// fig06_12.cpp
// Compute the product of an array's elements using accumulate.
#include <array>
#include <iostream>
#include <numeric>

template <typename T>
T multiply(T x, T y) {
   return x * y;
}


int multiply_int(int x, int y) {
   return x * y;
}


int main() {
   constexpr std::array integers{1, 2, 3, 4, 5};
   constexpr std::array floats {1.0, 2.0, 3.0, 4.0, 5.0};
   auto multiply_lambda = [](const auto& x, const auto& y) {return x * y; };

   std::cout << "Product of integers: " <<  std::accumulate( std::begin(integers), std::end(integers), 1, multiply<int>) << "\n";

   std::cout << "Product of integers with a lambda: " << std::accumulate(std::begin(integers), std::end(integers), 1, multiply_lambda) << "\n";

   std::cout << "Product of integers with a lambda: " << std::accumulate(std::begin(floats), std::end(floats), 1, multiply_int) << "\n";

   std::cout << "Product of integers with a lambda: " << std::accumulate(std::begin(floats), std::end(floats), 1, multiply_lambda) << "\n";
}


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