std::thread Error C2893 in VS2015

Question

// C2893.cpp // OK in VS2013, Error in VS2015 // compile with: /EHsc #include <thread> // template <typename T_app> struct instance { void load() {;} }; // template <typename T_app> struct scene { T_app *p_app; void thread_load() { std::thread(&instance<T_app>::load, std::ref(p_app->app_inst) ).detach(); } }; // struct app { instance<app> app_inst; scene<app> app_scene; }; // int main() { app my_app; my_app.app_scene.p_app = &my_app; // OK in VS2013, Error in VS2015 my_app.app_scene.thread_load(); return 0; }

Hello, I just updated to VS2015, the code in VS2013 is OK, how to correct the mistake of thread_load()? I read Breaking Changes in Visual C++ 2015, It must be Non-type template parameters problem, but I can not find a right way. Thanks.

it is equivalent to void load() {} The semicolon is a blank statement (and should be discarded by the compiler). — utnapistim
– utnapistim, Commented Aug 6, 2015 at 8:01
You can try to work around it: std::thread([&]{ p_app->app_inst.load(); }).detach() — melak47
– melak47, Commented Aug 6, 2015 at 9:46

Axel Payan · Accepted Answer · 2015-08-06 10:11:46Z

The error is here std::ref(p_app->app_inst). The second parameter of std::thread should be a instance* in this context but p_app->app_inst is just a instance class.

So the answer is std::thread(&instance<T_app>::load, &p_app->app_inst ).detach(); without any lambda function.

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