Re: [Boost-users] [thread] getting thread id number

              |-> id This last parameter (an unsigned integer) is the one that I want to retrieve.

By the way, in Visual Studio there is a thread watch window in which I can see the current existing threads and their associated ID numbers. Thus, both the id shown in this window and the one shown in the thread::id properties are the same.

This is implementation detail that boost.thread doesn't expose. But as already proposed, you can make std::map that maps thread_id objects to windows-specific thread-id, like this: std::map ids; ids[myThread.get_id()] = GetThreadID(myThread.native_handle());