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<meta name="description" content="值传递 # 函数传参有三种方式，分别是值传递（pass by value)、引用传递（pass by reference)，以及指针传递（pass by pointer)。指针传递也称为地址传递，本质上也属于值传递，它只不过传递的值是地址而已。所以按照广义的函数传递来分，分为值传递和引用传递。Go语言中函数传参值传递，不支持引用传递。但是由于切片，通道，映射等具有引用传递的某些特性，往往令人疑惑其应该是引用传递。这个章节我们就来探究下Go语言中函数传递的问题。
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在探究Go语言中函数传递的问题，我们先研究C++语言下的引用传递和指针传递是怎么回事。
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C++中指针传递 # #include <stdio.h> void swap(int* a,int *b){ printf("交换中：变量a值：%d， 地址：%p； 变量b值：%d，地址：%p\n", *a, &a, *b, &b); int temp = *a; *a = *b; *b = temp; } int main() { int a = 1; int b = 2; printf("交换前：变量a值：%d， 地址：%p； 变量b值：%d，地址：%p\n", a, &a, b, &b); swap(&a,&b); printf("交换后：变量a值：%d， 地址：%p； 变量b值：%d，地址：%p\n", a, &a, b, &b); return 0; } C++中引用传递 # #include <stdio.h> void swap(int &a, int &b){ printf("交换中：变量a值：%d， 地址：%p； 变量b值：%d，地址：%p\n", a, &a, b, &b); int temp = a; a = b; b = temp; } int main() { int a = 1; int b = 2; printf("交换前：变量a值：%d， 地址：%p； 变量b值：%d，地址：%p\n", a, &a, b, &b); swap(a,b); printf("交换后：变量a值：%d， 地址：%p； 变量b值：%d，地址：%p\n", a, &a, b, &b); return 0; } 进一步阅读 # When are function parameters passed by value?">
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<meta name="color-scheme" content="light dark"><meta property="og:title" content="值传递" />
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<meta property="og:description" content="值传递 # 函数传参有三种方式，分别是值传递（pass by value)、引用传递（pass by reference)，以及指针传递（pass by pointer)。指针传递也称为地址传递，本质上也属于值传递，它只不过传递的值是地址而已。所以按照广义的函数传递来分，分为值传递和引用传递。Go语言中函数传参值传递，不支持引用传递。但是由于切片，通道，映射等具有引用传递的某些特性，往往令人疑惑其应该是引用传递。这个章节我们就来探究下Go语言中函数传递的问题。
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在探究Go语言中函数传递的问题，我们先研究C++语言下的引用传递和指针传递是怎么回事。
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C++中指针传递 # #include <stdio.h> void swap(int* a,int *b){ printf("交换中：变量a值：%d， 地址：%p； 变量b值：%d，地址：%p\n", *a, &a, *b, &b); int temp = *a; *a = *b; *b = temp; } int main() { int a = 1; int b = 2; printf("交换前：变量a值：%d， 地址：%p； 变量b值：%d，地址：%p\n", a, &a, b, &b); swap(&a,&b); printf("交换后：变量a值：%d， 地址：%p； 变量b值：%d，地址：%p\n", a, &a, b, &b); return 0; } C++中引用传递 # #include <stdio.h> void swap(int &a, int &b){ printf("交换中：变量a值：%d， 地址：%p； 变量b值：%d，地址：%p\n", a, &a, b, &b); int temp = a; a = b; b = temp; } int main() { int a = 1; int b = 2; printf("交换前：变量a值：%d， 地址：%p； 变量b值：%d，地址：%p\n", a, &a, b, &b); swap(a,b); printf("交换后：变量a值：%d， 地址：%p； 变量b值：%d，地址：%p\n", a, &a, b, &b); return 0; } 进一步阅读 # When are function parameters passed by value?" />
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<article class="markdown"><h1 id="值传递">
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值传递
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<a class="anchor" href="#%e5%80%bc%e4%bc%a0%e9%80%92">#</a>
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</h1>
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<p>函数传参有三种方式，分别是值传递（pass by value)、引用传递（pass by reference)，以及指针传递（pass by pointer)。指针传递也称为地址传递，本质上也属于值传递，它只不过传递的值是地址而已。所以按照广义的函数传递来分，分为值传递和引用传递。Go语言中函数传参值传递，不支持引用传递。但是由于切片，通道，映射等具有引用传递的某些特性，往往令人疑惑其应该是引用传递。这个章节我们就来探究下Go语言中函数传递的问题。</p>
|
|
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<p>在探究Go语言中函数传递的问题，我们先研究C++语言下的引用传递和指针传递是怎么回事。</p>
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<h2 id="c中指针传递">
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C++中指针传递
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<a class="anchor" href="#c%e4%b8%ad%e6%8c%87%e9%92%88%e4%bc%a0%e9%80%92">#</a>
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</h2>
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<div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-cpp" data-lang="cpp"><span style="display:flex;"><span><span style="color:#75715e">#include</span> <span style="color:#75715e"><stdio.h></span><span style="color:#75715e">
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</span></span></span><span style="display:flex;"><span><span style="color:#75715e"></span>
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</span></span><span style="display:flex;"><span><span style="color:#66d9ef">void</span> <span style="color:#a6e22e">swap</span>(<span style="color:#66d9ef">int</span><span style="color:#f92672">*</span> a,<span style="color:#66d9ef">int</span> <span style="color:#f92672">*</span>b){
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</span></span><span style="display:flex;"><span> printf(<span style="color:#e6db74">"交换中：变量a值：%d， 地址：%p； 变量b值：%d，地址：%p</span><span style="color:#ae81ff">\n</span><span style="color:#e6db74">"</span>, <span style="color:#f92672">*</span>a, <span style="color:#f92672">&</span>a, <span style="color:#f92672">*</span>b, <span style="color:#f92672">&</span>b);
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</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">int</span> temp <span style="color:#f92672">=</span> <span style="color:#f92672">*</span>a;
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</span></span><span style="display:flex;"><span> <span style="color:#f92672">*</span>a <span style="color:#f92672">=</span> <span style="color:#f92672">*</span>b;
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</span></span><span style="display:flex;"><span> <span style="color:#f92672">*</span>b <span style="color:#f92672">=</span> temp;
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</span></span><span style="display:flex;"><span>}
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</span></span><span style="display:flex;"><span>
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</span></span><span style="display:flex;"><span><span style="color:#66d9ef">int</span> <span style="color:#a6e22e">main</span>() {
