protected virtual member function


single character (1)
            bool do_is (mask m, char_type c) const;
sequence (2)
const char_type* do_is (const char_type* low,                        const char_type* high, mask* vec) const;
Classify characters [virtual]
Virtual protected member function called by ctype::is to classify characters.

Polymorphic derived classes can overwrite the behavior of this function.

See ctype::is for its default behavior in ctype.

The char specialization of ctype (ctype<char>) does not have this member, as its member ctype<char>::is returns its results directly.

See also