charclass.hpp File Reference

256-bit byte set with O(1) membership, fully constexpr. More...

#include "real/version.hpp"
#include <array>
#include <cstddef>
#include <cstdint>

Include dependency graph for charclass.hpp:

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Classes
struct	real::detail::char_class
	A set of byte values (0–255) as a 256-bit bitmap. More...

Namespaces
namespace	real
namespace	real::detail

Functions
constexpr void	real::detail::fold_ascii_case (char_class &klass)
	Closes klass under ASCII case folding.
constexpr bool	real::detail::is_ascii_word_byte (std::uint8_t byte)
	Reports whether byte is an ASCII "word" byte ([0-9A-Za-z_]).
constexpr char_class	real::detail::digit_set ()
	The ASCII digit set behind \d (Python re.ASCII semantics).
constexpr char_class	real::detail::word_set ()
	The ASCII word set behind \w.
constexpr char_class	real::detail::space_set ()
	The ASCII whitespace set behind \s.
constexpr char_class	real::detail::utf8_cont_set ()
	The UTF-8 continuation-byte set 10xxxxxx.
constexpr char_class	real::detail::utf8_lead2_set ()
	The lead-byte set of a 2-byte UTF-8 sequence.
constexpr char_class	real::detail::utf8_lead3_set ()
	The lead-byte set of a 3-byte UTF-8 sequence.
constexpr char_class	real::detail::utf8_lead4_set ()
	The lead-byte set of a 4-byte UTF-8 sequence.

Detailed Description

256-bit byte set with O(1) membership, fully constexpr.

The engine only ever tests bitmaps: negation and "one whole codepoint" semantics are resolved at compile time (see compiler.hpp), never at match time. Also provides the ASCII sets behind \d, \w and \s.

Definition in file charclass.hpp.