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Enum helpers
The enum helpers are include as part of meta_reader.h and they exist in the xlang::meta::reader namespace.
These methods assist in defining and operating on enumerations defined by the Xlang metadata file format.
template <typename T>
struct coded_index_bits : std::integral_constant<uint32_t, N> {};
template <typename T>
inline constexpr uint32_t coded_index_bits_v = coded_index_bits<T>::value;
The xlang::meta::reader::coded_index_bits traits type defines the number of bits consumed to encode a particular value in the metadata file format.
The xlang::meta::reader::coded_index_bits_v constant expression simplifies the extraction of the value from the coded_index_bits.
template <typename T>
constexpr inline T enum_mask(T value, T mask) noexcept;
The xlang::meta::reader::enum_mask function combines a value with a mask via bitwise logical AND, and it returns the result as the same enumerated type.
template <typename Index, typename Row>
struct index_tag;
template <typename Index, typename Row>
inline constexpr auto index_tag_v = index_tag<Index, Row>::value;
The xlang::meta::reader::index_tag traits type defines the value of a particular enumerated type. It is used for template programming purposes. For example, index_tag<HasContent, Field>::value is the value HasContent::Field.
The xlang::meta::reader::index_tag_v constant expression simplifies the extraction of the value from the index_tag.