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Question

I'm building an application with C++11 threads, but I can't seem to get it to work with clang++ on MacOSX 10.9. Here is the simplest example I can find that causes the issues: ``` #include #include class Functor { public: Functor() = default; Functor (const Functor& ) = delete; void execute () { std::cerr << "running in thread "; } }; int main (int argc, char* argv[]) { Functor functor; std::thread thread (&Functor::execute, std::ref(functor)); thread.join(); } ``` This compiles and runs fine on Arch Linux using g++ (version 4.9.2) with the following command-line: ``` $ g++ -std=c++11 -Wall -pthread test_thread.cpp -o test_thread ``` It also compiles and runs fine using clang++ (version 3.5.0, also on Arch Linux): ``` $ clang++ -std=c++11 -Wall -pthread test_thread.cpp -o test_thread ``` But fails on MacOSX 10.9.5, using XCode 6.1 (regardless of whether I include the -stdlib=libc++ option): ``` $ clang++ -std=c++11 -Wall -pthread test_thread.cpp -o test_thread In…

Accepted Answer

The standard does not require the `std::thread` constructor - or the similar `std::async` for that matter - to unwrap a `reference_wrapper` when passed as the first argument with a pointer-to-member-function the way `std::bind` does. Pass a pointer to `Functor` instead of a `reference_wrapper`. (See Library Active Issues list DR2219.)

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