std::basic_string_view<CharT,Traits>::swap

#include <iostream>
#include <string_view>
 
int main() 
{
    std::string_view a = "AAA";
    std::string_view b = "BBBB";
 
    std::cout << "Before swap:\n"
                 "a = " << a << "\n"
                 "b = " << b << "\n\n";
 
    a.swap(b);
 
    std::cout << "After swap:\n"
                 "a = " << a << "\n"
                 "b = " << b << '\n';
}

Output:

Before swap:
a = AAA
b = BBBB

After swap:
a = BBBB
b = AAA