[Boost-users] How to create array of boost::interprocess::interprocess_mutex in maped file

I think here may be the good place to get some help or instruction. So I post my question here. Thanks in advance. I'd like to create array interprocess_mutex in mapped file, but don't know how to do that. Could you give some hints are highly appreciated? Thanks in advance! Following is my code snippet, typedef boost::interprocess::interprocess_mutex TMutex; managed_mapped_file *pMapFile = new managed_mapped_file(open_or_create, "/tmp/test.bin",1024UL*64UL*4096UL); TMutex *pMutex = pMapFile->construct<TMutex>("MyMutex")[50](); // Not sure here is right or not? TMutex **? How to declare for mutex array? //If I'd like to refer to 2nd element of this array, how can I use it? //pMutex[2] ? for example, scoped_lock<TMutex> lock; // it crashed Could you give some instruction on how to create mutex array and how to access it by [] or other ways? Thank you very much. -- sincerely, Alan