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#include <iostream>
#include <vector>
using namespace std;
 
 
 
 
class Rectangle{
    public:
    Rectangle(double w, double h);
    double area() const {
        return width*height;
    }
    private:
    bool operator >(const Rectangle& other);
    double width, height;
};
 
 
 
Rectangle::Rectangle(double w, double h)
    :width(w),height(h)
{}
 
bool Rectangle::operator >(const Rectangle& other){
 
    return this->area()>other->area();
}
 
 
void bubble_sort(vector<Rectangle>& vec){
        bool swapped = true;
 
        for (int i=0;(i<vec.size()-1)&& swapped; i++){
            swapped = false;
 
            for(int j = i; j<vec.size()-1;j++){
 
                if(vec[j]>vec[j+1]){
                    Rectangle temp = vec[j];
                    vec[j] = vec[j+1];
                    vec[j+1] = temp;
                    swapped = true;
                }
            }
        }
    }
 
    int main(){
        vector<Rectangle>v;
 
        while(cin){
            double w,h;
 
            cin>>w>>h;
            v.push({w,h});
        }
 
        bubble_sort(v);
        for(int i=0; i<v.size();i++) 
        cout<< v[i].area()<<' ';
        cout<< '\n';
    }
        }
    }

prog.cpp: In member function ‘bool Rectangle::operator>(const Rectangle&)’:
prog.cpp:27:30: error: base operand of ‘->’ has non-pointer type ‘const Rectangle’
     return this->area()>other->area();
                              ^~
prog.cpp: In function ‘void bubble_sort(std::vector<Rectangle>&)’:
prog.cpp:39:34: error: ‘bool Rectangle::operator>(const Rectangle&)’ is private within this context
                 if(vec[j]>vec[j+1]){
                                  ^
prog.cpp:25:6: note: declared private here
 bool Rectangle::operator >(const Rectangle& other){
      ^~~~~~~~~
prog.cpp: In function ‘int main()’:
prog.cpp:56:15: error: ‘class std::vector<Rectangle>’ has no member named ‘push’
             v.push({w,h});
               ^~~~
prog.cpp: At global scope:
prog.cpp:64:9: error: expected declaration before ‘}’ token
         }
         ^

Standard output is empty