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  1. #include <algorithm>    // for std::remove_if()
  2. #include <iostream>     // for std::cout, std::endl
  3. #include <string>       // for std::string
  4. #include <vector>       // for std::vector
  5. using namespace std;
  6.  
  7. void print(const char* name, const vector<string>& v);
  8.  
  9. int main() 
  10. {
  11.     // Input vectors
  12.     vector<string> a = {"the", "of"};
  13.     vector<string> b = {"oranges", "the", "of", "apples"};
  14.  
  15.     print("a", a);
  16.     print("b", b);
  17.  
  18.     // Use the erase-remove idiom
  19.     a.erase(
  20.         remove_if(
  21.             a.begin(), 
  22.             a.end(), 
  23.  
  24.             // This lambda returns true if current string 's'
  25.             // (from vector 'a') is in vector 'b'. 
  26.             [&b](const string& s) 
  27.             {
  28.                 auto it = find(b.begin(), b.end(), s);
  29.                 return (it != b.end());
  30.             }
  31.         ), 
  32.  
  33.         a.end()
  34.     );
  35.  
  36.     cout << "\nAfter removing:\n";
  37.     print("a", a);
  38. }
  39.  
  40.  
  41. void print(const char* name, const vector<string>& v) 
  42. {
  43.     cout << name << " = {";
  44.     bool first = true;
  45.     for (const auto& s : v) 
  46.     {
  47.         if (first) 
  48.         {
  49.             first = false;
  50.             cout << s;
  51.         } 
  52.         else 
  53.         {
  54.             cout << ", " << s;
  55.         }
  56.     }
  57.     cout << "}" << endl;
  58. }
  59.  
Success #stdin #stdout 0s 3476KB
comments (?)
stdin
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Standard input is empty
stdout
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a = {the, of}
b = {oranges, the, of, apples}

After removing:
a = {}
https://ideone.com/kWMqYP
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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