how to concat two stl vectors?

Question

how to concat two stl vectors?

Answer 1

I would use the insert function Something like:

vector<int> a, b;
//fill with data
b.insert(b.end(), a.begin(), a.end());

Answer 2

vector1.insert( vector1.end(), vector2.begin(), vector2.end() );

Answer 3

std::vector<int> first;
std::vector<int> second;

first.insert(first.end(), second.begin(), second.end());

Answer 4

Or you could use:

std::copy(source.begin(), source.end(), std::back_inserter(destination));

This pattern is useful if the two vectors don't contain exactly the same type of thing, because you can use something instead of std::back_inserter to convert from one type to the other.