static void stream_do_open(Fstream& s,
const fs::path& path,
const std::ios_base::openmode mode,
typename boost::enable_if<is_std_fstream<Fstream> >::type* = 0)
{
string file(path.external_file_string());
s.open(file.c_str(), mode);
}
static void stream_do_open(Fstream& s,
const Path& path,
const std::ios_base::openmode mode,
typename boost::enable_if<fs::is_basic_path<Path> >::type* = 0,
typename boost::enable_if<is_fs_fstream<Fstream> >::type* = 0)
{
s.open(path, mode);
}