Le 08/04/12 17:18, Jeffrey Lee Hellrung, Jr. a écrit :
On Sun, Apr 8, 2012 at 5:46 AM, Vicente
J. Botet Escriba
<vicente.botet@wanadoo.fr>
wrote:
Le 07/04/12 11:11, John M. Dlugosz a écrit :
On 4/6/2012 11:59 AM, Vicente J. Botet Escriba wrote:
As you are using std::move, &&, ... why not using
directly the C++11 Thread library
provided with the compiler?
1) VS10 has && and std::move, but does not have the
C++11 threading library.
1b) A naive implementation (just starts a new OS thread) is
not wanted.
1c) but, an overly heavy implementation is not wanted
either (i.e VS11 beta), because of additional dependencies
in the program to distribute.
2) In the final code, the && will be optional, to
avoid copies on compilers that support it, but must work
with compilers that don't.
3) I need to preserve semantics of the code I'm replacing
with modern C++ forms.
OK, I see.
BTW, Boost.Thread could not implement async using Boost,
as Boost.Tuple, Boost.Bind
Boost.Fusion (Tuple) because these libraries dont manage
with rvalue references.
I don't understand how that applies to my compiler problem.
It's telling me that
task_object(F const& f_); // << refers
to look here
task_object(F&& f_); //
<<<< Error here
are not a valid overloading set and instead conflict.
Sorry, I misunderstood your message.
After applying the following patch your example compiles.
Please could you try it?
Could you also add a Trac ticket so that this is tracked?
HTH,
Vicente
Vicente,
It looks like you're just removing the
task_object::task_object(F const &) overload. Seems
strange that this overload existed but was/is never actually
suppose to be used. ...except when F is a function pointer, I
guess???
I sent a message to the list recently observing that one
problem was the binding of F to be an lvalue reference
(according to the error message, AFAICS), meaning that "F
const &" and "F&&" are exactly the same type.
Perhaps this behavior should be addressed directly?
After the commit some error have appeared on the regression test
(see below). It seems that the rvalue reference semantic has changed
a lot for gcc. I will try to use the last design for this compiler
version. Then I'll see what needs to be done for other compilers as
soon as results appear on the regression tests page.
Best,
Vicente
Report Time: Mon, 9 Apr 2012 15:38:34 +0000
Compile [2012-04-09 06:09:04
UTC]: fail
"/sierra/Sntools/extras/compilers/gcc-4.3.4/bin/g++" -ftemplate-depth-128 -std=gnu++0x -O0 -fno-inline -Wall -pedantic -g -pthread -fPIC -Wextra -Wno-long-long -pedantic -DBOOST_ALL_NO_LIB=1 -DBOOST_CHRONO_DYN_LINK=1 -DBOOST_SYSTEM_DYN_LINK=1 -DBOOST_SYSTEM_NO_DEPRECATED -DBOOST_THREAD_BUILD_DLL=1 -DBOOST_THREAD_POSIX -DBOOST_THREAD_USE_DLL=1 -I".." -c -o "/scratch/kbelco/boost/results/boost/bin.v2/libs/thread/test/test_4521.test/gcc-4.3.4_0x/debug/threading-multi/test_4521.o" "../libs/thread/test/test_4521.cpp"
../boost/thread/future.hpp: In constructor ???boost::packaged_task<R>::packaged_task(R (*)()) [with R = int]???:
../libs/thread/test/test_4521.cpp:9: instantiated from here
../boost/thread/future.hpp:1830: error: call of overloaded ???task_object(int (*&)())??? is ambiguous
../boost/thread/future.hpp:1705: note: candidates are: boost::detail::task_object<R, F>::task_object(F&&) [with R = int, F = int (*)()]
../boost/thread/future.hpp:1699: note: boost::detail::task_object<R, F>::task_object(R (*)()) [with R = int, F = int (*)()]
../boost/thread/future.hpp:1696: note: boost::detail::task_object<int, int (*)()>::task_object(const boost::detail::task_object<int, int (*)()>&)
Report Time: Mon, 9 Apr 2012 15:38:34 +0000
Compile [2012-04-09 11:24:07
UTC]: fail
"/sierra/Sntools/extras/compilers/gcc-4.4.4/bin/g++" -ftemplate-depth-128 -std=gnu++0x -O0 -fno-inline -Wall -pedantic -g -pthread -fPIC -Wextra -Wno-long-long -pedantic -DBOOST_ALL_NO_LIB=1 -DBOOST_CHRONO_DYN_LINK=1 -DBOOST_SYSTEM_DYN_LINK=1 -DBOOST_SYSTEM_NO_DEPRECATED -DBOOST_TEST_NO_AUTO_LINK=1 -DBOOST_THREAD_BUILD_DLL=1 -DBOOST_THREAD_POSIX -DBOOST_THREAD_USE_DLL=1 -I".." -c -o "/scratch/kbelco/boost/results/boost/bin.v2/libs/thread/test/test_futures.test/gcc-4.4.4_0x/debug/threading-multi/test_futures.o" "../libs/thread/test/test_futures.cpp"
In file included from ../libs/thread/test/test_futures.cpp:10:
../boost/thread/future.hpp: In constructor ???boost::packaged_task<R>::packaged_task(R (*)()) [with R = int]???:
../libs/thread/test/test_futures.cpp:247: instantiated from here
../boost/thread/future.hpp:1830: error: call of overloaded ???task_object(int (*&)())??? is ambiguous
../boost/thread/future.hpp:1705: note: candidates are: boost::detail::task_object<R, F>::task_object(F&&) [with R = int, F = int (*)()]
../boost/thread/future.hpp:1699: note: boost::detail::task_object<R, F>::task_object(R (*)()) [with R = int, F = int (*)()]
../boost/thread/future.hpp:1696: note: boost::detail::task_object<int, int (*)()>::task_object(const boost::detail::task_object<int, int (*)()>&)
../boost/thread/future.hpp: In constructor ???boost::packaged_task<R>::packaged_task(R (*)()) [with R = void]???:
../libs/thread/test/test_futures.cpp:362: instantiated from here
../boost/thread/future.hpp:1830: error: call of overloaded ???task_object(void (*&)())??? is ambiguous
../boost/thread/future.hpp:1759: note: candidates are: boost::detail::task_object<void, F>::task_object(F&&) [with F = void (*)()]
../boost/thread/future.hpp:1753: note: boost::detail::task_object<void, F>::task_object(void (*)()) [with F = void (*)()]
../boost/thread/future.hpp:1696: note: boost::detail::task_object<void, void (*)()>::task_object(const boost::detail::task_object<void, void (*)()>&)
../boost/thread/future.hpp: In constructor ???boost::packaged_task<R>::packaged_task(R (*)()) [with R = int&]???:
../libs/thread/test/test_futures.cpp:382: instantiated from here
../boost/thread/future.hpp:1830: error: call of overloaded ???task_object(int& (*&)())??? is ambiguous
../boost/thread/future.hpp:1705: note: candidates are: boost::detail::task_object<R, F>::task_object(F&&) [with R = int&, F = int& (*)()]
../boost/thread/future.hpp:1699: note: boost::detail::task_object<R, F>::task_object(R (*)()) [with R = int&, F = int& (*)()]
../boost/thread/future.hpp:1696: note: boost::detail::task_object<int&, int& (*)()>::task_object(const boost::detail::task_object<int&, int& (*)()>&)