C++ Thread level constants

Question

Is there a way by which we can simulate thread level constants in C++? For example, if i have to make a call to template functions, then i need to mention the constants as template level parameters? I can use static const variables for template metaprogramming, but they are process level constants.

I know, i am asking a question with a high probability of 'No'. Just thought of asking this to capitalize on the very rare probability :))

On request, i am posting a sample code. Here i needed to track the enquiry, if it comes from one specific thread. I assume that, if i create that as my first thread, then it will get the thread id 1.

template<ACE_INT32 ThreadId>
bool enquire_presence( Manager* man)
{
      return check(man);
}


template<>
bool enquire_presence<1>( Manager* man )
{
      track_enquiry(man);
      return check(man);
}

Thanks, Gokul.

Answer 1

Check out Boost's Thread Local Storage.

However, I'm not sure this will give you the template metaprogramming capability you want. You may have to explicitly define a constant value for each thread you expect to create.

Answer 2

Templates are compile time constructs, threads are run-time ones - there is no way of having templates specific to a thread.