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?
* 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.
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