> "std::accumulate" : 
    * Örnek 1,
        #include <vector>
        #include <numeric>
        #include <iostream>
        #include <string>
        #include <execution>

        int main()
        {
            using namespace std;

            vector<int> ivec{ 1, 3, 5, 7, 9 };
            
            cout << accumulate(
                ivec.begin(), 
                ivec.end(), 
                0
            ) << '\n'; // 25 
            
            
            cout << accumulate(
                ivec.begin(), 
                ivec.end(), 
                0, 
                [](int prev_result, int val) { return prev_result + val; }
            ) << '\n'; // 25
            
            
            cout << accumulate(
                ivec.begin(), 
                ivec.end(), 
                ""s, 
                [](string prev_result, int val) { return prev_result + '-' + to_string(val); }
            ) << '\n'; // -1-3-5-7-9
            
            
            /*  // ERROR
                cout << reduce(
                    execution::par, 
                    ivec.begin(), ivec.end(), 
                    "0"s, 
                    [](string prev_result, int val) { return prev_result + to_string(val); }
                ) << '\n';
            */
        }