, <code>u64</code>, <code>u128</code> and <code>usize</code> (pointer size)</p></li>

<li><p>浮点型 floating point: <code>f32</code>, <code>f64</code></p></li>

<li><p>字符 <code>char</code> Unicode scalar values like <code>'a'</code>, <code>'α'</code> and <code>'∞'</code> (4 bytes each)</p></li>

<li><p>布尔 <code>bool</code> either <code>true</code> or <code>false</code></p></li>

<li><p>the unit type <code>()</code>, whose only possible value is an empty tuple: <code>()</code></p></li>
</ol>

<blockquote>
<p>我的理解就是个empty吧</p>
</blockquote>

<p>数值字面,没有后缀时.默认整数为 <code>i32</code>,浮点数  <code>f64</code></p>

<h2 id="复合类型-compound-types">复合类型 Compound Types</h2>

<ol>
<li>数组 array [1,2,3]</li>
<li>元组 tuple (1,true,&ldquo;str&rdquo;,&lsquo;a&rsquo;&hellip;)</li>
</ol>

<p>Note: 默认变量赋值后是不可变的,需要重复赋值需要用<code>mut</code> 修饰</p>

<pre><code class="language-rust">let immutable = 1;
immutable = 2; // ERROR

let mut immutable = 1;
immutable = 2; // SUCCESS
</code></pre>

<h1 id="所有权踩坑">所有权踩坑</h1>

<ol>
<li><p>可变引用在作用域下<strong>有且只能有一个可变引用</strong></p></li>

<li><p>不可在<strong>拥有不可变引用</strong>的同时<strong>拥有可变引用</strong>,除非作用域没有重叠.即在引用可变引用时,不可变引用已经失效了.</p>

<pre><code class="language-rust">let mut s = String::from(&quot;hello&quot;);
   
let r1 = &amp;s; // 没问题
let r2 = &amp;s; // 没问题
let r3 = &amp;mut s; // 大问题
   
println!(&quot;{}, {}, and {}&quot;, r1, r2, r3);
   
//////////////////////////////////////
let mut s = String::from(&quot;hello&quot;);
   
let r1 = &amp;s; // 没问题
let r2 = &amp;s; // 没问题
println!(&quot;{} and {}&quot;, r1, r2);
// 此位置之后 r1 和 r2 不再使用
   
let r3 = &amp;mut s; // 没问题
println!(&quot;{}&quot;, r3);
</code></pre></li>
</ol>
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