mapping of Gtk3::main_iteration

[Juergen Harms <juergen harms unige ch>]

Hello,

When I run

if (Gtk3:::event_spending () ) { Gtk3->main_iteration (); }

to get my display updated while waiting for piped input, this loop does 
what I expect it to do, but also produces the following error message

Gtk3::main_iteration: passed too many parameters (expected 0, got 1); 
ignoring excess at ...

Am I doing something wrong? is this a mapping error?