Re: [boost] Re: Boost.Threads Locking Delima (William E. Kempf)

From: Peter Dimov (pdimov_at_[hidden])
Date: 2002-05-18 03:46:55

From: "Eric D Crahen" <crahen_at_[hidden]>
[...]

> template <class T, class LockType>
> class GuardedObject : private NonCopyable {
> 
>   T* _object;
>   LockType _lock;
> 
>   friend class Proxy;
>   class Proxy : public Guard<T> {

Noncopyable, since a scoped lock (Guard<T>) is noncopyable.

> 
>     T* _ptr;
> 
>     Proxy(T* ptr, LockType& lock) : Guard<T>(lock), _ptr(ptr) {}
> 
>     T* operator->() {
>       return _ptr;
>     }
> 
>   }
> 
> public:
> 
>   GuardedObject(T* object) : _object(object) {}
>   ~GuardedObject() { delete _object; }
> 
>   Proxy operator->() {

Doesn't compile. Need a copy constructor to return by value.

>     return Proxy(_object, _lock);
>   }