none_of() [1/2]

template<concepts::product_type T>

bool kumi::none_of ( T && t )

inlinenodiscardconstexprnoexcept

Checks if no elements of a product type are true.

Parameters

t	Product type to process.

Returns

The evaluation of !none_of(t).

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

Examples:

Tuple:

#include <kumi/kumi.hpp>
#include <iostream>
 
int main()
{
  auto t = kumi::tuple{1,2.,3.f};
  std::cout << std::boolalpha << kumi::none_of( t, [](auto e) { return e > 10.; }) << "\n";
 
  auto u = kumi::tuple{0,0.,0.f};
  std::cout << std::boolalpha << kumi::none_of( u ) << "\n";
}

Record:

#include <kumi/kumi.hpp>
#include <iostream>
 
int main()
{
  using namespace kumi::literals;
  auto t = kumi::record{"a"_id = 1,"b"_id = 2.,"c"_id = 3.f};
  std::cout << std::boolalpha << kumi::none_of( t, [](auto e) { return e > 10.; }) << "\n";
 
  auto u = kumi::record{"a"_id = 0,"b"_id = 0.,"c"_id = 0.f};
  std::cout << std::boolalpha << kumi::none_of( u ) << "\n";
}