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boost::signals2::dummy_mutex — Fake mutex which does nothing.
// In header: <boost/signals2/dummy_mutex.hpp> class dummy_mutex : public noncopyable { public: void lock(); bool try_lock(); void unlock(); };
You may wish to use the dummy_mutex class for the Mutex
          template type of your signals if you are not concerned about thread safety.
          This may give slightly faster
          performance, since dummy_mutex performs no actual locking.
          
void lock();
No effect.
bool try_lock();
No effect.
| Returns: | 
 | 
void unlock();
No effect.