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 };

1 {

2   defer

3     (

4       //代码

5     );

6 }    

 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>