C++ <cstring> 和 <string> 的区别
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Difference between <cstring> and <string>
提问by Dante May Code
Earlier today (actually yesterday due to my time-zone) I was attempting a programming interview using Visual Studio 2012for C++ on Interview Street (which uses g++).
今天早些时候（实际上是昨天，由于我的时区），我在Interview Street（使用g++）尝试使用Visual Studio 2012for C++ 进行编程面试。
To be brief, I came across several compilation errors1when I was using
简而言之，我在使用时遇到了几个编译错误1
#include <cstring>
which was provided by the skeleton code in one of the question, and after turning to
这是由问题之一中的骨架代码提供的，然后转向
#include <string>
all compilation errors magically disappeared.
所有编译错误都神奇地消失了。
However, upon submission to Interview Street, I had to add cback; otherwise I got compilation errors.
然而，在提交给Interview Street后，我不得不加c回来；否则我会遇到编译错误。
It was the first time I was bitten by non-standardization....
这是我第一次被非标准化所咬......
My question is: what inside <string>and <cstring>took me (precious) more than half an hour?
我的问题是：什么里面<string>和<cstring>我花了（珍贵）超过半小时？
1For anyone who is curious:
1对于任何好奇的人：
One error by Visual Studio 2012 if using <cstring>is:
Visual Studio 2012 的一个错误using <cstring>是：
error C2338: The C++ Standard doesn't provide a hash for this type.
错误 C2338：C++ 标准不提供此类型的散列。
in
在
c:\program files (x86)\microsoft visual studio 11.0\vc\include\xstddef
c:\程序文件 (x86)\Microsoft Visual Studio 11.0\vc\include\xstddef
possibly for stringas key in unordered_map
可能string因为关键unordered_map
One error by g++ if using <string>is:
g++ 的一个错误using <string>是：
'strlen' was not declared in this scope
'strlen' 未在此范围内声明
采纳答案by Rob Kennedy
The cstringheader provides functions for dealing with C-style strings — null-terminated arrays of characters. This includes functions like strlenand strcpy. It's the C++ version of the classic string.hheader from C.
所述cstring头部提供的功能与C语言风格的处理字符串-字符空终止阵列。这包括像strlen和这样的函数strcpy。它是来自 C 的经典string.h头文件的 C++ 版本。
The stringheader provides the std::stringclass and related functions and operators.
所述string头提供的std::string类和相关功能和操作符。
The headers have similar names, but they're not really related beyond that. They cover separate tasks.
标题具有相似的名称，但除此之外它们并没有真正相关。它们涵盖不同的任务。
回答by juanchopanza
<cstring>has the C string code from the C header string.h. C++has a convention where Cheaders have the same base name, except for a leading cand no trailing .h. All the contents are available under the std::namespace.
<cstring>具有来自 C 头文件 string.h 的 C 字符串代码。C++有一个约定，其中C标头具有相同的基本名称，除了前导c和没有尾随.h. 所有内容都在std::命名空间下可用。
<string>has the standard library std::stringand related functions
<string>有标准库std::string及相关功能
回答by Rudolf Mühlbauer
In C++, you wouldn't use #include <somefile.h>, but instead #include <somefile>. Now C++ has its string classes in <string>, but the c-string functions are also available, which would be in <string.h>. C++ uses for 'traditional' c- include files. Therefore, <cstring>and <string>
在 C++ 中，您不会使用#include <somefile.h>, 而是#include <somefile>. 现在 C++<string>在<string.h>. C++ 用于“传统”c-包含文件。因此，<cstring>和<string>
