On 2/11/18 9:52, Edward Bartolo wrote:
> Trial and error?! I thought, it was only low intellects who do that!

LOL, i don't think so!

As Mattias Ellert said:

It looks like a typo (a missing &). The other 4 gobj() methods say "return &gobject":

$ grep 'gobj() {' /usr/include/glibmm-2.4/glibmm/threads.h
GMutex* gobj() { return &gobject_; }
GRecMutex* gobj() { return &gobject_; }
GRWLock* gobj() { return &gobject_; }
GCond* gobj() { return &gobject_; }
GPrivate* gobj() { return gobject_; }