Question

我有一些小cpp source和h source个文件。它使用shared mutexes and shared locks。它在Windows上编译，没有错误，增强1.48.0。它也在linux上编译（之前使用boost 1.47）。但现在有这样的代码：

 boost::shared_mutex mut_;
 //...
 boost::upgrade_lock<boost::shared_mutex> lock(mut_);
 boost::upgrade_to_unique_lock<boost::shared_mutex> uniqueLock(lock);

导致奇怪的错误：

==== Building cf-fs (debug) ====
Creating bin/obj/Debug/cf-fs
fs_concurrent_queued_map.cpp
fs_map.cpp
In file included from ../../src/cf-util/http_utils_inl.h:1,
                 from ../../src/cf-util/http_utils.h:104,
                 from ../../src/cf-fs/fs_map.h:13,
                 from ../../src/cf-fs/fs_map.cpp:1:
../../src/cf-util/http_utils.h:105:8: warning: extra tokens at end of #endif directive
In file included from ../../src/cf-fs/fs_map.h:13,
                 from ../../src/cf-fs/fs_map.cpp:1:
../../src/cf-util/http_utils.h:105:8: warning: extra tokens at end of #endif directive
In file included from ../../../boost_libraries/install-dir/include/boost/thread/pthread/mutex.hpp:12,
                 from ../../../boost_libraries/install-dir/include/boost/thread/mutex.hpp:16,
                 from ../../../boost_libraries/install-dir/include/boost/thread/pthread/thread_data.hpp:12,
                 from ../../../boost_libraries/install-dir/include/boost/thread/thread.hpp:17,
                 from ../../../boost_libraries/install-dir/include/boost/thread.hpp:13,
                 from ../../src/cf-fs/fs_map.h:10,
                 from ../../src/cf-fs/fs_map.cpp:1:
../../../boost_libraries/install-dir/include/boost/thread/locks.hpp: In constructor ‘boost::upgrade_to_unique_lock<Mutex>::upgrade_to_unique_lock(boost::upgrade_lock<Mutex>&) [with Mutex = boost::shared_mutex]’:
../../src/cf-fs/fs_map.cpp:33:   instantiated from here
../../../boost_libraries/install-dir/include/boost/thread/locks.hpp:926: error: call of overloaded ‘move(boost::upgrade_lock<boost::shared_mutex>&)’ is ambiguous
../../../boost_libraries/install-dir/include/boost/thread/detail/move.hpp:44: note: candidates are: typename boost::enable_if<boost::is_convertible<T&, boost::detail::thread_move_t<T> >, boost::detail::thread_move_t<T> >::type boost::move(T&) [with T = boost::upgrade_lock<boost::shared_mutex>]
../../../boost_libraries/install-dir/include/boost/move/move.hpp:294: note:                 typename boost::move_detail::disable_if<boost::has_move_emulation_enabled<T>, T&>::type boost::move(T&) [with T = boost::upgrade_lock<boost::shared_mutex>]
../../../boost_libraries/install-dir/include/boost/thread/locks.hpp: In destructor ‘boost::upgrade_to_unique_lock<Mutex>::~upgrade_to_unique_lock() [with Mutex = boost::shared_mutex]’:
../../src/cf-fs/fs_map.cpp:33:   instantiated from here
../../../boost_libraries/install-dir/include/boost/thread/locks.hpp:932: error: call of overloaded ‘move(boost::unique_lock<boost::shared_mutex>&)’ is ambiguous
../../../boost_libraries/install-dir/include/boost/thread/detail/move.hpp:44: note: candidates are: typename boost::enable_if<boost::is_convertible<T&, boost::detail::thread_move_t<T> >, boost::detail::thread_move_t<T> >::type boost::move(T&) [with T = boost::unique_lock<boost::shared_mutex>]
../../../boost_libraries/install-dir/include/boost/move/move.hpp:294: note:                 typename boost::move_detail::disable_if<boost::has_move_emulation_enabled<T>, T&>::type boost::move(T&) [with T = boost::unique_lock<boost::shared_mutex>]
make[1]: *** [bin/obj/Debug/cf-fs/fs_map.o] Ошибка 1
make: *** [cf-fs] Ошибка 2

我的代码中是否有错误，无法编译以及如何解决或绕过它？

Answer 1

--- a/locks.hpp 2011-12-05 12:26:11.650309054 +0400
+++ b/locks.hpp 2011-12-05 12:27:25.905311415 +0400
@@ -923,13 +923,13 @@
         upgrade_to_unique_lock& operator=(upgrade_to_unique_lock&);
     public:
         explicit upgrade_to_unique_lock(upgrade_lock<Mutex>& m_):
-            source(&m_),exclusive(move(*source))
+            source(&m_),exclusive(move(detail::thread_move_t<upgrade_lock<Mutex> >(*source)))
         {}
         ~upgrade_to_unique_lock()
         {
             if(source)
             {
-                *source=move(exclusive);
+                *source=move(detail::thread_move_t<unique_lock<Mutex> >(exclusive));
             }
         }

在Linux上提升1.48.0 upgrade_to_unique_lock：自1.47以来有什么变化或者我做错了什么？

1 个答案: