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  1. #include <deque>
  2. #include <vector>
  3. #include <iostream>
  4.  
  5. struct checkpoint {
  6.     checkpoint() {std::cout << "default construct\n";}
  7.     checkpoint(const checkpoint& rhs) {std::cout << "copy construct\n";}
  8.     checkpoint&operator=(const checkpoint& rhs) {std::cout << "copy assign\n"; return *this;}
  9. };
  10.  
  11. void push(std::deque<std::vector<checkpoint> >&cont, std::vector<checkpoint>& indata) {
  12.     cont.push_back(std::vector<checkpoint>());
  13.     cont.back().swap(indata);
  14. }
  15. void pop(std::deque<std::vector<checkpoint> >&cont, std::vector<checkpoint>& outdata) {
  16.     cont.front().swap(outdata);
  17.     cont.pop_front();
  18. }
  19.  
  20. int main() {
  21.     std::deque<std::vector<checkpoint> > cont;
  22.     std::vector<checkpoint> largedata(1);
  23.     std::cout << "checkpoint\n";
  24.     push(cont, largedata);
  25.     std::cout << "checkpoint\n";
  26.     pop(cont, largedata);
  27.     std::cout << "checkpoint\n";
  28.     return 0;
  29.  
  30.  
  31. }
Success #stdin #stdout 0.01s 2860KB
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stdin
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Standard input is empty
stdout
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default construct
copy construct
checkpoint
checkpoint
checkpoint
https://ideone.com/w1yjSo
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
secret

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