Question
What does "const Fred& x" mean?
Answers
It means x aliases a Fred object, but x can't be used to change that Fred object.

For example, if class Fred has a const member function called inspect(), saying x.inspect() is OK. But if class Fred has a non-const member function called mutate(), saying x.mutate() is an error (the error is caught by the compiler; no run-time tests are done, which means const doesn't slow your program down).   Your Comment




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