Question

How to create a member function with read-only reference parameter in C++

Answer 1

// const int& n - const = read only reference

#include <iostream>
  
class Example {
    public:
        Example() {};
        void change(int& n) {
            n = 600;
        }
        void cannotchange(const int& n)  {
            // n = 871; // error: assignment of read-only reference 'n'
        }
};
      
 
int main() {
    Example obj;
    int num;
    
    obj.change(num);
    std::cout << num << "\n";
}

    
    
/*
run:
    
600
    
*/

 

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