Re: destruction of already destructed pointer variable when copying an object - abort error

Kindly consider the code segment below: I have a function
object containing a pointer variable which is passed to
min_element algorithm. My problem is the pointer variable is
deleted twice and I do not know how to fix this issue.

class FO{
public:
set<int>::size_type size(){return s->size()}
bool operator()(int a, int b);
~FO();

private:
set<int> * s;
};

FO::FO(){
s = new set<int>;
}

FO::~FO(){
delete s;
}

bool FO::operator()(int a,int b){
s->insert(a);
return (a<b);
}

int main(){
vector<int> v;
//vector populated
FO fo;
min_element(v.begin(),v.end(),fo);
}

The variable 's' is defined as a pointer bcz min_element
algorithm takes a copy of its function object argument. Now
inside the min_element algorithm, the copy of 'fo' is
deleted which results in freeing of the memory associated
with 's'. But in the main, the original object fo is
destructed and then also the same memory is freed and this
gives a abort error.

How to solve this kind of a problem?