CODEWITHSUNDEEP
c++stringc++11vectorstl
jan
jan

Reputation: 221

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

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.

Upvotes: 7

Views: 844

Answers (4)

Mantosh Kumar
Mantosh Kumar

Reputation: 5731

This should work 

std::vector<string> vec;
for(std::vector<std::vector<char>>::iterator itr = source.begin(); 
    itr != source.end(); ++itr) {
    vec.push_back(std::string(itr.begin(),itr.end()));
);

Upvotes: 3

manlio
manlio

Reputation: 18902

I think you can just do:

std::vector<char> v_char;
std::string my_string(v_char.begin(), v_char.end());

or also (requires C++11 and the vector of char must be NULL terminated):

std::string my_string(v_char.data());

Once you have the std::string, filling a vector is easy.

Upvotes: 2

user657267
user657267

Reputation: 20990

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()};
});

Upvotes: 13

Kerrek SB
Kerrek SB

Reputation: 476930

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;
}

Upvotes: 11

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