Algorithm to accumulate a range. std::accumulate is defined in numeric.h. Use accumulate_if if you need to supply a predicate.

With std::accumulate, for example, you could sum up the values of a std::vector like the example below:


#include <cassert>

#include <vector>

#include <numeric>

 

int main()

{

  //Create a std::vector

  std::vector<int> v;

  for (int i=0; i!=10; ++i) { v.push_back(i); }

 

  //Sum the std::vector

  const int sum = std::accumulate(v.begin(), v.end(), 0 ); // '0' is the initial value

 

  //Assume std::accumulate works correctly

  assert(sum == 45);

}

A definition of std::accumulate


template <class InputIterator, class T>

T accumulate (InputIterator first, InputIterator last, T init)

{

  while (first != last) init = init + *first++;

  return init;

}

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(C++) std::accumulate

A definition of std::accumulate