On Apr 24, 2009, at 11:47 AM, Hipatia wrote:
Hi!
I'm trying to get the id number of a thread just to write it to the standard output.
Since I'm not an expert in c++ programming, let me explain what I do (even if it's quite simple): a create an instance as follows, boost::thread::id thread_id= boost::this_thread::get_id(); By debugging my code with Visual Studio, I see that 'thread_id' has an 'unsigned int' object member called 'id', so I would like to display this value. Unfortunately, I cannot find in the boost documentation any function member of boost::thread::id class that returns its value.
The id class defined operator<<, so just do this: std::cout << "Thread id is: " << boost::this_thread::get_id(); I just did a replacement of a pthread implementation with a boost thread implementation, and I needed to get the numeric value of the data member, which I did like this (Thread::id_t is a typedef for uint64_t): Thread::id_t getId() { std::stringstream ios; // This needs to be a pointer because on a *nix system, this_thread::get_id() // returns an object that defines operator<< to write the pthread_t to the stream, // and it's a pointer, so it gets formatted as hex and we can't change that by // inserting a dec manipulator. So when we read out of the stream, we need to // read into something for which a hex format makes sense. Stupid. Just stupid. void *numericId; ios << this_thread::get_id(); ios >> numericId; // And, of course, static_cast can't be used to convert from void* to the integer type. return (Thread::id_t)numericId; } It's a hack, I know, but I couldn't think of anything else. - Rush