just use boost::bind, like this boost::thread my_thread( boost::bind( &testing, this ) ); Also, you haven't defined the member function testing. Christian On 9/27/06, Monica Gretzer <mogr_progr@yahoo.se> wrote:

Hi,

I want to use boost::thread to create threads that are member functions within a class. In all the examples I have seen, the thread function is defined globally.

I explain it with code. The following test code works:

// code 1: example program that works ----------------------------------------------- #include <boost/thread/thread.hpp> #include <iostream> using namespace std;

void testing() { cout << "I'm a thread." << endl; }

int main(int argc, char* argv[]) { // start a new thread that calls the "testing" function boost::thread my_thread(&testing); // wait for the thread to finish my_thread.join();

return 0; }

// -------------------------------------------------------------------------------------------

Now, I want to create something like:

// code 2: thread created from member class (code yields compiler errors)

#include <boost/thread/thread.hpp> #include <iostream> using namespace std;

class TestThread { public: void testing(void); void CreateThread(void); };

void TestThread::CreateThread() { // start a new thread that calls the "testing" function boost::thread my_thread(&testing); // wait for the thread to finish my_thread.join(); }

int main(int argc, char* argv[]) { TestThread t; t.CreateThread();

return 0; }

When compiling the code above (code 2), I get the following compilation error: ISO C++ forbids taking the address of an unqualified or paranthesized non-static member function to form a pointer to member function. Say &TestThread::testing.

My question is: How do I create threads from within a C++ class member function?

Thanks a lot for your help.

/ Mogr _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

You need a global wrapper function. Ie, a thread start function that takes the address of the instance of the class as the void* pointer and then runs some method in the class. (Generally a run method or something similar) something like: void* start_thread( void* data ) { TestThread* tt = dynamic_cast<TestThread*>( data ) tt->run() ; } Paul On 9/27/06, Monica Gretzer <mogr_progr@yahoo.se> wrote:

Hi,

I want to use boost::thread to create threads that are member functions within a class. In all the examples I have seen, the thread function is defined globally.

I explain it with code. The following test code works:

// code 1: example program that works ----------------------------------------------- #include <boost/thread/thread.hpp> #include <iostream> using namespace std;

void testing() { cout << "I'm a thread." << endl; }

int main(int argc, char* argv[]) { // start a new thread that calls the "testing" function boost::thread my_thread(&testing); // wait for the thread to finish my_thread.join();

return 0; }

// -------------------------------------------------------------------------------------------

Now, I want to create something like:

// code 2: thread created from member class (code yields compiler errors)

#include <boost/thread/thread.hpp> #include <iostream> using namespace std;

class TestThread { public: void testing(void); void CreateThread(void); };

void TestThread::CreateThread() { // start a new thread that calls the "testing" function boost::thread my_thread(&testing); // wait for the thread to finish my_thread.join(); }

int main(int argc, char* argv[]) { TestThread t; t.CreateThread();

return 0; }

When compiling the code above (code 2), I get the following compilation error: ISO C++ forbids taking the address of an unqualified or paranthesized non-static member function to form a pointer to member function. Say &TestThread::testing.

My question is: How do I create threads from within a C++ class member function?

Thanks a lot for your help.

/ Mogr

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