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#include <iostream>
#include <future>
#include <iomanip>
using namespace std;
//code
int m1[2][2] = {{1, 2}, {3, 4}};
int m2[2][2] = {{3, 4}, {5, 6}};
void innerProduct(promise<int> &ref, int row, int col)
{
int sum = 0;
for (int idx = 0; idx != 2; ++idx)
sum += m1[row][idx] * m2[idx][col];
ref.set_value(sum);
}
int main()
{
promise<int> result[2][2];
for (int row = 0; row != 2; ++row)
{
for (int col = 0; col != 2; ++col)
thread(innerProduct, ref(result[row][col]), row, col).detach();
}
for (int row = 0; row != 2; ++row)
{
for (int col = 0; col != 2; ++col)
cout << setw(3) << result[row][col].get_future().get();
cout << '\n';
}
}
//=
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