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  1. #include <iostream>
  2. #include <unordered_set>
  3.  
  4. struct B
  5. {
  6.    int x, y;
  7. };
  8.  
  9. class A
  10. {
  11.    struct hash
  12.    {
  13.       std::size_t operator()( int const a ) const
  14.       {
  15.          return std::hash<int>()( a );
  16.       }
  17.    };
  18.  
  19.    struct equal_to
  20.    {
  21.       std::size_t operator()( int const a, int const b ) const
  22.       {
  23.          return std::equal_to<int>()( a, b );
  24.       }
  25.    };
  26.  
  27.    public:
  28.       std::unordered_set< int, hash, equal_to > set;
  29.       void push( const B& b )
  30.       {
  31.          set.insert( b.x );
  32.       }
  33. };
  34. int main(int argc, char**)
  35. {
  36.     A a;
  37.     a.push({4, 7});
  38.     a.push({15, 7});
  39.     a.push({15, 7});
  40.     a.push({101, 10});
  41.  
  42.     for (auto i: a.set) std::cout << i << "\n";
  43. }
  44.  
Success #stdin #stdout 0s 3032KB
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stdin
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Standard input is empty
stdout
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101
15
4
https://ideone.com/KrykZw
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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