rotate_left()

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

auto kumi::rotate_left ( T && t )

constexpr

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

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 left.

Helper type

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

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

Example

#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_left<1>(values) << "\n";
  std::cout << kumi::rotate_left<3>(values) << "\n";
}

#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_left<1>(values) << "\n";
  std::cout << kumi::rotate_left<3>(values) << "\n";
}