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  1. #include <algorithm>    // for std::find(), std::remove_if()
  2. #include <array>        // for std::array
  3. #include <iostream>     // for console output
  4. #include <vector>       // for std::vector
  5.  
  6. typedef std::array<int, 3> Point3D;
  7.  
  8. std::ostream& operator<<(std::ostream& os, const Point3D& point)
  9. {
  10.     os << "{" << point[0] << ", " 
  11.        << point[1] << ", " << point[2] << "}";
  12.  
  13.     return os;
  14. }
  15.  
  16. std::ostream& operator<<(std::ostream& os, const std::vector<Point3D>& v) 
  17. {
  18.     if (v.empty())
  19.     {
  20.         os << "{ <empty> }" << std::endl;
  21.         return os;
  22.     }
  23.  
  24.     os << "{\n";
  25.     for (const auto& point : v)
  26.     {
  27.         os << "  " << point << '\n';
  28.     }
  29.     os << "}" << std::endl;
  30.     return os;
  31. }
  32.  
  33. int main()
  34. {
  35.     std::vector<Point3D> objPoints{{1, 2, 3}, 
  36.                                    {4, 5, 6}, 
  37.                                    {11, 22, 33}, 
  38.                                    {44, 55, 66}, 
  39.                                    {77, 88, 99}};
  40.  
  41.     std::vector<Point3D> delPoints{{10, 10, 10}, 
  42.                                    {11, 22, 33}, 
  43.                                    {44, 55, 66}};
  44.  
  45.  
  46.     std::cout << "objPoints =\n" << objPoints << std::endl;
  47.     std::cout << "delPoints =\n" << delPoints << std::endl;
  48.  
  49.     objPoints.erase(
  50.         std::remove_if(
  51.             objPoints.begin(), 
  52.             objPoints.end(), 
  53.             [&delPoints](const Point3D& point)
  54.             { 
  55.                 // Erasing condition:
  56.                 // Is 'point' contained in the 'delPoints' vector?
  57.                 auto it = std::find(delPoints.begin(), delPoints.end(), point);
  58.                 return (it != delPoints.end());
  59.             }), 
  60.         objPoints.end());
  61.  
  62.     std::cout << "\nAfter erasing, objPoints =\n";
  63.     std::cout << objPoints << std::endl;
  64. }
  65.  
Success #stdin #stdout 0s 3476KB
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stdin
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Standard input is empty
stdout
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objPoints =
{
  {1, 2, 3}
  {4, 5, 6}
  {11, 22, 33}
  {44, 55, 66}
  {77, 88, 99}
}

delPoints =
{
  {10, 10, 10}
  {11, 22, 33}
  {44, 55, 66}
}


After erasing, objPoints =
{
  {1, 2, 3}
  {4, 5, 6}
  {77, 88, 99}
}
https://ideone.com/L1NnhA
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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