What are the best practices for using string_view in C++17?

What are the best practices for using string_view in C++17?

When using string_view in C++17, it's important to ensure that the underlying string data remains valid for the lifetime of the string_view. Avoid using string_view with temporary strings.

Can you explain why I shouldn't use it with temporary strings?

Using string_view with temporary strings can lead to dangling references. Once the temporary string goes out of scope, the string_view will point to invalid memory.

Are there any performance benefits to using string_view?

Yes, string_view can improve performance by avoiding unnecessary string copies, especially when passing strings to functions.

What about using string_view with std::string?

You can safely create a string_view from a std::string, but be cautious about the lifetime of the std::string. As long as the std::string is alive, the string_view will be valid.