Standard C++ Library Class Reference

Description

accumulate applies a binary operation to init and each value in the range [first,last). The result

of each operation is returned in init. This process aggregates the result of performing the

operation on every element of the sequence into a single value.

Accumulation is done by initializing the accumulator acc with the initial value init and then

modifying it with acc = acc + *i or acc = binary_op(acc, *i) for every iterator i in the range

[first, last) in order. If the sequence is empty, accumulate returns init.

Complexity

accumulate performs exactly last-first applications of the binary operation (operator+ by

default).

Example

// accum.cpp

#include <numeric> //for accumulate

#include <vector> //for vector

#include <functional> //for times

#include <iostream.h>

int main()

{

//Typedef for vector iterators

typedef vector<int>::iterator iterator;

//Initialize a vector using an array of ints

int d1[10] = {1,2,3,4,5,6,7,8,9,10};

vector<int> v1(d1, d1+10);

//Accumulate sums and products

int sum = accumulate(v1.begin(), v1.end(), 0);

int prod = accumulate(v1.begin(), v1.end(),

1, times<int>());

//Output the results

cout << "For the series: ";