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// compile as: g++ -O2 reduce.cc -ltbb
#include <numeric>
#include <vector>
#include <execution>
#include <iostream>
using namespace std;
int main()
{
int ia[] = {1, 2, 3, 4};
vector<int> iv(ia, ia + 4);
// for demonstration purpose: it's unlikely that
cout << // for 4 values parallel execution is used
"Sum: " << reduce(execution::par,
iv.begin(), iv.end(), int()) << "\n"
"Product: " << reduce(iv.begin(), iv.end(), int(1),
multiplies<int>{}) << '\n';
}
// Displays:
// Sum: 10
// Product: 24
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