inner_product

cppreference.com > C++ Algorithms > inner_product

Syntax:

  #include <algorithm>
  TYPE inner_product( iterator start1, iterator end1, iterator start2, TYPE val );
  TYPE inner_product( iterator start1, iterator end1, iterator start2, TYPE val, BinaryFunction f1, BinaryFunction f2 );

The inner_product() function computes the inner product of [start1,end1) and a range of the same size starting at start2.

inner_product() runs in linear time.