How to construct a std::string from a std::vector?

Question

I\'d like to build a std::string from a std::vector.

I could use std::stringsteam, but imagine there is a s

Answer 1

If requires no trailing spaces, use accumulate defined in with custom join lambda.

#include 
#include 
#include 

using namespace std;


int main() {
    vector v;
    string s;

    v.push_back(string("fee"));
    v.push_back(string("fi"));
    v.push_back(string("foe"));
    v.push_back(string("fum"));

    s = accumulate(begin(v), end(v), string(),
                   [](string lhs, const string &rhs) { return lhs.empty() ? rhs : lhs + ' ' + rhs; }
    );
    cout << s << endl;
    return 0;
}

Output:

fee fi foe fum