How to write a std::string to a UTF-8 text file

Question

I just want to write some few simple lines to a text file in C++, but I want them to be encoded in UTF-8. What is the easiest and simple way to do so?

Answer 1

My preference is to convert to and from a std::u32string and work with codepoints internally, then convert to utf8 when writing out to a file using these converting iterators I put on github.

#include 

int main()
{
    using namespace utf;

    u32string u32_text = U"ɦΈ˪˪ʘ";
    // do stuff with string
    // convert to utf8 string
    utf32_to_utf8_iterator pos(u32_text.begin());
    utf32_to_utf8_iterator end(u32_text.end());

    u8string u8_text(pos, end);

    // write out utf8 to file.
    // ...
}