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std::any:: swap

From cppreference.net
C++
Utilities library
std::any
void swap ( any & other ) noexcept ;
(since C++17)

Swaps the content of two any objects.

Parameters

other - object to swap with

Example

Run this code 
#include <any>
#include <print>
#include <string>
#include <string_view>
int main()
{
    std::any a = std::string{"King"};
    std::any b = std::string_view{"Queen"};
    std::println("a = {}", std::any_cast<std::string&>(a));
    std::println("b = {}", std::any_cast<std::string_view&>(b));
    std::println("swap(a, b)");
    a.swap(b);
    std::println("a = {}", std::any_cast<std::string_view&>(a));
    std::println("b = {}", std::any_cast<std::string&>(b));
}

Output: 

a = King
b = Queen
swap(a, b)
a = Queen
b = King