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Inner product

T inner_product (InputIterator1 first1, InputIterator1 last1, InputIterator2 first2, T init) Function
T inner_product (InputIterator1 first1, InputIterator1 last1, InputIterator2 first2, T init, BinaryOperation1 binary_op1, BinaryOperation2 binary_op2) Function 

template 
T inner_product(InputIterator1 first1, InputIterator1 last1,
                InputIterator2 first2, T init);

template 
T inner_product(InputIterator1 first1, InputIterator1 last1,
                InputIterator2 first2, T init,
                BinaryOperation1 binary_op1, BinaryOperation2 binary_op2);

inner_product computes its result by initializing the accumulator acc with the initial value init and then modifying it with acc = acc + (*i1) * (*i2) or acc = binary_op1(acc, binary_op2(*i1, *i2)) for every iterator i1 in the range [first, last) and iterator i2 in the range [first2, first2 + (last - first)) in order. binary_op1 and binary_op2 are assumed not to cause side effects.