pop_front

pop_front_t kumi::pop_front {}

inlineconstexprnodiscard

Callable object removing the first (if any) element of t.

Callable object removing the last(if any) element of t.

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

Header file

#include <kumi/algorithm/push_pop.hpp>

Call Signature

template<product_type T>
constexpr auto pop_front(T && t);

Parameters

• t: Base product type

Return value

• A product type composed of all elements of t except its first. Has no effect on empty product types.

Helper type

    template<kumi::concepts::product_type T> struct pop_front
    {
      using type = decltype(kumi::pop_front(std::declval<T>()));
    };
 
    template<kumi::concepts::product_type T> using pop_front_t = typename kumi::result::pop_front<T>::type;
 

Computes the return type of a call to kumi:pop_front

Examples

Tuple

#include <kumi/kumi.hpp>
#include <iostream>
 
int main()
{
  std::cout << kumi::pop_front( kumi::tuple{} )  << "\n";
 
  kumi::tuple t{1,2.,3.4f};
  std::cout << t                    << "\n";
  std::cout << kumi::pop_front(t)   << "\n";
}

Record

#include <kumi/kumi.hpp>
#include <iostream>
 
int main()
{
  using namespace kumi::literals;
  std::cout << kumi::pop_front( kumi::record{} )  << "\n";
 
  kumi::record r{"a"_id = 1,"b"_id = 2.,"c"_id = 3.4f};
  std::cout << r                    << "\n";
  std::cout << kumi::pop_front(r)   << "\n";
}

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

Header file

#include <kumi/algorithm/push_pop.hpp>

Call Signature

template<product_type T, typename V>
constexpr auto pop_back(T && t, V && v);

Parameters

• t: Base product type

Return value

A product type composed of all elements of `t` except its last. Has no effect on empty product types.

Helper type

    template<kumi::concepts::product_type T> struct pop_back
    {
      using type = decltype(kumi::pop_back(std::declval<T>()));
    };
 
    template<kumi::concepts::product_type T> using pop_back_t = typename kumi::result::pop_back<T>::type;

Computes the return type of a call to kumi:pop_back

Examples

Tuple

#include <kumi/kumi.hpp>
#include <iostream>
 
int main()
{
  std::cout << kumi::pop_back( kumi::tuple{} )  << "\n";
 
  kumi::tuple t{1,2.,3.4f};
  std::cout << t                    << "\n";
  std::cout << kumi::pop_back(t)   << "\n";
}

Record

#include <kumi/kumi.hpp>
#include <iostream>
 
int main()
{
  using namespace kumi::literals;
  std::cout << kumi::pop_back( kumi::record{} )  << "\n";
 
  kumi::record r{"a"_id = 1,"b"_id = 2.,"c"_id = 3.4f};
  std::cout << r                    << "\n";
  std::cout << kumi::pop_back(r)   << "\n";
}