C++ STL Vectors: Get iterator from index?

Question

Try this:

vector<Type>::iterator nth = v.begin() + index;

way mentioned by @dirkgently ( v.begin() + index ) nice and fast for vectors

but std::advance( v.begin(), index ) most generic way and for random access iterators works constant time too.

EDIT
differences in usage:

std::vector<>::iterator it = ( v.begin() + index );

or

std::vector<>::iterator it = v.begin();
std::advance( it, index );

added after @litb notes.

Also; auto it = std::next(v.begin(), index);

Update: Needs a C++11x compliant compiler

Or you can use std::advance

vector<int>::iterator i = L.begin();
advance(i, 2);