Add a vector to a vector

Question

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C++: Appending a vector to a vector

Can I easily sum a vector to another vector? What I mean is, push_back a vector to another vector:

{1, 2, 3} + {4, 8} = {1, 2, 3, 4, 8};

Do I have to do this manually:

for (int i = 0; i < to_sum_vector.size(); i++) {
    first_vector.push_back(to_sum_vector.at(i));
}

Or is there a C++/STL way of doing it? Thank you!

Answer 1

You can. The STL way is using insert:

first_vector.insert(first_vector.end(), second_vector.begin(), second_vector.end());

This inserts second_vector into first_vector beginning at the end of first_vector.

Answer 2

dst.insert(dst.end(), src.begin(), src.end() );