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  1. #include <iostream>
  2. #include <vector>
  3. #include <algorithm>
  4. #include <iterator>
  5.  
  6. class Object
  7. {
  8. public:
  9.     Object() { modify = 0; };
  10.     int modify;
  11. };
  12.  
  13. std::ostream& operator<<(std::ostream& stream, const Object& object)
  14. {
  15.     stream << object.modify;
  16.     return stream;
  17. }
  18.  
  19. struct Functor
  20. { 
  21.     Functor(int new_value)
  22.     { 
  23.         _new_value = new_value;
  24.     }
  25.  
  26.     void operator()(Object& object)
  27.     {
  28.         object.modify = _new_value;
  29.     }
  30.  
  31.     int   _new_value;
  32. };
  33.  
  34. void function_modify(Object& object)
  35. {
  36.     object.modify = 2;
  37. }
  38.  
  39. int main() {
  40.     std::vector<Object> objects(10);
  41.  
  42.     std::cout << "Initial vector" << std::endl;
  43.     std::copy(objects.begin(), objects.end(), std::ostream_iterator<Object>(std::cout, ", "));
  44.     std::cout << std::endl;
  45.  
  46.     std::for_each(objects.begin(), objects.end(), Functor(1));
  47.  
  48.     std::cout << "for_each Functor" << std::endl;
  49.     std::copy(objects.begin(), objects.end(), std::ostream_iterator<Object>(std::cout, ", "));
  50.     std::cout << std::endl;
  51.  
  52.     std::for_each(objects.begin(), objects.end(), function_modify);
  53.  
  54.     std::cout << "for_each function" << std::endl;
  55.     std::copy(objects.begin(), objects.end(), std::ostream_iterator<Object>(std::cout, ", "));
  56.     std::cout << std::endl;
  57.  
  58.     std::for_each(objects.begin(), objects.end(), [](Object& object) { object.modify = 3; } );
  59.  
  60.     std::cout << "for_each lambda" << std::endl;
  61.     std::copy(objects.begin(), objects.end(), std::ostream_iterator<Object>(std::cout, ", "));
  62.     std::cout << std::endl;
  63.  
  64.     for (auto& object: objects) { object.modify = 4; }
  65.  
  66.         std::cout << "for" << std::endl;
  67.     std::copy(objects.begin(), objects.end(), std::ostream_iterator<Object>(std::cout, ", "));
  68.     std::cout << std::endl;
  69.  
  70.     return 0;
  71. }
Success #stdin #stdout 0s 3472KB
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stdin
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Standard input is empty
stdout
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Initial vector
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
for_each Functor
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 
for_each function
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 
for_each lambda
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 
for
4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
https://ideone.com/n1SNnL
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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