prod() [2/2]

template<product_type T, typename Value >

constexpr auto kumi::prod ( T &&  t, Value  init  )

inlineconstexpr

Computes the product of all elements.

Parameters

t	Product type to operate on
init	Initial value of the product

Returns

The value of get<0>(t) * ... * get<N-1>(t) * init

Helper type

namespace kumi::result
{
  template<product_type T, typename Value> struct prod;
 
  template<product_type T, typename Value>
  using prod_t = typename prod<T,Value>::type;
}

Computes the return type of a call to kumi::prod

Example

 
#include <kumi/kumi.hpp>
#include <iostream>
 
int main()
{
  auto t = kumi::tuple{2.,5,short{3},'\4'};
 
  std::cout << kumi::prod(t, 10) << "\n";
  std::cout << kumi::prod(t) << "\n";
}