包括< xstring>，< cstring>，< string>和< wstring>在C ++中 [英] Differences among including <xstring>, <cstring>, <string> and <wstring> in C++

问题描述

我看到以下 #include 指令：

#include <xstring>

#include <cstring>

#include <string>

#include <wstring>

这些包含指令有什么区别？

What are the differences among these include directives? Did I miss any others that should be considered part of this group?

推荐答案

< string> / code>是 std :: string 的定义。

; xstring> 是一个Microsoft C ++头文件，其中包含 std :: basic_string 模板的实际实现。您不需要包括< xstring> 自己。 < string> 包括 basic_string 实现。

<xstring> is a Microsoft C++ header containing the actual implementation of the std::basic_string template. You never need to include <xstring> yourself. <string> includes it for the basic_string implementation.

< cstring> 是标准C字符串库（ strcpy ， strcat ，等）放置到C ++ std 命名空间中。

<cstring> is the standard C string library (strcpy, strcat, etc) placed into the C++ std namespace.

wstring 不是我知道的头文件。 std :: wstring 是 wchar_t 版本 std :: string 并且在包括< string> 时定义。

wstring is not a header file that I'm aware of. std::wstring is the wchar_t version of std::string and is defined when including <string>.

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