struct char_in_set
{
   char_in_set(std::set<char> && chars):
       m_chars(std::move(chars))
   {}
   
   template<typename I, typename S>
   std::pair<bool, I> operator()(I b, S) const
   {
       return { m_chars.contains(*b), ++b};
   }
private:
   std::set<char> m_chars;
};

auto print = [](auto const& view) {
   for (std::cout << "{ "; const auto element : view)
       std::cout << element << ' ';
   std::cout << "} ";
};

int main()
{
   constexpr std::string_view hello { "Some string,to tokenize.last." };
   std::cout << "\n" "substrings 1: ";

   ranges::for_each(
       hello
       | ranges::views::split_when(char_in_set({' ', ',', '.'}))
       , print);
}

constexpr float f(float x) { return x * 0x1.8p0f + 0x1p-25f; }

int main() {
 constexpr float a = 0x1.000006p0f;

 volatile float b = a;
 b = f(b);

 constexpr float c = f(a);

 std::cout << std::hexfloat << b << '\n' << c << std::endl;
}

auto print = [](auto const& view) {
   for (std::cout << "{ "; const auto element : view)
       std::cout << element << ' ';
   std::cout << "} ";
};

int main()
{
   constexpr std::string_view hello { "Some string,to tokenize.last" };
   std::cout << "\n" "substrings 1: ";
   std::ranges::for_each(
       hello | std::ranges::views::split(' ')
             | std::ranges::views::transform([](auto w){
                   return w | std::ranges::views::split(',');
             }) | std::ranges::views::join, print);

   /*
   std::cout << "\n" "substrings 2: ";
   std::ranges::for_each(
       hello | std::ranges::views::split(' ')
             | std::ranges::views::transform([](auto w){
                   return w | std::ranges::views::split(',');
             }) | std::ranges::views::join
             | std::ranges::views::transform([](auto w){
                   return w | std::ranges::views::split('.');
             }) | std::ranges::views::join, print);
   // */
}