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  1. // Example program
  2. #include <iostream>
  3. #include <string>
  4. #include <vector>
  5. #include <chrono>
  6. using namespace std;
  7.  
  8. int main()
  9. {
  10.     string a = "veryveryveryveryveryveryveryveryveryveryveryveryveryveryveryveryveryveryveryveryveryveryveryveryveryveryveryverylongstring";
  11.     vector<string> b(10,a);
  12.     vector<vector<string> > c(1000,b);
  13.     vector<string> d,e;
  14.  
  15.     auto t1 = chrono::system_clock::now();
  16.     for(auto& item : c)
  17.     {
  18.         d.insert(d.end(),item.begin(),item.end());
  19.     }
  20.     cout << c[0][0].length() << endl;
  21.  
  22.     auto t2 = chrono::system_clock::now();
  23.     for(auto& item:c)
  24.     {
  25.         e.insert(e.end(), std::make_move_iterator(item.begin()),std::make_move_iterator(item.end()));
  26.     }
  27.  
  28.     auto t3 = chrono::system_clock::now();    
  29.     cout << chrono::duration_cast<chrono::nanoseconds>(t2-t1).count() << endl;
  30.     cout << chrono::duration_cast<chrono::nanoseconds>(t3-t2).count() << endl;
  31.     cout << c[0][0].length() << endl;
  32.     cout << "To check that c has been moved from." <<endl;
  33. }
Success #stdin #stdout 0s 3336KB
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stdin
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Standard input is empty
stdout
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122
320576
98434
0
To check that c has been moved from.
https://ideone.com/3LCJXF
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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