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    Upvotes14Top Answeredited Dec 15, 2012 at 0:24

    If you really need 2 vectors, and you can't use GMan's suggestion in the comments:

    // where v1 is your original vector
    std::vector<T> v2(
    std::make_move_iterator(v1.begin() + v1.size()/2),
    std::make_move_iterator(v1.end()));
    v1.erase(v1.begin() + v1.size()/2, v1.end());

    It's still O(n), but you can't do any better than that.

    If you need to keep the original vector separate:

    std::vector<T> v2(v1.begin(), v1.begin() + v1.size()/2),
    v3(v1.begin() + v1.size()/2, v1.end());
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