知行编程网知行编程网  2022-06-11 05:00 知行编程网 隐藏边栏 |   抢沙发  3 
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给代码写注释时有哪些讲究?
整理/来源:strongerHuang
转载:codesheep

如果领导给你一个项目的源码让你阅读,并理解重构代码,但里面一句注释都没有,我想这肯定是之前同事“删库跑路”了。


看一份源码什么很重要?除了各种代码规范之外,还有一个比较重要的就是注释

注释虽然写起来很痛苦, 但对保证代码可读性至关重要,下面我们就以C/C++代码规范注释为例,将描述如何注释以及有哪些讲究。


1

注释风格
1. 总述

一般使用 // 或 /* */,只要统一就好。


2. 说明

// 或 /* */ 都可以,但团队要在如何注释及注释风格上确保统一。



2

文件注释
1. 总述
在每一个文件开头加入版权、作者、时间等描述。

文件注释描述了该文件的内容,如果一个文件只声明,或实现,或测试了一个对象,并且这个对象已经在它的声明处进行了详细的注释,那么就没必要再加上文件注释,除此之外的其他文件都需要文件注释。

2. 说明

法律公告和作者信息:
每个文件都应该包含许可证引用。也要为项目选择合适的许可证版本(比如, Apache 2.0, BSD, LGPL, GPL)。

3. 文件内容

如果一个 .h 文件声明了多个概念, 则文件注释应当对文件的内容做一个大致的说明, 同时说明各概念之间的联系。一个一到两行的文件注释就足够了, 对于每个概念的详细文档应当放在各个概念中, 而不是文件注释中。

不要在 .h 和 .cc 之间复制注释, 这样的注释偏离了注释的实际意义。

最后再举个最简单的实际例子:



3

函数注释
1. 总述
函数声明处的注释描述函数功能; 定义处的注释描述函数实现。

2. 说明

函数声明:
基本上每个函数声明处前都应当加上注释, 描述函数的功能和用途。只有在函数的功能简单而明显时才能省略这些注释(例如, 简单的取值和设值函数)。

比如:

函数定义:
如果函数的实现过程中用到了很巧妙的方式, 那么在函数定义处应当加上解释性的注释。比如, 你所使用的编程技巧, 实现的大致步骤, 或解释如此实现的理由。举个例子, 你可以说明为什么函数的前半部分要加锁而后半部分不需要。

不要 从 .h 文件或其他地方的函数声明处直接复制注释. 简要重述函数功能是可以的, 但注释重点要放在如何实现上。


4

变量注释
1. 总述
通常变量名本身足以很好说明变量用途, 某些情况下, 也需要额外的注释说明。


2. 说明

根据不同场景、不同修饰符,变量可以分为很多种类,总的来说变量分为全局变量、局部变量。

一般来说局部变量仅限于局部范围,其含义相对简单容易理解,只需要简单注释即可。

全局变量一般作用于多个文件,或者整个工程,因此,其含义相对更复杂,所以在注释的时候,最好描述清楚其具体含义,就是尽量全面描述。

(提示:全局变量尽量少用)


5

拼写注释

1. 总述

可能一个变量、一个函数包含的意思非常复杂,需要多个单词拼写而成,此时对拼写内容就需要详细注释。


2. 说明

注释的通常写法是包含正确大小写和结尾句号的完整叙述性语句。大多数情况下, 完整的句子比句子片段可读性更高。短一点的注释, 比如代码行尾注释, 可以随意点, 但依然要注意风格的一致性。

同时,注释中的拼写、逗号也很重要。虽然被别人指出该用分号时却用了逗号多少有些尴尬, 但清晰易读的代码还是很重要的。正确的标点, 拼写和语法对此会有很大帮助


6

TODO 注释

1. 总述

对那些临时的, 短期的解决方案, 或已经够好但仍不完美的代码使用 TODO 注释。
TODO 注释要使用全大写的字符串 TODO, 在随后的圆括号里写上你的名字, 邮件地址, bug ID, 或其它身份标识和与这一 TODO 相关的 issue。主要目的是让添加注释的人 (也是可以请求提供更多细节的人) 可根据规范的 TODO 格式进行查找。添加 TODO 注释并不一定意味着你要自己来修正, 因此当你加上带有姓名的 TODO 时, 一般都是写上自己的名字。


7

结 语

注释固然很重要, 但最好的代码应当本身就是文档,有意义的类型名和变量名, 要远胜过要用注释解释的含糊不清的名字。


你写的注释是给代码阅读者看的, 也就是下一个需要理解你代码的人. 所以慷慨些吧, 下一个读者可能就是你!



