count

count_t kumi::count {}

inlineconstexprnoexcept

Callable object counting the number of elements of t not equivalent to false.

On a record type, the function operates on the underlying elements of the fields.

Header file

#include <kumi/algorithm/predicates.hpp>

Call Signature

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

Parameters

• t: Product Type to process

Return value

• Number of elements not equivalent to false.

Examples

Tuple

#include <kumi/kumi.hpp>
#include <iostream>
#include <type_traits>
 
int main()
{
  auto t = kumi::tuple{1, 0, 2., nullptr, 3.f, false, 'z'};
  std::cout << std::boolalpha << kumi::count(t ) << "\n";
}

Record

#include <kumi/kumi.hpp>
#include <iostream>
#include <type_traits>
 
int main()
{
  using namespace kumi::literals;
  auto t = kumi::record{"a"_id = 1, "b"_id = 0, "c"_id = 2., "d"_id = nullptr
                      , "e"_id = 3.f, "f"_id = false, "g"_id = 'z'};
  std::cout << std::boolalpha << kumi::count(t ) << "\n";
}