不多说了，直接贴代码。就一个hpp文件。

 1 #include <functional>
 2 
 3 #define CONCAT_(a, b) a##b
 4 #define CONCAT(a, b) CONCAT_(a,b)
 5 /*
 6 eg. defer(代码);  注意后面 一定要加上 ;
 7 */
 8 
 9 #define defer(code) DeferOp CONCAT(_defer_, __LINE__) = [&](){code}
10 
11 class DeferOp
12 { 13 public: 14 DeferOp(std::function<void()>&& fn) 15  : m_fun(std::move(fn)) 16  {} 17 ~DeferOp() 18  { 19 if (nullptr != m_fun) 20  { 21  m_fun(); 22  } 23  } 24 25 #if _MSC_VER >= 1700 //VS2012 26 DeferOp(DeferOp &&other) = delete; 27 DeferOp(const DeferOp&) = delete; 28 void operator=(const DeferOp &) = delete; 29 #else 30 DeferOp(DeferOp &&other); 31 DeferOp(const DeferOp&); 32 void operator=(const DeferOp &); 33 #endif 34 protected: 35 std::function<void()> m_fun; 36 };

使用方法：

1 {
2  defer 3  ( 4  //代码 5  ); 6 } 

再加个 vs 代码片段

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <CodeSnippets xmlns="http://schemas.microsoft.com/VisualStudio/2005/CodeSnippet">
 3     <CodeSnippet Format="1.0.0">
 4         <Header>
 5             <Title>defer</Title>
 6             <Shortcut>defer</Shortcut>
 7             <Description>延迟的代码片段</Description>
 8             <Author>bin432</Author>
 9             <SnippetTypes>
10                 <SnippetType>Expansion</SnippetType>
11                 <SnippetType>SurroundsWith</SnippetType>
12             </SnippetTypes>
13         </Header>
14         <Snippet>
15             <Declarations>
16                 <Literal>
17                     
18                 </Literal>
19             </Declarations>
20             <Code Language="cpp"><![CDATA[defer
21  ( 22  $selected$ $end$ 23 );]]> 24 </Code> 25 </Snippet> 26 </CodeSnippet> 27 </CodeSnippets>

保存为defer.snippet文件，放到C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\Common7\IDE\VC\Snippets\2052\Visual C++目录。

这个目录可以在vs的 工具-代码片段管理器 就可以找到。

完毕！！！