Because the parameters can be null, we should add method overloads that
omit the parameters. It may be necessary to add an extra method with a
different name for this.
We might also want to pass NULL instead of "" when the strings are
empty.
If you used Glib::File instead of ustring you could overload these:
explicit guess_language(const Glib::File& file, const Glib::ustring&
content_type = "");
explicit guess_language(const Glib::ustring& content_type);
But I'm not sure if you want to use explicit, because it's still not
usual C++...
Regards,
michi7x7
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