给代码写注释时有哪些讲究?




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给代码写注释时有哪些讲究?


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data-darkmode-original-bgcolor-15900529136199="rgb(255, 255, 255)" data-darkmode-color-15900529136199="rgb(230, 230, 230)" data-darkmode-original-color-15900529136199="rgb(0, 0, 0)" data-darkmode-bgimage-15900529136199="1" style="display: flex;justify-content: center;align-items: center;"><section data-darkmode-bgcolor-15860613985508="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15860613985508="rgb(255, 255, 255)" data-darkmode-color-15860613985508="rgb(230, 230, 230)" data-darkmode-original-color-15860613985508="rgb(0, 0, 0)" data-darkmode-bgimage-15860613985508="1" data-darkmode-bgcolor-15870356070738="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15870356070738="rgb(255, 255, 255)" data-darkmode-color-15870356070738="rgb(230, 230, 230)" data-darkmode-original-color-15870356070738="rgb(0, 0, 0)" data-darkmode-bgimage-15870356070738="1" data-darkmode-bgcolor-15870356071023="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15870356071023="rgb(255, 255, 255)" data-darkmode-color-15870356071023="rgb(230, 230, 230)" data-darkmode-original-color-15870356071023="rgb(0, 0, 0)" data-darkmode-bgimage-15870356071023="1" data-darkmode-bgcolor-15882384789136="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15882384789136="rgb(255, 255, 255)" data-darkmode-color-15882384789136="rgb(230, 230, 230)" data-darkmode-original-color-15882384789136="rgb(0, 0, 0)" data-darkmode-bgimage-15882384789136="1" data-darkmode-bgcolor-15882396318564="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15882396318564="rgb(255, 255, 255)" data-darkmode-color-15882396318564="rgb(230, 230, 230)" data-darkmode-original-color-15882396318564="rgb(0, 0, 0)" data-darkmode-bgimage-15882396318564="1" data-darkmode-bgcolor-15900529136199="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15900529136199="rgb(255, 255, 255)" data-darkmode-color-15900529136199="rgb(230, 230, 230)" data-darkmode-original-color-15900529136199="rgb(0, 0, 0)" data-darkmode-bgimage-15900529136199="1" style="margin-left: 2px;width: 20px;"></section><section data-brushtype="text" data-darkmode-bgcolor-15860613985508="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15860613985508="rgb(255, 255, 255)" data-darkmode-color-15860613985508="rgb(51, 51, 51)" data-darkmode-original-color-15860613985508="rgb(51, 51, 51)" data-darkmode-bgimage-15860613985508="1" data-darkmode-bgcolor-15870356070738="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15870356070738="rgb(255, 255, 255)" data-darkmode-color-15870356070738="rgb(51, 51, 51)" data-darkmode-original-color-15870356070738="rgb(51, 51, 51)" data-darkmode-bgimage-15870356070738="1" data-darkmode-bgcolor-15870356071023="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15870356071023="rgb(255, 255, 255)" data-darkmode-color-15870356071023="rgb(51, 51, 51)" data-darkmode-original-color-15870356071023="rgb(51, 51, 51)" data-darkmode-bgimage-15870356071023="1" data-darkmode-bgcolor-15882384789136="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15882384789136="rgb(255, 255, 255)" data-darkmode-color-15882384789136="rgb(51, 51, 51)" data-darkmode-original-color-15882384789136="rgb(51, 51, 51)" data-darkmode-bgimage-15882384789136="1" data-darkmode-bgcolor-15882396318564="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15882396318564="rgb(255, 255, 255)" data-darkmode-color-15882396318564="rgb(51, 51, 51)" data-darkmode-original-color-15882396318564="rgb(51, 51, 51)" data-darkmode-bgimage-15882396318564="1" data-darkmode-bgcolor-15900529136199="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15900529136199="rgb(255, 255, 255)" data-darkmode-color-15900529136199="rgb(51, 51, 51)" data-darkmode-original-color-15900529136199="rgb(51, 51, 51)" data-darkmode-bgimage-15900529136199="1" style="font-size: 14px;color: rgb(51, 51, 51);text-align: left;"><span style="font-family: 楷体, 楷体_GB2312, SimKai;">点这里,获取一大波福利</span></section></section></section></section></section></section></section>

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