[Boost-bugs] [Boost C++ Libraries] #10340: No boost::promise<T>::set_value(const T&) overload present in C++03 mode

Subject: [Boost-bugs] [Boost C++ Libraries] #10340: No boost::promise<T>::set_value(const T&) overload present in C++03 mode
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2014-08-11 11:25:03

#10340: No boost::promise<T>::set_value(const T&) overload present in C++03 mode
------------------------------+----------------------
 Reporter:  rob.desbois@…     |      Owner:  anthonyw
     Type:  Bugs              |     Status:  new
Milestone:  To Be Determined  |  Component:  thread
  Version:  Boost 1.54.0      |   Severity:  Problem
 Keywords:                    |
------------------------------+----------------------
 When compiling in C++03 mode I am unable to use anything but a primitive
 type in a promise, and therefore also the dependent types in Boost.Thread

 Minimal testcase:
     #include <boost/thread/future.hpp>

     struct foo
     {
         foo(int i_): i(i_) {}
         int i;
     };

     int main()
     {
         // Clearly a const future ref isn't much use, but I needed to
         // prove the problem wasn't me trying to copy a unique_future
         const boost::unique_future<foo>& fut =
 boost::make_ready_future( foo(42) );
     }


 Output from g++ 4.8.2 with Boost 1.55 and -DBOOST_THREAD_USES_MOVE:
     In file included from
 ../../deps/boost/include/boost/tuple/tuple.hpp:33:0,
                      from
 ../../deps/boost/include/boost/thread/detail/async_func.hpp:37,
                      from
 ../../deps/boost/include/boost/thread/future.hpp:22,
                      from t.cpp:2:
     ../../deps/boost/include/boost/tuple/detail/tuple_basic.hpp: In
 function ‘typename boost::tuples::access_traits<typename
 boost::tuples::element<N, boost::tuples::cons<HT, TT> >::type>::const_type
 boost::tuples::get(const boost::tuples::cons<HT, TT>&)’:
     ../../deps/boost/include/boost/tuple/detail/tuple_basic.hpp:228:45:
 warning: typedef ‘cons_element’ locally defined but not used [-Wunused-
 local-typedefs]
        typedef BOOST_DEDUCED_TYPENAME impl::type cons_element;
                                                  ^
     In file included from
 ../../deps/boost/include/boost/bind/bind.hpp:29:0,
                      from ../../deps/boost/include/boost/bind.hpp:22,
                      from
 ../../deps/boost/include/boost/thread/future.hpp:41,
                      from t.cpp:2:
     ../../deps/boost/include/boost/bind/arg.hpp: In constructor
 ‘boost::arg<I>::arg(const T&)’:
     ../../deps/boost/include/boost/bind/arg.hpp:37:22: warning: typedef
 ‘T_must_be_placeholder’ locally defined but not used [-Wunused-local-
 typedefs]
              typedef char T_must_be_placeholder[ I ==
 is_placeholder<T>::value? 1: -1 ];
                           ^
     t.cpp: In function ‘int main()’:
     t.cpp:12:78: error: expected primary-expression before ‘f’
              const boost::unique_future<foo>& fut =
 boost::make_ready_future( foo f(42) );
 ^
     t.cpp:12:42: warning: unused variable ‘fut’ [-Wunused-variable]
              const boost::unique_future<foo>& fut =
 boost::make_ready_future( foo f(42) );
                                               ^
     In file included from
 ../../deps/boost/include/boost/system/system_error.hpp:14:0,
                      from
 ../../deps/boost/include/boost/thread/exceptions.hpp:22,
                      from
 ../../deps/boost/include/boost/thread/pthread/mutex.hpp:12,
                      from
 ../../deps/boost/include/boost/thread/mutex.hpp:16,
                      from
 ../../deps/boost/include/boost/thread/future.hpp:24,
                      from t.cpp:2:
     ../../deps/boost/include/boost/system/error_code.hpp: At global scope:
     ../../deps/boost/include/boost/system/error_code.hpp:222:36: warning:
 ‘boost::system::posix_category’ defined but not used [-Wunused-variable]
          static const error_category &  posix_category =
 generic_category();
                                         ^
     ../../deps/boost/include/boost/system/error_code.hpp:223:36: warning:
 ‘boost::system::errno_ecat’ defined but not used [-Wunused-variable]
          static const error_category &  errno_ecat     =
 generic_category();
                                         ^
     ../../deps/boost/include/boost/system/error_code.hpp:224:36: warning:
 ‘boost::system::native_ecat’ defined but not used [-Wunused-variable]
          static const error_category &  native_ecat    =
 system_category();


 I have replicated this with Clang 3.4, also with Boost 1.54 on both
 compilers, and without -DBOOST_THREAD_USES_MOVE too.
 From the boost-users mailing list it looks like it has been replicated
 with 1.56 too.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/10340>
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