In C++, basic types (e.g., int, double) can be passed to a function by reference using the & operator in the parameter declaration. This allows the function to directly modify the argument's value, without copying.

Example:

void increment(int& value) {
    value += 1;
}

int main() {
    int a = 5;
    increment(a); // a becomes 6
    return 0;
}

This way, passing by reference is efficient and allows the function to modify the original data.

Eelmine Edasi