#include <iostream>
#include <functional>
#include <memory>
#include <vector>
using namespace std;
 
template<typename R>
R f(bool x)
{
	return x ? R() : R();
}
 
template<typename R>
struct X
{
	X(const function<R()>& xfn) : fn(xfn) {}
	R get(bool f)
	{
		return f ? fn() : R();
	}
	function<R()> fn;
};
 
int intf() { return 0; }
void voidf() {}
 
void delme(int*) {
	cout<<"delme"<<endl;
}
 
int main() {
	int k = 0;
	vector<shared_ptr<int>> v;
	v.emplace_back(new int(1));
	v.emplace_back(&k, &delme);
 
	cout<<"============="<<endl;
 
	shared_ptr<int> p = v.back();
	v.pop_back();
	return 0;
}

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