filter_not()

template<template< typename > typename Pred, concepts::product_type T>

constexpr auto kumi::filter_not ( T &&  t )

inlineconstexprnoexcept

Filters a product type over a predicate.

Template Parameters

Pred	Compile-time predicate

Parameters

t	Product type to process

Returns

A product type containing all values which types does not satisfy Pred.

Helper type

namespace kumi
{
  template<template<typename> typename Pred, kumi::product_type T> struct filter_not;
 
  template<template<typename> typename Pred, kumi::product_type T>
  using filter_not_t = typename filter_not<Pred, T>::type;
}

Computes the type returned by a call to kumi::filter_not.

Example:

 
#include <kumi/kumi.hpp>
#include <type_traits>
#include <iostream>
 
int main()
{
  int     a = 4;
  double  b = 3.1415;
  float   c = 0.01f;
 
  auto original = kumi::tuple{a,&a,b,&b,c,&c,'z',nullptr};
  std::cout << original << "\n";
 
  std::cout << "Non Pointers : "  << kumi::filter_not<std::is_pointer>(original) << "\n";
  std::cout << "Non Reals     : " << kumi::filter_not<std::is_floating_point>(original) << "\n";
  std::cout << "Non nullptr  : "  << kumi::filter_not<std::is_null_pointer>(original) << "\n";
}

 
#include <kumi/kumi.hpp>
#include <type_traits>
#include <iostream>
 
int main()
{
  int     a = 4;
  double  b = 3.1415;
  float   c = 0.01f;
 
  auto original = kumi::tuple{a,&a,b,&b,c,&c,'z',nullptr};
  std::cout << original << "\n";
 
  std::cout << "Non Pointers : "  << kumi::filter_not<std::is_pointer>(original) << "\n";
  std::cout << "Non Reals     : " << kumi::filter_not<std::is_floating_point>(original) << "\n";
  std::cout << "Non nullptr  : "  << kumi::filter_not<std::is_null_pointer>(original) << "\n";
}