ClassVersion.h

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#ifndef FIRE_IO_CLASSVERSION_H
#define FIRE_IO_CLASSVERSION_H
 
namespace fire::io {
 
namespace class_version_impl {
 
template<class T, class R = void>
struct enable_if_type { using type = R; };
 
template<class T, class Enable = void>
struct deducer {
  using version = std::integral_constant<int,0>;
};
 
template<class T>
struct deducer<T, typename enable_if_type<typename T::version>::type> {
  using version = typename T::version;
};
 
} // namespace class_version_impl
 
template <typename T>
inline constexpr int class_version = class_version_impl::deducer<T>::version::value;
 
}
 
#define fire_class_version(VERS) using version = std::integral_constant<int,VERS>
 
#endif  // FIRE_IO_CLASSVERSION_H