boost::gil::inner_product_k

template<
    std::size_t Size,
    class InputIterator1,
    class InputIterator2,
    class T,
    class BinaryOperation1,
    class BinaryOperation2>
[[__always_inline__]]
T
inner_product_k(
    InputIterator1 first1,
    InputIterator2 first2,
    T init,
    BinaryOperation1 binary_op1,
    BinaryOperation2 binary_op2);