operator-

Return a new character set by subtracting


                lut_chars
operator-(
    const lut_chars& cs0,
    const lut_chars& cs1) noexcept;

Declared in file <boost/url/grammar/lut_chars.hpp> at line 328

This function returns a new character set which is formed from all of the characters in `cs0` which are not in `cs`.

This statement declares a character set containing all the lowercase letters which are not vowels:


constexpr lut_chars consonants = lut_chars("abcdefghijklmnopqrstuvwxyz") - "aeiou";

Constant.