⭐ 欢迎来到虫虫下载站！ | 📦 资源下载 📁 资源专辑 ℹ️ 关于我们
⭐ 虫虫下载站
📤 上传资源

📄 item_058.htm

📁 C++程序编写规范,适合C++中级读者
💻 HTM
📖 第 1 页 / 共 2 页
字号:
🔍
12 
<html xmlns:v="urn:schemas-microsoft-com:vml"
xmlns:o="urn:schemas-microsoft-com:office:office"
xmlns:w="urn:schemas-microsoft-com:office:word"
xmlns="http://www.w3.org/TR/REC-html40">

<head>
<meta http-equiv=Content-Type content="text/html; charset=gb2312">
<meta name=ProgId content=Word.Document>
<meta name=Generator content="Microsoft Word 11">
<meta name=Originator content="Microsoft Word 11">
<link rel=File-List href="filelist-34.xml.css" tppabs="http://www.gesoftfactory.com/developer/cppcodingstandards/Item_058_files/filelist.xml">
<title>58</title>
<!--[if gte mso 9]><xml>
 <o:DocumentProperties>
  <o:Author>SGuy</o:Author>
  <o:LastAuthor>Dove</o:LastAuthor>
  <o:Revision>2</o:Revision>
  <o:TotalTime>128</o:TotalTime>
  <o:Created>2005-08-07T04:17:00Z</o:Created>
  <o:LastSaved>2005-08-07T04:17:00Z</o:LastSaved>
  <o:Pages>1</o:Pages>
  <o:Words>586</o:Words>
  <o:Characters>3344</o:Characters>
  <o:Lines>27</o:Lines>
  <o:Paragraphs>7</o:Paragraphs>
  <o:CharactersWithSpaces>3923</o:CharactersWithSpaces>
  <o:Version>11.5606</o:Version>
 </o:DocumentProperties>
</xml><![endif]--><!--[if gte mso 9]><xml>
 <w:WordDocument>
  <w:SpellingState>Clean</w:SpellingState>
  <w:GrammarState>Clean</w:GrammarState>
  <w:PunctuationKerning/>
  <w:ValidateAgainstSchemas/>
  <w:SaveIfXMLInvalid>false</w:SaveIfXMLInvalid>
  <w:IgnoreMixedContent>false</w:IgnoreMixedContent>
  <w:AlwaysShowPlaceholderText>false</w:AlwaysShowPlaceholderText>
  <w:Compatibility>
   <w:BreakWrappedTables/>
   <w:SnapToGridInCell/>
   <w:WrapTextWithPunct/>
   <w:UseAsianBreakRules/>
   <w:DontGrowAutofit/>
   <w:UseFELayout/>
  </w:Compatibility>
  <w:BrowserLevel>MicrosoftInternetExplorer4</w:BrowserLevel>
 </w:WordDocument>
</xml><![endif]--><!--[if gte mso 9]><xml>
 <w:LatentStyles DefLockedState="false" LatentStyleCount="156">
 </w:LatentStyles>
</xml><![endif]-->
<style>
<!--
 /* Font Definitions */
 @font-face
	{font-family:宋体;
	panose-1:2 1 6 0 3 1 1 1 1 1;
	mso-font-alt:SimSun;
	mso-font-charset:134;
	mso-generic-font-family:auto;
	mso-font-pitch:variable;
	mso-font-signature:3 135135232 16 0 262145 0;}
@font-face
	{font-family:"\@宋体";
	panose-1:2 1 6 0 3 1 1 1 1 1;
	mso-font-charset:134;
	mso-generic-font-family:auto;
	mso-font-pitch:variable;
	mso-font-signature:3 135135232 16 0 262145 0;}
 /* Style Definitions */
 p.MsoNormal, li.MsoNormal, div.MsoNormal
	{mso-style-parent:"";
	margin:0cm;
	margin-bottom:.0001pt;
	mso-pagination:widow-orphan;
	font-size:12.0pt;
	font-family:"Times New Roman";
	mso-fareast-font-family:宋体;}
h3
	{mso-style-next:Normal;
	margin-top:12.0pt;
	margin-right:0cm;
	margin-bottom:3.0pt;
	margin-left:0cm;
	mso-pagination:widow-orphan;
	page-break-after:avoid;
	mso-outline-level:3;
	font-size:13.0pt;
	font-family:Arial;}
span.SpellE
	{mso-style-name:"";
	mso-spl-e:yes;}
span.GramE
	{mso-style-name:"";
	mso-gram-e:yes;}
@page Section1
	{size:612.0pt 792.0pt;
	margin:72.0pt 90.0pt 72.0pt 90.0pt;
	mso-header-margin:35.4pt;
	mso-footer-margin:35.4pt;
	mso-paper-source:0;}
div.Section1
	{page:Section1;}
-->
</style>
<!--[if gte mso 10]>
<style>
 /* Style Definitions */
 table.MsoNormalTable
	{mso-style-name:"Table Normal";
	mso-tstyle-rowband-size:0;
	mso-tstyle-colband-size:0;
	mso-style-noshow:yes;
	mso-style-parent:"";
	mso-padding-alt:0cm 5.4pt 0cm 5.4pt;
	mso-para-margin:0cm;
	mso-para-margin-bottom:.0001pt;
	mso-pagination:widow-orphan;
	font-size:10.0pt;
	font-family:"Times New Roman";
	mso-ansi-language:#0400;
	mso-fareast-language:#0400;
	mso-bidi-language:#0400;}
</style>
<![endif]--><!--[if gte mso 9]><xml>
 <o:shapedefaults v:ext="edit" spidmax="2050"/>
</xml><![endif]--><!--[if gte mso 9]><xml>
 <o:shapelayout v:ext="edit">
  <o:idmap v:ext="edit" data="1"/>
 </o:shapelayout></xml><![endif]-->
</head>

