Suppose we are given an STL vector container named vec that holds values of type double. What do each of vec[vec.size()-1], vec.back(), *(vec.end()-1), *(vec.begin()+vec.size()-1)and *vec.rbegin() mean?
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They all evaluate to the last element of the container. The first expression
gives the vector the largest legal index, producing the last element. The second
expression returns the back element. The third starts with an iterator one past the end,
and move one towards the front. Dereferencing give the last element. The next
expression begins with an iterator to the first element, adds one less than the size,
giving an iterator to the last element. Dereferencing gives the last element. Finally,
the rbegin() member returns an iterator to the last element (the beginning
element in reverse traversal of the vector elements). Dereferencing gives the last
element.
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