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我正在用C++ 11線程構建應用程序,但我似乎無法讓它在MacOSX 10.9上與clang ++一起工作。這是我能找到的是最簡單的例子引起的問題:macosx線程明確標記爲刪除
#include <thread>
#include <iostream>
class Functor {
public:
Functor() = default;
Functor (const Functor&) = delete;
void execute() {
std::cerr << "running in thread\n";
}
};
int main (int argc, char* argv[])
{
Functor functor;
std::thread thread (&Functor::execute, std::ref(functor));
thread.join();
}
這編譯和使用G ++(4.9.2版本)使用下面的命令行上Arch Linux的運行良好:
$ g++ -std=c++11 -Wall -pthread test_thread.cpp -o test_thread
它還會編譯和使用鐺++(版本3.5.0,還對Arch Linux的)運行良好:
$ clang++ -std=c++11 -Wall -pthread test_thread.cpp -o test_thread
但未能MacOSX上10.9.5,使用的XCode 6.1(不管我是否包括-stdlib =的libC++選項):
$ clang++ -std=c++11 -Wall -pthread test_thread.cpp -o test_thread
In file included from test_thread.cpp:1:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/thread:332:5: error: attempt to use a deleted function
__invoke(_VSTD::move(_VSTD::get<0>(__t)), _VSTD::move(_VSTD::get<_Indices>(__t))...);
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/thread:342:5: note: in instantiation of function template specialization
'std::__1::__thread_execute<void (Functor::*)(), std::__1::reference_wrapper<Functor> , 1>' requested here
__thread_execute(*__p, _Index());
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/thread:354:42: note: in instantiation of function template specialization
'std::__1::__thread_proxy<std::__1::tuple<void (Functor::*)(), std::__1::reference_wrapper<Functor> > >' requested here
int __ec = pthread_create(&__t_, 0, &__thread_proxy<_Gp>, __p.get());
^
test_thread.cpp:19:15: note: in instantiation of function template specialization 'std::__1::thread::thread<void (Functor::*)(), std::__1::reference_wrapper<Functor> , void>'
requested here
std::thread thread (&Functor::execute, std::ref(functor));
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/type_traits:1001:5: note: '~__nat' has been explicitly marked deleted
here
~__nat() = delete;
^
1 error generated.
我不知道如何解決這個問題,它似乎是一個編譯器bug。作爲參考,在Mac上的鐺的版本是:
$ clang++ --version
Apple LLVM version 6.0 (clang-600.0.54) (based on LLVM 3.5svn)
Target: x86_64-apple-darwin13.4.0
Thread model: posix
任何想法是什麼我做錯了? 謝謝! 唐納德。
我不確定是你的問題的原因,但標準不需要'std :: thread'構造函數 - 或類似的'std :: async'來解封在這種情況下,'reference_wrapper'是'std :: bind'的方式。嘗試將一個指針傳遞給'Functor'而不是'reference_wrapper'。 (請參見[圖書館活動問題列表DR2219](http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-active.html#2219)。) – Casey 2014-11-24 16:42:36
感謝凱西,似乎確實解決了它 - 至少這個例子編譯和運行沒有任何問題。我將修改其餘的代碼以匹配,看看它是否確實爲整個應用程序解決了問題。 – jdtournier 2014-11-24 16:49:06
@Casey任何機會,你可以張貼您的評論作爲答案,所以我可以接受它...? – jdtournier 2014-11-24 17:18:14