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

You could use the std::accumulate() standard function from the header (it works because an overload of operator + is defined for strings which returns the concatenation of its two arguments):

#include 
#include 
#include 
#include 

int main()
{
    std::vector v{"Hello, ", " Cruel ", "World!"};
    std::string s;
    s = accumulate(begin(v), end(v), s);
    std::cout << s; // Will print "Hello, Cruel World!"
}

Alternatively, you could use a more efficient, small for cycle:

#include 
#include 
#include 

int main()
{
    std::vector v{"Hello, ", "Cruel ", "World!"};
    std::string result;
    for (auto const& s : v) { result += s; }
    std::cout << result; // Will print "Hello, Cruel World!"
}