example1_basic_usage.cpp

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#include <functional>
#include <iostream>

int main() {
    int x = 10;
    std::reference_wrapper<int> ref = x;
    int x1 = 10;
    const int& y1 = x1;
    y1 = 30;
    std::cout << "updated x1: " << x1 << std::endl;
    
    std::cout << "Value: " << ref << std::endl;
    
    ref.get() = 20;
    std::cout << "Updated value: " << x << std::endl;
    
    return 0;
}