sum() [2/2]

template<product_type Tuple, typename Value >

constexpr auto kumi::sum ( Tuple &&  t, Value  init  )

constexpr

Computes the sum of all elements.

Parameters

t	Tuple to operate on.
init	Optional initial value of the sum.

Returns

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

Helper type

namespace kumi::result
{
  template<product_type Tuple, typename Value> struct sum;
 
  template<product_type Tuple, typename Value>
  using sum_t = typename sum_t<Tuple,Value>::type;
}

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

Example

 
#include <kumi/tuple.hpp>
#include <iostream>
 
int main()
{
  auto t = kumi::tuple{2.,1,short{55},' '};
 
  std::cout << kumi::sum(t, 100) << "\n";
  std::cout << kumi::sum(t) << "\n";
}