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</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">int</span> a <span style="color:#f92672">=</span> <span style="color:#ae81ff">1</span>;
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</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">int</span> b <span style="color:#f92672">=</span> <span style="color:#ae81ff">2</span>;
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</span></span><span style="display:flex;"><span> printf(<span style="color:#e6db74">"交换前：变量a值：%d， 地址：%p； 变量b值：%d，地址：%p</span><span style="color:#ae81ff">\n</span><span style="color:#e6db74">"</span>, a, <span style="color:#f92672">&</span>a, b, <span style="color:#f92672">&</span>b);
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</span></span><span style="display:flex;"><span> swap(<span style="color:#f92672">&</span>a,<span style="color:#f92672">&</span>b);
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</span></span><span style="display:flex;"><span> printf(<span style="color:#e6db74">"交换后：变量a值：%d， 地址：%p； 变量b值：%d，地址：%p</span><span style="color:#ae81ff">\n</span><span style="color:#e6db74">"</span>, a, <span style="color:#f92672">&</span>a, b, <span style="color:#f92672">&</span>b);
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</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">return</span> <span style="color:#ae81ff">0</span>;
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</span></span><span style="display:flex;"><span>}
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</span></span></code></pre></div><h2 id="c中引用传递">
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C++中引用传递
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<a class="anchor" href="#c%e4%b8%ad%e5%bc%95%e7%94%a8%e4%bc%a0%e9%80%92">#</a>
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</h2>
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<div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-cpp" data-lang="cpp"><span style="display:flex;"><span><span style="color:#75715e">#include</span> <span style="color:#75715e"><stdio.h></span><span style="color:#75715e">
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</span></span></span><span style="display:flex;"><span><span style="color:#75715e"></span><span style="color:#66d9ef">void</span> <span style="color:#a6e22e">swap</span>(<span style="color:#66d9ef">int</span> <span style="color:#f92672">&</span>a, <span style="color:#66d9ef">int</span> <span style="color:#f92672">&</span>b){
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</span></span><span style="display:flex;"><span> printf(<span style="color:#e6db74">"交换中：变量a值：%d， 地址：%p； 变量b值：%d，地址：%p</span><span style="color:#ae81ff">\n</span><span style="color:#e6db74">"</span>, a, <span style="color:#f92672">&</span>a, b, <span style="color:#f92672">&</span>b);
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</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">int</span> temp <span style="color:#f92672">=</span> a;
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</span></span><span style="display:flex;"><span> a <span style="color:#f92672">=</span> b;
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</span></span><span style="display:flex;"><span> b <span style="color:#f92672">=</span> temp;
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</span></span><span style="display:flex;"><span>}
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</span></span><span style="display:flex;"><span>
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</span></span><span style="display:flex;"><span><span style="color:#66d9ef">int</span> <span style="color:#a6e22e">main</span>() {
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</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">int</span> a <span style="color:#f92672">=</span> <span style="color:#ae81ff">1</span>;
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</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">int</span> b <span style="color:#f92672">=</span> <span style="color:#ae81ff">2</span>;
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</span></span><span style="display:flex;"><span> printf(<span style="color:#e6db74">"交换前：变量a值：%d， 地址：%p； 变量b值：%d，地址：%p</span><span style="color:#ae81ff">\n</span><span style="color:#e6db74">"</span>, a, <span style="color:#f92672">&</span>a, b, <span style="color:#f92672">&</span>b);
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</span></span><span style="display:flex;"><span> swap(a,b);
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</span></span><span style="display:flex;"><span> printf(<span style="color:#e6db74">"交换后：变量a值：%d， 地址：%p； 变量b值：%d，地址：%p</span><span style="color:#ae81ff">\n</span><span style="color:#e6db74">"</span>, a, <span style="color:#f92672">&</span>a, b, <span style="color:#f92672">&</span>b);
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</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">return</span> <span style="color:#ae81ff">0</span>;
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</span></span><span style="display:flex;"><span>}
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</span></span></code></pre></div><h2 id="进一步阅读">
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进一步阅读
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<a class="anchor" href="#%e8%bf%9b%e4%b8%80%e6%ad%a5%e9%98%85%e8%af%bb">#</a>
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</h2>
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<ul>
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<li>
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<a href="https://golang.org/doc/faq#pass_by_value">When are function parameters passed by value?</a></li>
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</ul>
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