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  1. #include <iostream>
  2. #include <vector>
  3. #include <future>
  4.  
  5. class A {
  6. public:
  7.   A(int value) : value_(value) {}
  8.  
  9.   // Copy constructor
  10.   A(const A& other) : value_(other.value_) {
  11.     std::cout << "Copy constructor called\n"; 
  12.   }
  13.  
  14.   // Move constructor
  15.   A(A&& other) noexcept : value_(other.value_) {
  16.     other.value_ = 0; // Reset the moved-from object
  17.     std::cout << "Move constructor called\n";
  18.   }
  19.  
  20.   int value() const { return value_; }
  21.  
  22. private:
  23.   int value_;
  24. };
  25.  
  26. void process(const A& obj) {
  27.   // Simulate some work
  28.   std::this_thread::sleep_for(std::chrono::milliseconds(100));
  29.   std::cout << "Processing object with value: " << obj.value() << std::endl;
  30. }
  31.  
  32. int main() {
  33.   std::vector<A> objects;
  34.   objects.push_back(A(1));
  35.   objects.push_back(A(2));
  36.   objects.push_back(A(3));
  37.  
  38.   std::vector<std::future<void>> futures;
  39.  
  40.   std::cout << "Start processing\n";
  41.   for (const auto& obj : objects) {
  42.     // Capture 'obj' by reference in the lambda
  43.     futures.push_back(std::async(std::launch::async, 
  44.                                  [&obj]() { process(obj); })); 
  45.   }
  46.  
  47.   // Wait for all threads to finish
  48.   for (auto& f : futures) {
  49.     f.get();
  50.   }
  51.  
  52.   return 0;
  53. }
Success #stdin #stdout 0.01s 5284KB
comments (?)
stdin
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Standard input is empty
stdout
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Move constructor called
Move constructor called
Move constructor called
Move constructor called
Move constructor called
Move constructor called
Start processing
Processing object with value: 3
Processing object with value: 2
Processing object with value: 1
https://ideone.com/GpQ9Ov
language:
C++14 (gcc 8.3)
created:
20 days ago
visibility:
public

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