rotate_right()

template<std::size_t R, concepts::product_type T>

auto kumi::rotate_right ( T && t )

constexpr

Rotates the element of a product type R positions to the right, wrapping around when getting to the end.

On record types, this function operates on elements as if they were ordered. The considered order is the order of declaration.

Template Parameters

R	Rotation factor

Parameters

t	Product type to rotate.

Returns

A product type equivalent to t with elements rotated R positions to the right.

Helper type

namespace kumi::result
{
  template<std::size_t R, product_type T> struct rotate_right;
 
  template<std::size_t R, product_type T>
  using rotate_right_t = typename rotate_right<R, T>::type;
}

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

Examples:

Tuple:

#include <kumi/kumi.hpp>
#include <iostream>
 
int main()
{
  auto values = kumi::tuple {'A','B','C','D','E','F'};
 
  std::cout << values << "\n";
  std::cout << kumi::rotate_right<1>(values) << "\n";
  std::cout << kumi::rotate_right<3>(values) << "\n";
}

Record:

#include <kumi/kumi.hpp>
#include <iostream>
 
int main()
{
  using namespace kumi::literals;
  auto values = kumi::record{"a"_id=1,"b"_id=2,"c"_id=3,"d"_id=4,"e"_id=5,"f"_id=6};
 
  std::cout << values << "\n";
  std::cout << kumi::rotate_right<1>(values) << "\n";
  std::cout << kumi::rotate_right<3>(values) << "\n";
}