boost::urls::grammar::operator-

Return a new character set by subtracting

Synopsis

Declared in <boost/url/grammar/lut_chars.hpp>

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

Description

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.

Return Value

The new character set.

Parameters

Name Description

cs0

A character set to join.

cs1

A character set to join.

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