text: /* Copyright 2021 R. Thomas
   * Copyright 2021 Quarkslab
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  #ifndef LIEF_ENUMS_H_
  #define LIEF_ENUMS_H_
  #include <type_traits>
  
  #define _LIEF_EN(N) class N : size_t
  #define _LIEF_EN_2(N, TYPE) class N : TYPE
  #define _LIEF_EI(X) X
  
  #define ENABLE_BITMASK_OPERATORS(X)  \
  template<>                           \
  struct EnableBitMaskOperators<X>     \
  {                                    \
    static const bool bit_mask_enabled = true;   \
  };
  
  template<typename Enum>
  struct EnableBitMaskOperators
  {
    static const bool bit_mask_enabled = false;
  };
  
  template<typename Enum>
  typename std::enable_if<EnableBitMaskOperators<Enum>::bit_mask_enabled, Enum>::type
  operator |(Enum lhs, Enum rhs)
  {
      using underlying = typename std::underlying_type<Enum>::type;
      return static_cast<Enum> (
          static_cast<underlying>(lhs) |
          static_cast<underlying>(rhs)
      );
  }
  
  template<typename Enum>
  typename std::enable_if<EnableBitMaskOperators<Enum>::bit_mask_enabled, Enum>::type
  operator &(Enum lhs, Enum rhs)
  {
      using underlying = typename std::underlying_type<Enum>::type;
      return static_cast<Enum> (
          static_cast<underlying>(lhs) &
          static_cast<underlying>(rhs)
      );
  }
  
  template<typename Enum>
  typename std::enable_if<EnableBitMaskOperators<Enum>::bit_mask_enabled, Enum>::type
  operator ~(Enum e)
  {
      using underlying = typename std::underlying_type<Enum>::type;
      return static_cast<Enum>(~static_cast<underlying>(e));
  }
  
  template<typename Enum>
  typename std::enable_if<EnableBitMaskOperators<Enum>::bit_mask_enabled, typename std::add_lvalue_reference<Enum>::type>::type
  operator |=(Enum& lhs, Enum rhs)
  {
      using underlying = typename std::underlying_type<Enum>::type;
      lhs = static_cast<Enum>(static_cast<underlying>(lhs) | static_cast<underlying>(rhs));
      return lhs;
  }
  
  template<typename Enum>
  typename std::enable_if<EnableBitMaskOperators<Enum>::bit_mask_enabled, typename std::add_lvalue_reference<Enum>::type>::type
  operator &=(Enum& lhs, Enum rhs)
  {
      using underlying = typename std::underlying_type<Enum>::type;
      lhs = static_cast<Enum>(static_cast<underlying>(lhs) & static_cast<underlying>(rhs));
      return lhs;
  }
  
  template<typename Enum>
  typename std::enable_if<EnableBitMaskOperators<Enum>::bit_mask_enabled, bool>::type
  is_true(Enum e)
  {
    using underlying = typename std::underlying_type<Enum>::type;
    return static_cast<underlying>(e) > 0;
  }
  #endif
  