pthreads - PTHREAD_MUTEX_INITIALIZER inside C++ member function cannot compile?

Question

class A {
    public:
        A();
    private:
        pthread_mutex_t mu;
};

A::A()
{
    mu = PTHREAD_MUTEX_INITIALIZER;  //cannot compile
}

Can't I initialize pthread_mutex_t inside a class member function?

Answer 1

Instead of this:

A::A()
{
    mu = PTHREAD_MUTEX_INITIALIZER;  //cannot compile
}

Try this:

A::A()
{
pthread_mutex_init( &(mu), NULL);
}

The PTHREAD_MUTEX_INITIALIZER is a macro,a C struct initializer for something like {0,0,0,0,0{0}} and can only be used at the point of definition.