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  1. #include <set>
  2. #include <iostream>
  3.  
  4. int main()
  5. {
  6.     std::set<int> c = {1, 2, 3, 4, 1, 2, 3, 4};
  7.  
  8.     auto print = [&c]
  9.     {
  10.         std::cout << "c = { ";
  11.         for (int n : c)
  12.             std::cout << n << ' ';
  13.         std::cout << "}\n";
  14.     };
  15.     print();
  16.  
  17.     std::cout << "Erase all odd numbers:\n";
  18.     for (auto it = c.cbegin(); it != c.cend();)
  19.     {
  20.         if (*it % 2 != 0)
  21.             it = c.erase(it);
  22.         else
  23.             ++it;
  24.     }
  25.     print();
  26.  
  27.     std::cout << "Erase 1, erased count: " << c.erase(1) << '\n';
  28.     std::cout << "Erase 2, erased count: " << c.erase(2) << '\n';
  29.     std::cout << "Erase 2, erased count: " << c.erase(2) << '\n';
  30.     print();
  31. }
Success #stdin #stdout 0.01s 5316KB
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stdin
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Standard input is empty
stdout
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c = { 1 2 3 4 }
Erase all odd numbers:
c = { 2 4 }
Erase 1, erased count: 0
Erase 2, erased count: 1
Erase 2, erased count: 0
c = { 4 }
https://ideone.com/QWUS8D
language:
C++14 (gcc 8.3)
created:
14 hours ago
visibility:
public

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