Re: strange behaviour with `substr()` function

[Marcin Kolny <marcin kolny gmail com>]

I see nothing wrong with that. Then if I use the `substr()` function, I

don't understand why I got, for the case (0,4): gtkm and for the case
(1.5) gtkmm.

substr() method internally creates a new Glib::ustring object using constructor [1] (actually, it's the same behavior as substr() from std::string [2]). So, substr(0, 4) means: get 4 characters from string, but start from index 0. Four first letters of "gtkmm" string are 'g', 't', 'k' and 'm'. 

[1] https://developer.gnome.org/glibmm/stable/classGlib_1_1ustring.html#a37655e890b5cb3a2f0fc862b85ba29cc
[2] http://www.cplusplus.com/reference/string/string/substr/

--

Best regards,
Marcin Kolny