How have we previously seen the const keyword used (in both C and C++)?



But, the C++ textbook has this to say about const:



So we won't consider all of the details, but let's take a brief look at a very common and useful application of const in C++:

What does const mean in this copy constructor declaration?  (Note: This use of const is probably typical for a copy constructor.)


It means that the source object may not be modified within this function.  


And, what does it mean in the declaration of this member function?


It indicates that this function can be safely called on a const instance of this class (like source in the copy constructor above) without modifying the object.