Copy vector element of a vector to another vector

Question

I have this vector,

std::vector <std::vector<std::string> > gname;

gname.push_back(std::vector<std::string>({"John","jake"}));
gname.push_back(std::vector<std::string>({"May", "harold}));

and I want to put all the values from gname to,

std:vector<std::string> cname;

It this possible using c++11?

It ever was possible, no matter of C++11. Or did you ask about something specific from ``? — πάντα ῥεῖ, Nov 02 '15 at 00:28
yes that can be done, but is there any one liner using c++11? — domlao, Nov 02 '15 at 00:39
Possible duplicate of [this](http://stackoverflow.com/q/6404856/1062948) question. — crayzeewulf, Nov 02 '15 at 00:48

score 3 · Accepted Answer · answered Nov 02 '15 at 00:55

3

Here's a one liner. Nothing fancy, but it's readable...

for (auto& vec : gname) { cname.insert(cname.end(), vec.begin(), vec.end()); }

answered Nov 02 '15 at 00:55

Karoly Horvath

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score 0 · Answer 2 · answered Nov 02 '15 at 00:57

To complement Karolys fine one-liner. Here is one using <algorithm>

std::for_each(gname.begin(), gname.end(), 
        [&cname](const std::vector<std::string>& stuff){
    cname.insert(cname.end(), stuff.begin(), stuff.end());});

Debatable if it qualifies as a one-liner though.

Copy vector element of a vector to another vector

2 Answers2