[#boost-urls-grammar-lut_chars-operator_bitnot]
= xref:boost/urls/grammar/lut_chars/operator_bitnot.adoc[boost::urls::grammar::lut_chars::operator~]
:relfileprefix: ../../../../
:mrdocs:

Return a new character set which is the complement of another character set.

== Synopsis

Declared in `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/grammar/lut_chars.hpp#L372[boost/url/grammar/lut_chars.hpp]>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
constexpr
xref:boost/urls/grammar/lut_chars.adoc[lut_chars]
operator~() const noexcept;
----

== Description

This function returns a new character set which contains all of the characters that are not in `*this`.

== Example
This statement declares a character set containing everything but vowels:

[,cpp]
----
constexpr lut_chars not_vowels = ~lut_chars( "AEIOU" "aeiou" );
----
== Complexity
Constant.

== Exception Safety
Throws nothing.

== Return Value

The new character set.


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