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  1. #include <future>
  2. #include <functional>
  3. #include <type_traits>
  4. #include <iostream>
  5.  
  6. void foo()
  7. {
  8.     std::cout<<"Hello, world!"<<std::endl;
  9. }
  10.  
  11. template<typename T> struct adv { 
  12.   T t; 
  13.   explicit adv(T &&t):t(std::forward<T>(t)) {} 
  14.   template<typename ...U> T &&operator()(U &&...) { 
  15.     return std::forward<T>(t); 
  16.   } 
  17. }; 
  18.  
  19. template<typename T> adv<T> make_adv(T &&t) { 
  20.   return adv<T>{std::forward<T>(t)}; 
  21. }
  22.  
  23. namespace std { 
  24.   template<typename T> 
  25.   struct is_bind_expression< adv<T> > : std::true_type {}; 
  26. } 
  27.  
  28. int main()
  29. {
  30.      typedef decltype(&foo) foo_type;
  31.      typedef std::result_of<foo_type()>::type foo_rettype;
  32.  
  33.      auto chosen_async=
  34.        static_cast<std::future<foo_rettype> (*)(foo_type && )>(&std::async<foo_type>);
  35.  
  36.      auto async_bound=
  37.          std::bind<std::future<foo_rettype>>(chosen_async, 
  38.                                              make_adv(std::forward<foo_type>(&foo)));
  39.  
  40.      async_bound().wait();
  41.      async_bound().wait();
  42. }
Success #stdin #stdout 0s 3032KB
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stdin
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Standard input is empty
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Hello, world!
Hello, world!
https://ideone.com/gapLs
language:
C++14 (gcc 8.3)
created:
13 years ago
visibility:
public

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