Never mind my previous message... I found the solution after pressing the send button. Sorry. Luc. Luc Bergeron wrote:
Hello everyone,
i'm currently trying to implement a thread safe singleton using template. In the class I need to use a boost::mutex in order to protect access to the singleton pointer. The problem i'm currently encountering is that I need to initialize this static boost::mutex, but how !?!?!?!
I tried using a pointer to a mutex and initialize it to null but that didn't work. I also tried to new it in the initialization but that failed too. :(
Can someone help me on this one ???
Thanks in advance for any help.
Luc.
P.S. I'm using boost 1.29 :)
P.S.S Here is my current class definition : (A link to where I got this implementation : http://www.drizzle.com/~scottb/publish/gpgems1_singleton.htm) http://www.drizzle.com/%7Escottb/publish/gpgems1_singleton.htm%29
template <typename T> class ThreadSafeSingleton { static T* d_ThreadSafeSingleton; static boost::mutex d_mutex;
public: ThreadSafeSingleton() { assert(!d_ThreadSafeSingleton); int offset = (int)(T*)1 - (int)(ThreadSafeSingleton <T>*)(T*)1; d_ThreadSafeSingleton = (T*)((int)this + offset); } ~ThreadSafeSingleton() { assert(d_ThreadSafeSingleton); d_ThreadSafeSingleton = 0; }
static T& GetSingleton(void) { boost::mutex::scoped_lock scoped_lock(d_mutex); assert(d_ThreadSafeSingleton); return *d_ThreadSafeSingleton; }
static T* GetSingletonPtr(void) { boost::mutex::scoped_lock scoped_lock(d_mutex); return d_ThreadSafeSingleton; } };
template <typename T> T* ThreadSafeSingleton <T>::d_ThreadSafeSingleton = 0;
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