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Easily understand c++17's string_view

std::string_view It is a lightweight, non-owning string view class introduced in C++ 17. It is designed to provide an efficient and convenient way to operate strings without copying string data, thereby improving performance. The following isstd::string_view A detailed introduction to , including its design intention and common usage.

Design Intentions

1. Efficiency：std::string_view Provides a way to operate strings without copying string data. This is very useful for scenarios where large amounts of string data need to be passed or processed, because it avoids unnecessary memory allocation and data copying.
2. Simplicity:use std::string_view It can avoid tedious character pointer operations and provide similarstd::string The interface makes the code easier to read and maintain.
3. compatibility：std::string_view Can be seamlessly integrated with existing string processing code. It can convert from C-style strings (const char*）、std::string etc., and provide interfaces to interoperate with these types.

Common usage

structure std::string_view

std::string_view Can be constructed from a variety of string types:

cpp
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#include 
                                   

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