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  1. #include <vector>
  2. #include <unordered_set>
  3. #include <functional>
  4.  
  5. struct Point
  6. {
  7.     float x;
  8.     float y;
  9.     Point() : x(0), y(0) {}
  10. };
  11.  
  12. int main()
  13. {
  14.     auto hash=[](const Point& pt){
  15.         return (size_t)(pt.x*100 + pt.y);
  16.     };
  17.     auto hashFunc=[&hash](){
  18.         return  std::function<size_t(const Point&)> (hash);
  19.     };
  20.     auto equal=[](const Point& pt1, const Point& pt2){
  21.         return ((pt1.x == pt2.x) && (pt1.y == pt2.y));
  22.     };
  23.     auto equalFunc=[&equal](){
  24.         return std::function<size_t(const Point&,const Point&)> (equal);
  25.     };
  26.     using PointHash=std::unordered_set<Point,decltype(hashFunc),decltype(equalFunc)>;
  27. //equalKey()(Point(),Point());//ok
  28.     PointHash Test(10,hashFunc,equalFunc);
  29.  
  30.     return 0;
  31. }
  32.  
Success #stdin #stdout 0s 3424KB
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https://ideone.com/LEixBc
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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