Here are some possible titles, based on the content of your article: Concise, direct title: * What is std::string_view and why should I use it? * std::string_view: Efficiency and Memory Safety in C 17 * Why std::string_view is a Game Changer for C Develo

Deep understanding of std::string_view

In the C library base TS (N3921) added in C++17, std:: was proposed. string_view function. It is a type that represents a view of a container that can be viewed as a string.

FAQs and Answers

1. What is string_view?

Yes, your understanding of string_view is correct. It is a type that represents a view of any type of container that can be treated as a string.

2. Should the canonical const std::string& parameter type be changed to string_view?

Yes, it is recommended to gradually change the canonical const std::string& parameter type to string_view. This change improves efficiency because string_view only stores the pointer and size without copying the actual string content.

3. Are there any other important things to note about string_view?

• Memory Safety: Unlike most other classes in the standard library, std::string_view does not own the data it references after it is created. This can cause dangling pointer exceptions and needs careful consideration.

＊ Special usage: If std::string_view is created from a non-STL string type (such as Qt's QString), use std after the original string goes out of scope The behavior of ::string_view is undefined or can cause unexpected results.

Conclusion

std::string_view is a useful type that can improve the efficiency of your application while reducing copy operations. Understanding its memory semantics and following best practices is critical to avoiding potential problems.

The above is the detailed content of Here are some possible titles, based on the content of your article: Concise, direct title: * What is std::string_view and why should I use it? * std::string_view: Efficiency and Memory Safety in C 17 * Why std::string_view is a Game Changer for C Develo. For more information, please follow other related articles on the PHP Chinese website!