tests/other/test_concepts.cpp

#include <concepts>
#include <iostream>

template <typename T>
concept Test = std::destructible<T>;

template <Test T>
class MyTest {
public:
    T value;
};

// From template<typename T, typename ... U>
template<typename T, typename ... U>
concept IsAnyOf = (std::same_as<T, U> || ...);

template<typename T>
concept IsPrintable =
  std::integral<T> || std::floating_point<T> ||
  IsAnyOf < std::remove_cvref_t<std::remove_pointer_t<std::decay_t<T>>>,
char, wchar_t > ;

void println(IsPrintable auto const... arguments) {
  (std::wcout << ... << arguments) << '\n';
}

int main() {
  MyTest<int> test;
  println("Example: ", 3.14, " : ", 42, " : [", 'a', L'-', L"Z]");
  return 0;
}