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    #include <vector>
 
    template <class T, class F>
    class Bheap
    {
    public:
        Bheap(int allocateSize) {}
        void insert(T value, F f)
        {
        	f(value,value);
        }
        void getMax();
    private:
        int sizeUsed;
        int allocateSize;
        std::vector<T> myBheap;
    };
 
    struct SomeStruct
    {
    	void operator()(int){}
    };
 
    int main()
    {
    	Bheap<int, SomeStruct> b(10);
    	SomeStruct s;
    	b.insert(10, s);
    }
 

prog.cpp: In instantiation of 'void Bheap<T, F>::insert(T, F) [with T = int; F = SomeStruct]':
prog.cpp:28:20:   required from here
prog.cpp:10:23: error: no match for call to '(SomeStruct) (int&, int&)'
          f(value,value);
                       ^
prog.cpp:19:12: note: candidate is:
     struct SomeStruct
            ^
prog.cpp:21:11: note: void SomeStruct::operator()(int)
      void operator()(int){}
           ^
prog.cpp:21:11: note:   candidate expects 1 argument, 2 provided

Standard output is empty