Convert a vector<vector<char>> into a vector<string>

Question

I've got a

std::vector<std::vector<char>> and want to fill a std::vector<string> with its content.

I just can't get my head into thinking how to access the inner vector of and put the chars into a string vector.

Maybe I'm wrong, but I think a std::vector<char> is like a string. So it should not be hard to do and I'm just stuck somewhere in my mind.

I've seen this: vector<string> or vector< vector<char> >? but it didn't got me far.

Thanks for your help.

Answer 1

Here's an algorithm version

std::vector<std::vector<char>> a;
std::vector<std::string> b;

std::transform(a.begin(), a.end(), std::back_inserter(b),
[](std::vector<char> const& v) -> std::string {
  return {v.begin(), v.end()};
});

Answer 2

The naive solution should work well enough:

std::vector<std::string>
chars_to_string(std::vector<std::vector<char>> const & in)
{
    std::vector<std::string> out;
    out.reserve(in.size());
    for (auto const & v : in)
        out.emplace_back(v.begin(), v.end());
    return out;
}