Correctly reading a utf-16 text file into a string without external libraries?

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The C++11 solution (supported, on your platform, by Visual Studio since 2010, as far as I know), would be:

#include <fstream>
#include <iostream>
#include <locale>
#include <codecvt>
int main()
{
    // open as a byte stream
    std::wifstream fin("text.txt", std::ios::binary);
    // apply BOM-sensitive UTF-16 facet
    fin.imbue(std::locale(fin.getloc(),
       new std::codecvt_utf16<wchar_t, 0x10ffff, std::consume_header>));
    // read     
    for(wchar_t c; fin.get(c); )
            std::cout << std::showbase << std::hex << c << '\n';
}

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