std::basic_string_view<CharT,Traits>::operator=

constexpr basic_string_view& operator=( const basic_string_view& view ) noexcept = default;

(since C++17)

Replaces the view with that of view.

view

view to copy

*this.

Constant.

#include <iostream>
#include <string_view>
int main()
{
    std::string_view v = "Hello, world";
    v = v.substr(7);
    std::cout << v << '\n';
}

Output:

world