Mega Code Archive
Use valarray + valarray to double the value for each element in valarray
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#include <iostream>
#include <valarray>
#include <cmath>
using namespace std;
int main()
{
valarray<int> v(10);
for(int i=0; i<10; i++)
v[i] = i;
cout << "Original contents: ";
for(int i=0; i<10; i++)
cout << v[i] << " \n\n";
v = v + v;
for(int i=0; i<10; i++)
cout << v[i] << " \n\n";
cout << endl;
}
/*
Original contents: 0
1
2
3
4
5
6
7
8
9
0
2
4
6
8
10
12
14
16
18
*/
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