c++ - How do I erase an element from std::vector by index?

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I have a std::vector, and I
want to delete the n'th element. How do I do
that?

std::vector
            vec;

vec.push_back(6);
vec.push_back(-17);
vec.push_back(12);


vec.erase(???);

Answer

To delete a single element, you could
do:

std::vector
            vec;

vec.push_back(6);
vec.push_back(-17);
vec.push_back(12);


//
            Deletes the second element (vec[1])
vec.erase(vec.begin() +
            1);

Or, to delete more
than one element at once:

//
            Deletes the second through third elements (vec[1],
            vec[2])
vec.erase(vec.begin() + 1, vec.begin() +
            3);