String concatenation

Question

I want to combine vector<string>into one string, separated by spaces. For example,

sample
string
for
this
example

should become "sample string for this example".
What is the easiest way to do this?

Answer 1

#include <iterator>
#include <iostream>
#include <sstream>
#include <vector>
#include <algorithm>

std::vector<std::string> v;
...

std::stringstream ss;
std::copy(v.begin(), v.end(), std::ostream_iterator<std::string>(ss, " "));
std::string result = ss.str();
if (!result.empty()) {
    result.resize(result.length() - 1); // trim trailing space
}
std::cout << result << std::endl;

Answer 2

boost :: join