Hello,
I've made a futures implementation in the hopes of combining the best features from all the proposals and various implementations currently floating around. It is still rough around the edges, but is mostly covered by unit tests.
http://braddock.com/~braddock/future/
I'm looking for input. I'd be willing to add additional functionality needed and progress it to the point where it could be formally submitted into boost if there is interest. It could perhaps be merged into the existing futures implementation in the vault to add combined groups, etc.
I used Peter's exception_ptr code, which he said he would post under a boost license.
-Braddock Gaskill
I've tested your implementation with a thread and I get sometimes an segmentation fault (linux, gcc-4.1.0). File future_detail.hpp line 79 causes the segmentation fault. Regards, Oliver Code: #include <cstdlib> #include <iostream> #include <stdexcept> #include <string> #include <boost/bind.hpp> #include <boost/function.hpp> #include <boost/thread.hpp> #include "future.hpp" struct X { std::string execute() { return "std::string X::execute()"; } }; void execute( boost::promise< std::string > p, boost::function< std::string() > fn) { p.set( fn() ); } int main( int argc, char *argv[]) { try { X x; boost::function< std::string() > fn( boost::bind( & X::execute, x) ); boost::promise< std::string > p; boost::future< std::string > f( p); boost::thread t( boost::bind( & execute, p, fn) ); std::cout << f.get() << std::endl; t.join(); return EXIT_SUCCESS; } catch ( std::exception const& e) { std::cerr << e.what() << std::endl; } catch ( ... ) { std::cerr << "unhandled exception" << std::endl; } return EXIT_FAILURE; } Gdb: Program terminated with signal 11, Segmentation fault. #0 basic_string (this=0xbff79740, __str=@0x0) at /opt/gcc-4.1.2-src/src/i486-linux-gnu/libstdc++-v3/include/bits/basic_st ring.h:283 283 /opt/gcc-4.1.2-src/src/i486-linux-gnu/libstdc++-v3/include/bits/basic_st ring.h: Datei oder Verzeichnis nicht gefunden. in /opt/gcc-4.1.2-src/src/i486-linux-gnu/libstdc++-v3/include/bits/basic_st ring.h (gdb) bt #0 basic_string (this=0xbff79740, __str=@0x0) at /opt/gcc-4.1.2-src/src/i486-linux-gnu/libstdc++-v3/include/bits/basic_st ring.h:283 #1 0x0804d8da in boost::detail::future_impl::get<std::string> (this=0x8055048, value=0x0) at /home/kowalke/Projects/test_future/src/future_detail.hpp:79 #2 0x0804d94b in boost::future<std::string>::get (this=0xbff796c4) at /home/kowalke/Projects/test_future/src/future.hpp:210 #3 0x0804a007 in main () at /home/kowalke/Projects/test_future/src/test.cpp:43