c_gtk_binding_entry_add_signal

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
__gshared extern (C)
void function(GtkBindingSet* bindingSet, uint keyval, GdkModifierType modifiers, const(char)* signalName, uint nArgs, ...) c_gtk_binding_entry_add_signal;

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