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[#CDD7E910AB63DFF4DF5E304F3C5B82E49FBC37E2]

= Function lut_chars::operator~

pass:v,q[Return a new character set which is the complement of another character set.]


== Synopsis

Declared in header `</boost/url/grammar/lut_chars.hpp#L363[boost/url/grammar/lut_chars.hpp,window=blank_]>`

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

== Description

pass:v,q[This function returns a new character] pass:v,q[set which contains all of the characters]
pass:v,q[that are not in `*this`.]

=== Example
pass:v,q[This statement declares a character set]
pass:v,q[containing everything but vowels:]
[,cpp]
----
constexpr lut_chars not_vowels = ~lut_chars( "AEIOU" "aeiou" );
----

=== Complexity
pass:v,q[Constant.]

=== Exception Safety
pass:v,q[Throws nothing.]



== Return Value

* `lut_chars`