<body lang=ZH-CN style='tab-interval:36.0pt'>

<div class=Section1>

<h3><span lang=EN-US>58. </span><span style='font-family:宋体;mso-ascii-font-family:
Arial;mso-hansi-font-family:Arial'>除非有意让类型和函数协作，否则把它们放在单独的名字空间中</span></h3>

<p class=MsoNormal><span lang=EN-US><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><b style='mso-bidi-font-weight:normal'><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>摘要</span><span lang=EN-US><o:p></o:p></span></b></p>

<p class=MsoNormal><span lang=EN-US><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>协助编译器防止在名字查找时发生意外：把类型隔离在不同的名字空间中可以避免不希望的</span><span
lang=EN-US>argument-dependent lookup</span><span style='font-family:宋体;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>（</span><span
lang=EN-US>ADL</span><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>，也称为</span><span class=SpellE><span
lang=EN-US>Koeing</span></span><span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>查找），把类型放在相同的名字空间中（以及与它们直接相关的非成员函数；参见第</span><span
lang=EN-US>57</span><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>条）可以促成希望的</span><span lang=EN-US>ADL</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>。要避免把类型放到与模板函数（</span><span class=SpellE><span lang=EN-US>templated</span></span><span
lang=EN-US> function</span><span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>）或操作符相同的名字空间中。</span></p>

<p class=MsoNormal><span lang=EN-US><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><b style='mso-bidi-font-weight:normal'><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>讨论</span><span lang=EN-US><o:p></o:p></span></b></p>

<p class=MsoNormal><span lang=EN-US><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>只要遵循本条建议，就可以避免在代码中追踪难查的错误，还可以避免去了解许多隐晦的语言细节，这些细节你可能根本就不必了解。</span></p>

<p class=MsoNormal><span lang=EN-US><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>考虑下面这个实际的例子，它被公开贴在一个新闻组中：</span></p>

<p class=MsoNormal><span lang=EN-US><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal style='margin-left:36.0pt'><span lang=EN-US>#include
&lt;vector&gt;</span></p>

<p class=MsoNormal style='margin-left:36.0pt'><span lang=EN-US><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal style='margin-left:36.0pt'><span class=GramE><span
lang=EN-US>namespace</span></span><span lang=EN-US> N {</span></p>

<p class=MsoNormal style='margin-left:36.0pt'><span lang=EN-US><span
style='mso-spacerun:yes'>&nbsp; </span><span
style='mso-spacerun:yes'>&nbsp;&nbsp;</span><span class=SpellE><span
12

⌨️ 快捷键说明

复制代码 Ctrl + C
搜索代码 Ctrl + F
全屏模式 F11
切换主题 Ctrl + Shift + D
显示快捷键 ?
增大字号 Ctrl + =
减小字号 Ctrl + -