void
Gtk::ListStore::set_value(const TreeIter& iter, int column, const char *str)
{
	G::Value value(gtk_list_store()->column_headers[column]);
	value.set(String(str));
	gtk_list_store_set_value(gtk_list_store(), iter, column,value.g_value());
}

The "GValue" struct does not properly deallocate.

Correct is:

void
Gtk::ListStore::set_value(const TreeIter& iter, int column, const char *str)
{
	G::Value value(gtk_list_store()->column_headers[column]);
	value.set(String(str));
	gtk_list_store_set_value(gtk_list_store(), iter, column,value.g_value());
	g_value_unset( value.g_value() );
	g_free( value.g_value() );
}

See other similar functions in ".inl" file .