1使用#define包含（可以参考博客《你所不知道的事儿–#ifndef #endif不能防止编译器将文件包含两次》）
格式如下：
<code class="hljs r has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background: transparent;"><PROJECT>_<PATH>_<FILE>_例如，项目foo中的头文件foo/src/bar/baz.h，可以这样保护：<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">#ifndef FOO_BAR_BAZ_H_</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">#define FOO_BAR_BAZ_H_</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">...</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">#endif</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li></ul>
2#inlucde路径：
避免使用UNIX的.或..
3.使用静态成员函数或名字空间内的非成员函数，尽量不要使用裸的全局函数。
4.接口类以Interface为后缀。（有纯虚函数才能构建接口）
5.除特殊环境外，不要重载运算符。（哈哈，特殊环境就是指的面试吧！！）
6.在类中使用特定的声明顺序：
public在private之前；
成员函数在数据成员之前；
7.按引用传递的参数必须加上const
8.以下几点是对c++一些特性的禁止使用
不允许使用缺省函数参数；
禁止使用RTTI；
不使用C++异常
9.要使用C++的类型转换，如static_cast
不使用如下：
<code class="hljs cs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> y = (<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span>)x;<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> y = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span>(x);</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li></ul>
10.对于迭代器和其他模板对象使用前缀形式的自增、自减运算符。
理由是：前置自增 (++i) 通常要比后置自增 (i++) 效率更高。为什么前缀效率高呢？理由是：后置++会生成临时对象。
11.强烈建议在任何可能的情况下使用const。effective c++中说《 宁以const引用传递代替按值传递（内置类型除外）》
12.尽可能使用sizeof(varname)代替sizeof(type)。而关于sizeof的详细用法，博客《浅析C++中sizeof操作符的用法》有了介绍。
下面我觉得才是重中之重，命名约定：
13.少用缩写：
<code class="hljs cs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> price_count_reader;<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> num_errors;<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> num_dns_connections;</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li></ul>
14.文件命名全部小写：
<code class="hljs ruby has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background: transparent;">my_useful_class.ccmy-useful-<span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span>.<span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">cc</span></span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li></ul>
遵循谷歌编程规范的，都用.cc结尾，而不是我们之前用的.cpp。
15.（类、结构体、类型定义、枚举）的每个单词首字母均大写，而且不包含下划线：
<code class="hljs ruby has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">UrlTable</span></span>{};</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li></ul>16.变量名一律小写，单词之间用下划线；而且类的成员变量以下划线结尾。
<code class="hljs r has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background: transparent;">string table_name;string tablename;class TableInfo{<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">...</span> private: string table_name_; string tablename_;};</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li></ul>17.全局或类里的常量名前加K，且除去k的每个单词开头字母均大写。
<code class="hljs fix has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-attribute" style="box-sizing: border-box;">const Internet kDaysInWeek </span>=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;"> 7;</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul>
18.常规河南省使用大小写混写；取值函数和设置值函数要求与变量名匹配。
<code class="hljs cs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//常规函数：</span>AddTableEntry();<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//取值、设置值函数</span>class MyClass{ <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span>: ... <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> <span class="hljs-title" style="box-sizing: border-box;">num_entries</span>()<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">const</span> {<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> num_entries_;} <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> set_num_entries(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> num_entries){num_entries_=num_entries;} <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">private</span>: <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> num_entries_;};</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li></ul>19.名字空间，用小写字母，基于项目名称和目录结构：
<code class="hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background: transparent;">google_awesome_project</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul>
最后就是一点关于格式的规范：
20. 每行不超过80
21.尽量不适用非ASCII字符，使用时必须用UTF-8编码
22.只是用空格，每次缩进两个空格，不适用TAB
23.关键字public protected private要缩进一个空格
24.一些关于一行写不下，对齐的问题。
…..
只是简单看看了，觉得比华为之类的编码规范要好的多，继续加油！
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