与boost :: filesystem :: unique_path()等效的C ++ 17是什么? [英] What is the C++17 equivalent to boost::filesystem::unique_path()?

问题描述

std :: filesystem ，而许多C ++ 17之前的编译器的 std :: experimental :: filesystem ，均基于 boost :: filesystem ，几乎所有这些都可以移植到较新的std.

std::filesystem on C++17, and std::experimental::filesystem for many pre-C++17 compilers, are based on boost::filesystem and almost all of it is obvious to port to the newer std.

但是我看不到与 boost :: filesystem :: unique_path()等效的 std :: filesystem .

But I see no std::filesystem equivalent to boost::filesystem::unique_path().

std中有没有引起我注意的等效项吗?还是我应该采用一种推荐的方法来模仿实现?

Is there an equivalent in std that I'm not noticing? Or is there a recommended approach I should take to mimic the implementation?

当我的代码注意到它在支持 std :: filesystem 和的平台上编译时，我真的希望替换 boost :: filesystem 依赖项unique_path()是我转换中唯一不明显的部分.

I'm really hoping to replace the boost::filesystem dependency when my code notices it's compiling on a platform that supports std::filesystem, and unique_path() is the only not obvious part of my conversion.

推荐答案

unique_path 已被删除，因为它是恶意软件的潜在攻击媒介.在调用 unique_path 和在该位置打开文件之间存在一个机会之窗，在此期间其他一些过程可以创建相同的文件.根据用户对文件的处理方式，这可能会或可能不会构成安全漏洞.POSIX函数 tmpnam .

unique_path was removed because it was a potential attack vector for malware. There is a window of opportunity between calling unique_path and opening a file at that location during which some other process could create the same file. Depending on what the user does with the file, this may or may not constitute a security vulnerability. A similar issue exists with the POSIX function tmpnam.

如此讨论所述，该问题将在下一版的文件系统库.在此之前，您可以继续使用 Boost.Filesystem ，使用 std :: tmpnam < cstdio> 中提供的功能，或者使用更安全的平台特定替代方案，例如 mkstemp .

As noted in this discussion, this issue will be dealt with in the next iteration of the Filesystem library. Until then, you can either continue using Boost.Filesystem, use the std::tmpnam function provided in <cstdio>, or use safer platform-specific alternatives like mkstemp.

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