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  1.     #define INVOKE(hof, func, arg) \
  2.        hof([](const decltype(arg)& arg_){return func(arg_);}, arg);
  3.  
  4.     // This function mimics the signature of QtCollector::run for testing
  5.     template <typename Functor, typename Arg1>
  6.     auto QtConcurrent_run(Functor functor, const Arg1 &arg1)
  7.           -> decltype(functor(arg1))
  8.     {
  9.           return functor(arg1);
  10.     }
  11.  
  12.     #include <iostream>
  13.  
  14.     int f(int x) { std::cout << "int" << " " << x << std::endl; return x; }
  15.     double f(double x) { std::cout << "double" << " " << x << std::endl; return x; }
  16.  
  17.     int main() {
  18.       INVOKE(QtConcurrent_run, f, 3);
  19.       INVOKE(QtConcurrent_run, f, 3.14);
  20.       INVOKE(QtConcurrent_run, f, '3');
  21.       return 0;
  22.     }
  23.  
Success #stdin #stdout 0s 2884KB
comments (?)
stdin 
Standard input is empty
stdout 
int 3
double 3.14
int 51
https://ideone.com/CTSPJW
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
public

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