Convert iterator to pointer?

Question

I have a std::vector with n elements. Now I need to pass a pointer to a vector that has the last n-1 elements to a function.

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Answer 1

If your function really takes vector * (a pointer to vector), then you should pass &foo since that will be a pointer to the vector. Obviously that will not simply solve your problem, but you cannot directly convert an iterator to a vector, since the memory at the address of the iterator will not directly address a valid vector.

You can construct a new vector by calling the vector constructor:

template  vector(InputIterator, InputIterator)

This constructs a new vector by copying the elements between the two iterators. You would use it roughly like this:

bar(std::vector(foo.begin()+1, foo.end());