C ++ static variable initialization (static pthread_mutex_t initialization)

The static variables defined in the C ++ class must be initialized outside the class, and there is no static variable before. For example:

M. H:

# Include <pthread. h>

Class monitorpthread
{
Public:
Static pthread_mutex_t mut;

Monitorpthread ();
~ Monitorpthread ();


PRIVATE:
........


};

M. cpp:

# Include <iostream>
# Include <unistd. h>
# Include "monitorpthread. H"
# Include "string. H"

Using namespace STD;

// Init mutex
Pthread_mutex_t monitorpthread: mut = pthread_mutex_initializer;

Monitorpthread: monitorpthread ()
{

}

Monitorpthread ::~ Monitorpthread ()
{

}