#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
double pow_of_two();
int main()
{
vector<double> v(5);
generate(v.begin(), v.end(), pow_of_two);
for(unsigned i=0; i < v.size(); ++i)
cout << v[i] << endl;
return 0;
}
// A generator function that generates the powers of 2.
double pow_of_two() {
static double val = 1.0;
double t;
t = val;
val += val;
return t;
}
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