Explanation of const reference in C++

As we all know, we can bind a reference to a const object and call it a reference to a constant. Unlike ordinary ordinary references, a constant reference cannot modify the object

to Note that it is not correct for a non-const reference to point to a constant object, but a constant reference can point to a non-constant object

such as:

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const int c1 = 42;

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int i = 42;

int &r1 = c1;//Attempting to make a non-const reference point to a constant object will report an error

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const int &r2 = i;//Correct, allows const int& to bind to a normal int