[C++] accumulate/reduce

개요

• 범위의 요소들에 특정 연산을 수행

예제

• 코드

   #include <execution>
   #include <iostream>
   #include <numeric>
   #include <vector>
      
   using namespace std;
      
   int main() {
   	vector<int> values{1, 2, 3, 4, 5};
      
   	cout << accumulate(values.cbegin(), values.cend(), 0) << endl;
   	cout << accumulate(values.cbegin(), values.cend(), 1, multiplies<int>())
   		 << endl;
      
   	cout << "------" << endl;
      
   	cout << reduce(execution::par_unseq, values.cbegin(), values.cend())
   		 << endl;
   	cout << reduce(execution::par_unseq, values.cbegin(), values.cend(), 1,
   				   multiplies<int>())
   		 << endl;
      
   	return 0;
   }
  

• 실행 결과

   15
   120
   ------
   15
   120