C++ <string> 和 <string.h> 的区别？
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Difference between <string> and <string.h>?
提问by Valmond
How come this code
这个代码怎么来的
std::map <std::string , int> m;
m["a"]=1;
compiles with (I'm using MSVC 2010)
编译（我使用的是 MSVC 2010）
#include <string>
but not with
但不是与
#include <string.h>
?
?
回答by Ajay
<string.h>contains old functions likestrcpy,strlenfor C style null-terminated strings.<string>primarily contains thestd::string,std::wstringand other classes.
<string.h>包含旧函数，如strcpy,strlen用于 C 风格的空终止字符串。<string>主要包含std::string,std::wstring和其他类。
回答by Prasoon Saurav
string.his a C header not a C++ header, period!
string.h是 C 头文件而不是 C++ 头文件，句号！
回答by matiu
<string.h>is cstring - http://www.cplusplus.com/reference/clibrary/cstring/
<string.h>是 cstring - http://www.cplusplus.com/reference/clibrary/cstring/
<string>is the c++ string class - http://www.cplusplus.com/reference/string/
<string>是 C++ 字符串类 - http://www.cplusplus.com/reference/string/
Edit per Nicol Bolas comment below and a bit of googling:
根据下面的 Nicol Bolas 评论和一些谷歌搜索进行编辑：
<cstring>will usually import the same things as <string.h>but into the stdnamespace.
<string.h>will usually import everything into the global namespace.
It appears to depend on the library implementation you're using though according to my googling.
<cstring>通常会将与<string.h>but相同的东西导入std命名空间。
<string.h>通常会将所有内容导入全局命名空间。根据我的谷歌搜索，它似乎取决于您正在使用的库实现。
Personally I only ever use <cstring>if I need C style string helpers.
我个人只<cstring>在需要 C 样式字符串助手时才使用。
回答by Abhijeet Rastogi
string.his C's header file while stringis C++'s header file.
string.h是C的头文件，string而是C++的头文件。
回答by Nicol Bolas
<string.h>contains C-library string functions. strlen, strcmp, etc.
<string.h>包含 C 库字符串函数。strlen，strcmp等等。
<string>contains the definition for std::basic_string, which has the typedefs std::stringand std::wstring. That's the difference.
<string>包含 for 的定义std::basic_string，它具有 typedefsstd::string和std::wstring. 这就是区别。
They really have no relationship at all, outside of the fact that they both deal with strings.
除了它们都处理字符串这一事实之外，它们真的没有任何关系。
回答by Sanish
They are entirely different headers.
它们是完全不同的标题。
<string>is C++ stringclass
<string>是 C++string类
<string.h> or <cstring>defines functions to manipulate C strings and arrays
<string.h> or <cstring>定义操作 C 字符串和数组的函数
回答by jpstrube
I believe <string.h>is just used for C and <string>for C++. So including string.hwont work.
我相信<string.h>仅用于 C 和<string>C++。所以包括string.h不会工作。
回答by Zeta
As stated, string.hand cstringare C headers (while cstringis basically a C++ wrapper for string.h), containing functions for C strings, which are char[]terminated by '\0'. You want to use the c++ class string, which header is <string>.
如上所述，string.h并且cstring是 C 头文件（虽然cstring基本上是 的 C++ 包装器string.h），包含 C 字符串的函数，这些函数char[]以'\0'. 您想使用 C++ 类字符串，其标头是<string>.
回答by PankajSingh
<string.h>is a C standard library header while <string>is a cpp in fact all the c standard header files have .hextension an non of cpp have .h.
<string.h>是一个 C 标准库头文件，而<string>实际上是一个 cpp，所有的 c 标准头文件都有.h扩展名，非 cpp 有.h。
回答by James Liu
string.h is for c compatible c++ string class string is for pure c++ string class
string.h 适用于与 C 兼容的 C++ 字符串类 string 适用于纯 C++ 字符串类
