[#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_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#L371[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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