#include <iostream>
#include <cmath>
#include <type_traits>
using namespace std;
 
class Dummy{
private:
    double content;
public:
    Dummy(double _content) :content{ _content } {};
    operator long int() { return (long int)content; };
};
 
int main(){
    Dummy a = Dummy(1.1);
    double aa = fabs(static_cast<double>(a));
 
    double (*fabs_ptr)(double) = fabs;
    fabs_ptr(a);
 
    using fabs_ptr2 = double (*)(double);
    static_cast<fabs_ptr2>(fabs)(a);
 
    return 0;
}

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