underlying_value.hpp

Go to the documentation of this file.

#pragma once
 
/// @file userver/utils/underlying_value.hpp
/// @brief @copybrief utils::UnderlyingValue
/// @ingroup userver_universal
 
#include <type_traits>
 
USERVER_NAMESPACE_BEGIN
 
namespace utils {
 
/// @brief Function that extracts integral value from enum or StrongTypedef
template <class T>
constexpr auto UnderlyingValue(T v) noexcept {
  static_assert(std::is_enum<T>::value,
                "UnderlyingValue works only with enums or StrongTypedef");
 
  return static_cast<std::underlying_type_t<T>>(v);
}
 
}  // namespace utils
 
USERVER_NAMESPACE_END