primitive.hpp

#ifndef LIBSBX_UTILITY_PRIMITIVE_HPP_
#define LIBSBX_UTILITY_PRIMITIVE_HPP_
 
#include <concepts>
#include <type_traits>
 
#include <fmt/format.h>
 
#include <libsbx/utility/string_literal.hpp>
 
namespace sbx::utility {
 
template<typename Type, string_literal Unit>
requires (std::is_arithmetic_v<Type>)
class primitive {
 
public:
 
  using value_type = Type;
 
  inline static constexpr auto unit = Unit;
 
  constexpr explicit primitive(Type value = static_cast<value_type>(0)) noexcept
  : _value{value} { }
 
  constexpr ~primitive() = default;
 
  constexpr operator Type() const noexcept {
    return _value;
  }
 
private:
 
  Type _value;
 
}; // class primitive
 
} // namespace sbx::utility
 
template<typename Type, sbx::utility::string_literal Unit>
struct fmt::formatter<sbx::utility::primitive<Type, Unit>> {
 
  template<typename ParseContext>
  constexpr auto parse(ParseContext& context) -> decltype(context.begin()) {
    return context.begin();
  }
 
  template<typename FormatContext>
  auto format(const sbx::utility::primitive<Type, Unit>& value, FormatContext& context) -> decltype(context.out()) {
    return fmt::format_to(context.out(), "{}{}", static_cast<Type>(value), Unit);
  }
 
}; // struct fmt::formatter<sbx::utility::primitive<Type>>
 
#endif // LIBSBX_UTILITY_PRIMITIVE_HPP_