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POConstructing a std::thread with a function
 

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  1. POConstructing a std::thread with a function
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    <p>This works:</p> <pre><code> std::thread t = std::thread(printf, "%d", 1); </code></pre> <p>This doesn't work:</p> <pre><code>t2 = std::thread(my_thread_func , std::ref(context)); </code></pre> <p>OR</p> <pre><code>std::thread t1 = std::thread(my_thread_func , context_add); </code></pre> <p>my_thread_func definition : </p> <pre><code>int my_thread_func(long long *context_add) </code></pre> <p>context is some struct .. and I'm trying to do 'pass by reference'</p> <p>Error:</p> <pre><code>function call missing argument list; error C2661: 'std::thread::thread' : no overloaded function takes 2 arguments </code></pre> <p><em>>>> EDIT &lt;&lt;&lt;</em></p> <p>Sorry for confusion ... actually I'm defining my_thread_func in public of MainPage, so I cannot use native type hence I thought worth trying for long and give it address.</p> <pre><code>/* test data types, context for thread function, in .cpp (not in namespace) */ typedef struct _test_context { HANDLE hHandle; unsigned int flag; }test_context_t; test_context_t *context; //Do something with its member context_add = (long long *)context; std::thread t2 = std::thread(sem_waiting_thread, context_add); </code></pre> <p>ERROR:</p> <pre><code>error C3867: 'App1::MainPage::my_thread_func': function call missing argument list; use '&amp;App1::MainPage::my_thread_func' to create a pointer to member error C2661: 'std::thread::thread' : no overloaded function takes 2 arguments </code></pre> <p>my namespace looks like:</p> <pre><code>namespace App1 { public ref class MainPage sealed { public: MainPage(); public: MainPage(); int my_thread_func(long long cotext); .. }; } </code></pre> <p><em>&lt;&lt;&lt;&lt; EDIT 2 >>></em> I'm curious now .. this simple one also doesn't work!</p> <pre><code>void f1(int n) { for(int i=0; i&lt;5; ++i) { // Print n std::this_thread::sleep_for(std::chrono::milliseconds(10)); } } . . . int n=0; std::thread t2(f1, n+1); (//This didn't work,same error!) . . . but this worked! std::thread t2; . . . t2= std::thread (f1, n+1); </code></pre> <p>Trying from here: <a href="http://en.cppreference.com/w/cpp/thread/thread/thread" rel="nofollow">http://en.cppreference.com/w/cpp/thread/thread/thread</a></p>
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    1. UScode muncher
    1. UScode muncher
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    1. COThe question is a bit confusing... *context is some struct*, but in the declaration it is a pointer to a `long long`... can you post the actual declaration of the function and the type that you want to pass in?
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      1. USDavid Rodríguez - dribeas
    2. COYou should show a complete example that, with the not-working std::thread constructor line commented out, compiles. Then someone can show you how to write that line properly. Otherwise, we have to guess. That being said, I think betabandido did manage to answer successfully in this case—but most of us aren't as psychic as him.
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      1. USabarnert
    3. COWhat do you mean by "I cannot use native type"? Why are you casting the `context` to a `long long`?
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      1. USbetabandido
 

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