[#boost-urls-grammar-lut_chars-operator_bitnot]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::xref:boost/urls/grammar.adoc[grammar]::xref:boost/urls/grammar/lut_chars.adoc[lut&lowbar;chars]::operator&#126;
:relfileprefix: ../../../../
:mrdocs:

Return a new character set which is the complement of another character set&period;

== Synopsis

Declared in `&lt;https://www.github.com/boostorg/url/blob/develop/include/boost/url/grammar/lut_chars.hpp#L372[boost&sol;url&sol;grammar&sol;lut&lowbar;chars&period;hpp]&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
constexpr
xref:boost/urls/grammar/lut_chars.adoc[lut&lowbar;chars]
operator&#126;() const noexcept;
----

== Description

This function returns a new character set which contains all of the characters that are not in `&ast;this`&period;

== Example
This statement declares a character set containing everything but vowels&colon;

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

== Exception Safety
Throws nothing&period;

== Return Value

The new character set&period;


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