CbmTypeTraits.h

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/* Copyright (C) 2025 GSI Helmholtzzentrum fuer Schwerionenforschung, Darmstadt
   SPDX-License-Identifier: GPL-3.0-only
   Authors: Sergei Zharko [committer] */

 
#pragma once
 
#include <optional>
#include <type_traits>
 
namespace cbm::util
{
  template<auto What, auto... Sequence>
  struct is_in_sequence {
    static constexpr bool value{((What == Sequence) || ...)};
  };
 
  template<auto... Args>
  constexpr bool is_in_sequence_v = is_in_sequence<Args...>::value;
 

  template<typename...>
  struct is_all_same : std::false_type {
  };
 
  template<>
  struct is_all_same<> : std::true_type {
  };
 
  template<typename T>
  struct is_all_same<T> : std::true_type {
  };
 
  template<typename T>
  struct is_all_same<T, T> : std::true_type {
  };
 
  template<typename T, typename... Args>
  struct is_all_same<T, T, Args...> : is_all_same<T, Args...> {
  };
 

  template<auto... Values>
  constexpr bool have_same_type_v = is_all_same<decltype(Values)...>::value;
 
 
  // TODO: re-use in CbmYaml.h, bring other type traits from CbmYamlBaseTypes.h here
  template<typename>
  struct is_std_optional : std::false_type {
  };
 
  template<typename T>
  struct is_std_optional<std::optional<T>> : std::true_type {
  };
 
  template<typename T>
  constexpr bool is_std_optional_v = is_std_optional<T>::value;
 

  template<typename T, class Class>
  struct is_pointer_to : std::false_type {
  };
 
  template<class Class>
  struct is_pointer_to<const Class*, Class> : std::true_type {
  };
 
  template<class Class>
  struct is_pointer_to<Class*, Class> : std::true_type {
  };
 
  template<typename T, class Class>
  constexpr bool is_pointer_to_v = is_pointer_to<T, Class>::value;
 
 
}  // namespace cbm::util