Read UTF8 stream file into a Windows.Data.Json.JsonObject isntance

json_utf8_read.cpp

// Opens a file by path name. Assumes the file is UTF-8 encoded. If the file
// has a BOM, it'll be skipped so the first access to the file is positioned
// correctly.
std::wifstream open_utf8_with_maybe_bom(std::filesystem::path const& path)
{
    std::wifstream ss;
    ss.imbue(std::locale(".utf-8"));
    ss.open(path);

    if (ss.good() && (ss.peek() == 0xFEFF))
        (void)ss.get();

    return ss;
}

void read_json_file(std::filesystem::path const& path)
{
    auto stream = open_utf8_with_maybe_bom(path);
    auto obj = winrt::Windows::Data::Json::JsonObject::Parse((std::wstringstream{} << stream.rdbuf()).str());
    std::wcout << obj.ToString().c_str() << std::endl;
}