From: Bronek Kozicki (brok_at_[hidden])
Date: 2004-07-22 16:21:17
Eric Niebler wrote:
> get a pointer to the mutex from the scoped_lock. You should get back a
> token or a void* that is useful only for comparison purposes.
It just came to my mind that if we decide to add common base class, such
void* could be returned there. Thus it would look something like:
class lock
{
bool* active_;
void* mutex_;
protected:
~lock() {} // no-op
lock(bool* active, void* mutex) : active_(active), mutex_(mutex)
{assert(active_ != NULL); assert(mutex_ != NULL);}
lock(const lock& src) : active_(src.active_)
{assert(src.mutex_ == mutex_);}
public:
bool active() const {return *active_;}
void* mutex() const {return mutex_;}
// or just polymorphic functions:
// virtual bool active() const = 0;
// virtual void* mutex() const = 0;
operator safe_bool() const {return active() ? safe_true : safe_false;}
};
Actually "mutex" can be renamed here to "handle" or "primitive" ...
B.