Материал из C\C++ эксперт
Using the generic accumulate algorithm to compute a product by using a function object
#include <iostream>
#include <vector>
#include <cassert>
#include <numeric> // For accumulate
using namespace std;
class multiply {
public:
int operator()(int x, int y) const { return x * y; }
};
int main()
{
int x[5] = {2, 3, 5, 7, 11};
vector<int> vector1(&x[0], &x[5]);
int product = accumulate(vector1.begin(), vector1.end(),
1, multiply());
cout << product << endl;
return 0;
}2310
Using the generic accumulate algorithm to compute a product by using multiplies
#include <iostream>
#include <vector>
#include <cassert>
#include <numeric> // For accumulate
#include <functional> // For multiplies
using namespace std;
int main()
{
int x[5] = {2, 3, 5, 7, 11};
vector<int> vector1(&x[0], &x[5]);
int product = accumulate(vector1.begin(), vector1.end(),1, multiplies<int>());
cout << product << endl;
return 0;
}2310
