Process Sensor Reading

#include <iostream>

void process(const int &t){
    std::cout << "readonly";
}

void process(int &val) {
    val <<= 1; 
}



int main() {
    int x;
    std::cin >> x;

    if (x < 0) {
        process(static_cast<const int&>(x));   // call read-only overload
    } else {
        process(x);                            // call modifying overload
        std::cout << x;
    }

    return 0;
}

Solving Approach