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C++ class to prevent object copies

The C++, if you wao prevent object copies of a class, you can achieve this by declaring a private copy constructor and a private copy assignment operator (operator=). By making these members private, you prevent other code from making copies of objects of that class. This is often referred to as disabling or deleting the copy constructor and copy assignment operator. Here’s an example:

C++
class NoCopyClass {
public:
    // Public constructor
    NoCopyClass(int value) : data(value) {}

    // Public member function
    void printData() const {
        std::cout << "Data: " << data << std::endl;
    }

private:
    int data;

    // Private copy constructor (disabled)
    NoCopyClass(const NoCopyClass& other) = delete;

    // Private copy assignment operator (disabled)
    NoCopyClass& operator=(const NoCopyClass& other) = delete;
};

int main() {
    NoCopyClass obj1(42);
    obj1.printData();

    // Attempting to create a copy will result in a compilation error
    // NoCopyClass obj2 = obj1; // Error: use of deleted function

    return 0;
}

In this example:

  • We define a class called NoCopyClass with a private data member and a public constructor and member function.
  • We make the copy constructor and copy assignment operator private and use the = delete syntax to explicitly disable them.
  • In the main function, we create an object obj1 of NoCopyClass and use its public member function.
  • If you attempt to create a copy of obj1, like NoCopyClass obj2 = obj1;, it will result in a compilation error due to the deleted copy constructor and copy assignment operator.

By disabling the copy operations in this manner, you ensure that objects of the NoCopyClass cannot be copied, enforcing a design choice that prevents unintentional object copies.

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