boost mutex strange error with private member

Question

I have a strange error.

class INST
{
public:
boost::mutex m_mutex;
};

std::vector m_inst;

error C2248: \'boost::mutex::mutex\' :

Answer 1

mutexes can't be copied, so you can't place them in a container which would copy the mutex. The error is likely referring to the private copy constructor of the mutex.