SFML utf8

utf8.cpp

#include <iostream>
#include <fstream>
#include <string>
#include <iterator>
#include <SFML/System/String.hpp>
#include <SFML/System/Utf.hpp>

using namespace std;

sf::String fromUtf8(const string &in)
{
    basic_string<sf::Uint32> tmp;
    sf::Utf8::toUtf32(in.begin(), in.end(), back_inserter(tmp));
    return sf::String(tmp);
}

string toUtf8(const sf::String &str)
{
    string out;
    sf::Utf32::toUtf8(str.begin(), str.end(), back_inserter(out));
    return out;
}

int main()
{
    ifstream fin("in.txt");
    string in;
    getline(fin, in);

    cout << in.size() << endl;
    sf::String str = fromUtf8(in);

    cout << str.getSize() << endl;

    string out = toUtf8(str);
    cout << out.size() << endl;

    ofstream fout("out.txt");
    fout << out << endl;

    return 0;
}