和之间的区别?

How come this code

这段代码怎么

std::map <std::string , int> m;
m["a"]=1;

compiles with (I'm using MSVC 2010)

使用(我使用MSVC 2010)

#include <string>

but not with

但不与

#include <string.h>

吗?

8 个解决方案

#1

<string.h> contains old functions like strcpy, strlen for C style null-terminated strings.
<字符串。h> 包含像strcpy, strlen这样的旧函数，用于C样式的空终止字符串。
<string> primarily contains the std::string, std::wstring and other classes.
主要包含std::string、std::wstring和其他类。

#2

string.h is a C header not a C++ header, period!

字符串。h是一个C头，不是一个c++头，句号!

#3

<string.h> is cstring - http://www.cplusplus.com/reference/clibrary/cstring/

<字符串。h> 是cstring - http://www.cplusplus.com/reference/clibrary/cstring/。

<string> is the c++ string class - http://www.cplusplus.com/reference/string/

是c++ string类- http://www.cplusplus.com/reference/string/。

Edit per Nicol Bolas comment below and a bit of googling:

编辑每个Nicol Bolas评论和一些谷歌搜索:

<cstring> will usually import the same things as <string.h> but into the std namespace. <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.

通常会导入与相同的东西。h>，但进入std名称空间。 <字符串。h> 通常将所有内容导入到全局名称空间中。它似乎取决于你使用的库实现，但根据我的谷歌。

Personally I only ever use <cstring> if I need C style string helpers.

我个人只使用，如果我需要C样式的字符串助手。

#4

string.h is C's header file while string is C++'s header file.

字符串。h是C的头文件，而字符串是c++的头文件。

#5

<string.h> contains C-library string functions. strlen, strcmp, etc.

<字符串。h> 包含c库字符串函数。函数比较字符串等。

<string> contains the definition for std::basic_string, which has the typedefs std::string and std::wstring. That's the difference.

包含std::basic_string的定义，它有typedefs std::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.

他们根本没有关系，除了他们都处理字符串。

#6

They are entirely different headers.

它们是完全不同的标题。

<string> is C++ string class

是c++ string类。

<string.h> or <cstring> defines functions to manipulate C strings and arrays

<字符串。h> 或定义了操作C字符串和数组的函数。

#7

As stated, string.h and cstring are C headers (while cstring is 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,字符串。h和cstring是C头(而cstring基本上是字符串的c++包装器)，包含了C字符串的函数，这些函数是由“\0”终止的。您想要使用c++类字符串，它的头是。

#8

I believe <string.h> is just used for C and <string> for C++. So including string.h wont work.

我认为 <字符串。h> 只是用于C和 for c++。所以包括字符串。h不会工作。

#1

<string.h> contains old functions like strcpy, strlen for C style null-terminated strings.
<字符串。h> 包含像strcpy, strlen这样的旧函数，用于C样式的空终止字符串。
<string> primarily contains the std::string, std::wstring and other classes.
主要包含std::string、std::wstring和其他类。

#2