I still don't see the problem. There is an overload that takes a reference instead and should be in each case.
So, for *sigc::mem_fun * *(* *T_obj * * *_A_obj*, *T_return(T_obj2::*)(T_arg1, T_arg2) * *_A_func* *)* you should substitute *sigc::mem_fun * *(* *T_obj & * *_A_obj*, *T_return(T_obj2::*)(T_arg1) * *_A_func* *)* These are immediately adjacent in the docs: https://developer.gnome.org/libsigc++/stable/group__mem__fun.html#ga0df7af9f32990cc624c4bb60782b4f78 or did I miss something else and this doesn't work for you somehow?
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