In the following member descriptions, for unsigned char values v where v >= table_size, table()[v] is assumed to have an implementation-specific value (possibly different for each such value v) without performing the array lookup.
explicit ctype(const mask* tbl = 0, bool del = false,
size_t refs = 0);
Requires: tbl either 0 or an array of at least table_size elements.
Effects: Passes its refs argument to its base class constructor.
bool is(mask m, char c) const;
const char* is(const char* low, const char* high,
mask* vec) const;
Effects: The second form, for all *p in the range [low,high), assigns into vec[p-low] the value table()[ (unsigned char)*p].
Returns: The first form returns table()[(unsigned char)c] & m; the second form returns high.
const char* scan_is(mask m,
const char* low, const char* high) const;
Returns: The smallest p in the range [low,high) such that
table()[(unsigned char) *p] & m
is true.
const char* scan_not(mask m,
const char* low, const char* high) const;
Returns: The smallest p in the range [low,high) such that
table()[(unsigned char) *p] & m
is false.
char toupper(char c) const;
const char* toupper(char* low, const char* high) const;
Returns: do_toupper(c) or do_toupper(low,high), respectively.
char tolower(char c) const;
const char* tolower(char* low, const char* high) const;
Returns: do_tolower(c) or do_tolower(low,high), respectively.
char widen(char c) const;
const char* widen(const char* low, const char* high,
char* to) const;
char narrow(char c, char dfault) const;
const char* narrow(const char* low, const char* high,
char dfault, char* to) const;
const mask* table() const noexcept;
Returns: The first constructor argument, if it was non-zero, otherwise classic_table().